Advances in Corrosion Resistant Coatings

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Corrosion, Wear and Erosion".

Deadline for manuscript submissions: closed (28 February 2024) | Viewed by 30340

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Department of Mechanical Engineering, California State Polytechnic University, Pomona, CA 91768, USA
Interests: nanotechnology; materials processing; manufacturing; mechanical design
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Dear Colleagues,

Corrosion-resistant coatings have the important characteristics of high chemical inertness, large heat resistance, good mechanical strength, and enhanced toughness. Recently, considerable progress has been made in the development of various coatings for the protection of materials’ exposure to aggressive corrosive media such as seawater, biofluids, and high-temperature gases. Advanced composite material coatings containing nanoparticles and nanotubes, new conversion coatings, and novel plasma coatings are some examples. Coating technology has also advanced to a new level. This can be seen from the recent developments in using novel electrochemical and chemical conversion approaches, sol-gel methods, plasma-enhanced growth, laser peening, etc. Exploring new coating materials including alloys, polymers, ceramics, composites, and nanostructured materials leads to the discovery of multifunctional coatings for applications in civil structures, machinery, and bio-implants.

This scope of this Special Issue will include, but is not limited to, the following fundamental and applied research topics:

  • Corrosion-resistant coatings for implants;
  • Seawater-corrosion-resistant coatings for petroleum engineering applications;
  • Research developments in new organic, inorganic, and composite coatings;
  • Coating technology and processes: sol-gel, hydrothermal, laser, plasma, thermal spray, electroplating, chemical deposition, physical vapor deposition, chemical vapor deposition, chromating, fluorozirconating, fluorotitanating, phosphating, bluing, black oxide coating formation, anodizing, etc.;
  • High-performance Ni–P coatings, high-temperature-resistant coatings, protective coatings in ionic fluids;
  • Corrosion mechanisms in actual or simulated biofluids;
  • Test methods for determining the corrosion of coatings in various electrolytes;
  • Modeling and simulation of coating processing and corrosion;
  • Nanostructured composite coatings and corrosion characterization.

Prof. Dr. Yong X. Gan
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • corrosion-resistant coatings
  • polymer, ceramic, alloy, and composite coatings
  • nanostructured coatings modeling and simulation
  • coating processes
  • corrosion mechanisms of coatings

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Published Papers (16 papers)

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Editorial

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4 pages, 185 KiB  
Editorial
A Brief Summary of Publications in the Special Issue: Advances in Corrosion Resistant Coatings
by Yong X. Gan
Coatings 2022, 12(7), 996; https://doi.org/10.3390/coatings12070996 - 15 Jul 2022
Viewed by 1024
Abstract
This Special Issue, “Advances in Corrosion-Resistant Coatings”, is situated in the section “Corrosion, Wear and Erosion” in the Coatings journal (ISSN 2079-6412) [...] Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)

Research

Jump to: Editorial, Review

11 pages, 23726 KiB  
Article
Microstructure, Wear Resistance and Corrosion Resistance of CrN Coating with Platinum-Iridium Co-Doping
by Di Yang, Feng Yan, Weilun Zhang and Zhiwen Xie
Coatings 2024, 14(2), 238; https://doi.org/10.3390/coatings14020238 - 18 Feb 2024
Cited by 1 | Viewed by 930
Abstract
A novel Pt-Ir co-doping strategy was devised to enhance the corrosion resistance of CrN coating. The deposited CrN coating exhibits a coherent growth pattern, resulting in significant mechanical strength and large grain sizes. However, during the corrosion process, corrosive fluids infiltrate through growth [...] Read more.
A novel Pt-Ir co-doping strategy was devised to enhance the corrosion resistance of CrN coating. The deposited CrN coating exhibits a coherent growth pattern, resulting in significant mechanical strength and large grain sizes. However, during the corrosion process, corrosive fluids infiltrate through growth defects, leading to inadequate corrosion resistance of the coating. By incorporating Pt-Ir atoms as dopants, coherent grain growth is effectively hindered, yielding a uniformly smooth surface. Simultaneously, localized non-coherent lattice growth occurs due to co-doping in the coatings, impacting the mechanical properties of CrN-PtIr coatings and causing multidirectional fracture. Nevertheless, this dense coating surface impedes the penetration of corrosive fluids and enhances the corrosion resistance of the coating to some extent. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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19 pages, 24684 KiB  
Article
Corrosion Protection Mechanism Study of Nitrite-Modified CaAl-LDH in Epoxy Coatings
by Junhao Xue, Jingjing Wang, Yanhui Cao, Xinyue Zhang, Lili Zhang, Kaifeng Chen and Congshu Huang
Coatings 2023, 13(7), 1166; https://doi.org/10.3390/coatings13071166 - 27 Jun 2023
Viewed by 1327
Abstract
In this work, nitrite and molybdate-modified CaAl layered double hydroxide(CaAl-LDH) was first synthesized, and the corrosion protection mechanism of CaAl-LDH intercalated with nitrites in epoxy coatings was investigated. Scanning electronic microscopy (SEM) and the energy dispersive spectroscopy (EDS) was used to characterize the [...] Read more.
In this work, nitrite and molybdate-modified CaAl layered double hydroxide(CaAl-LDH) was first synthesized, and the corrosion protection mechanism of CaAl-LDH intercalated with nitrites in epoxy coatings was investigated. Scanning electronic microscopy (SEM) and the energy dispersive spectroscopy (EDS) was used to characterize the morphology and element composition of the synthesized powder. Fourier transform infrared spectroscopy (FTIR) was used to characterize the information of chemical composition, and X-ray diffraction (XRD) was used to analyze the structure. The SEM and XRD results indicated that the LDH structure was destroyed in the molybdate modification process, and CaMoO4 precipitates were formed. Therefore, molybdates cannot be used to be loaded in CaAl-LDH interlayer space for synthesis of an active corrosion inhibition container. The nitrite release curve and the chloride concentration decreasing curve were measured to study the anion-exchange reaction by UV-Vis spectroscopy and a home-made Ag/AgCl probe, respectively. The corrosion protection effect of the CaAl-LDH loaded with nitrites towards the carbon steel was evaluated in 0.02 M NaCl solution by electrochemical impedance spectroscopy (EIS). Then the powder was added in the epoxy coating with 2% addition (weight vs. epoxy resin). The coating morphology and roughness were evaluated by SEM and laser microscopy, and the corrosion protection effect was investigated by EIS in an immersion period of 21 d. The fitted coating resistance of the sample with 2% LDH intercalated with nitrites was one order of magnitude higher than that with 2% LDH, and the latter one was two orders of magnitude higher than the blank sample. Local electrochemical impedance spectra (LEIS) was used to characterize the corrosion development process in micro-corrosion sites. The corrosion product of the scratched area after salt spray exposure was analyzed by EDS and Raman spectroscopy. The corrosion protection mechanism of the CaAl-LDH loaded with nitrites was proposed based on the above experimental results. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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12 pages, 3090 KiB  
Article
Study of Structural, Mechanical, and Corrosion Resistance of a Nanocomposite CrSiN/CrN/Cr Coating Deposited on AZ31: Effects of Deposition Time
by Changqing Cui and Chunyan Yang
Coatings 2023, 13(4), 678; https://doi.org/10.3390/coatings13040678 - 26 Mar 2023
Cited by 2 | Viewed by 1237
Abstract
To improve the surface properties of Mg alloys and expand the applications of CrN-based materials, composite CrSiN coatings consisting of amorphous Si3N4 and nano CrN phases have been prepared on AZ31 based on the theory of fine grain strengthening and [...] Read more.
To improve the surface properties of Mg alloys and expand the applications of CrN-based materials, composite CrSiN coatings consisting of amorphous Si3N4 and nano CrN phases have been prepared on AZ31 based on the theory of fine grain strengthening and multigrain boundaries. The effect of the thickness of the coating on the structure and properties was investigated. The microstructure was studied by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The mechanical properties, adhesion properties, and corrosion resistance were investigated using a nanoindentater, scratch testers, and electrochemical workstations. The results show that the coating consists of a face-centered cubic CrN phase, that Si3N4 is not found in the diffraction pattern, and that the HRTEM images show a composite structure of amorphous and nanocrystalline phases. With the increase in deposition time (thickness), the surface roughness decreases, the defects disappear, and the interface has no visible defects. Moreover, the hardness and elastic modulus of the coating increase, corrosion resistance improves, adhesion performance first increases and then decreases. The adhesion between coating and substrate reaches the maximum when sputtering time is 50 min, which corresponds to the CrSiN thickness of 0.79 μm. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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28 pages, 10443 KiB  
Article
Corrosion, Wear, and Antibacterial Behaviors of Hydroxyapatite/MgO Composite PEO Coatings on AZ31 Mg Alloy by Incorporation of TiO2 Nanoparticles
by Hanane Mozafarnia, Arash Fattah-Alhosseini, Razieh Chaharmahali, Meisam Nouri, Mohsen K. Keshavarz and Mosab Kaseem
Coatings 2022, 12(12), 1967; https://doi.org/10.3390/coatings12121967 - 15 Dec 2022
Cited by 23 | Viewed by 1830
Abstract
Plasma electrolytic oxidation (PEO) is a promising surface treatment for generating a thick, adherent coating on valve metals using an environmentally friendly alkaline electrolyte. In this study, the PEO method was used to modify the surface of AZ31 Mg alloy. The composite coatings [...] Read more.
Plasma electrolytic oxidation (PEO) is a promising surface treatment for generating a thick, adherent coating on valve metals using an environmentally friendly alkaline electrolyte. In this study, the PEO method was used to modify the surface of AZ31 Mg alloy. The composite coatings were formed in a phosphate-based electrolyte containing hydroxyapatite nanoparticles (NPs) and different concentrations (1, 2, 3, and 4 g/L) of TiO2 NPs. The results showed that the incorporation of TiO2 NPs in the composite coatings increased the porosity, coating thickness, surface roughness, and surface wettability of the coatings. The corrosion-resistance results of coatings in simulated body fluid (SBF) were tested for up to 72 h and all coatings showed superior corrosion resistance compared to the bare substrate. Among samples containing TiO2, the sample containing 1 g/L TiO2 had the highest inner layer resistance (0.51 kΩ·cm2) and outer resistance (285 kΩ·cm2) and the lowest average friction coefficient (395.5), so it had the best wear and corrosion resistance performance. The antibacterial tests showed that the higher the concentration of TiO2 NPs, the lower the adhesion of bacteria, resulting in enhanced antibacterial properties against S. aureus. The addition of 4 g/L of TiO2 NPs to the electrolyte provided an antibacterial rate of 97.65% for the coating. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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21 pages, 3455 KiB  
Article
Study on the Corrosion Resistance of Laser Clad Al0.7FeCoCrNiCux High-Entropy Alloy Coating in Marine Environment
by Xuehong Wu and Yanjun Lu
Coatings 2022, 12(12), 1855; https://doi.org/10.3390/coatings12121855 - 30 Nov 2022
Cited by 4 | Viewed by 1567
Abstract
In the marine atmosphere, the corrosion rate of ship components is 4–5 times higher than that of the inland atmosphere. To solve the serious corrosion problem arising from long-term service in the marine environment of naval aircraft and ships, etc., this paper takes [...] Read more.
In the marine atmosphere, the corrosion rate of ship components is 4–5 times higher than that of the inland atmosphere. To solve the serious corrosion problem arising from long-term service in the marine environment of naval aircraft and ships, etc., this paper takes Al0.7FeCoCrNiCux system high-entropy alloy coating prepared by laser melting technology with 5083 aluminum alloys as the base material and analyzes the aging and failure mode of equipment coating under a marine atmospheric environment. XRD and SEM were utilized to study the microscopic morphological structure of the coatings. The laws of influence of Cu elements on the electrochemical corrosion behavior of the Al0.7FeCoCrNiCux system high-entropy alloy in 3.5 wt.% NaCl neutral solution was investigated by using dynamic potential polarization and electrochemical impedance spectroscopy, and neutral salt spray acceleration tests and outdoor atmospheric exposure tests were carried out. The results show that the Al0.7FeCoCrNiCux (x = 0) high-entropy alloy coating has a single BCC phase structure and the Al0.7FeCoCrNiCux (x = 0.30, 0.60, 0.80, 1.00) high-entropy alloy coating consists of both BCC and FCC phases with a typical dendrite morphology. With the increase in Cu content, the self-corrosion potential of Al0.7FeCoCrNiCux gradually increases and the current density gradually decreases, which with the results of the electrochemical impedance spectrum analysis, indicating that the corrosion resistance of Al0.7FeCoCrNiCu1.00 is optimal. The results of the neutral salt spray acceleration test and the outdoor atmospheric exposure test were integrated to conduct a comprehensive evaluation of the corrosion resistance of the coating. The corrosion resistance of Al0.7FeCoCrNiCux coating increases with the increase in Cu content, and the impressive strength and plastic deformation are best when x = 0.80. Neutral salt spray accelerated the test with no corrosion at 5040 h, and even if the coating is broken, it can last up to 4320 h. In the outdoor atmospheric exposure test, which was conducted 12 months after the coating surface test, no corrosion occurred. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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12 pages, 3920 KiB  
Article
Oxidative Corrosion Mechanism of Ti2AlNb-Based Alloys during Alternate High Temperature-Salt Spray Exposure
by Wei Chen, Lei Huang, Yaoyao Liu, Yanfei Zhao, Zhe Wang and Zhiwen Xie
Coatings 2022, 12(10), 1374; https://doi.org/10.3390/coatings12101374 - 20 Sep 2022
Cited by 2 | Viewed by 1244
Abstract
This study investigates the corrosion damage mechanisms of Ti2AlNb-based alloys under high temperature, salt spray and coupled high temperature-salt spray conditions. This alloy was analysed in detail from macroscopic to microscopic by means of microscale detection (XRD, SEM and EDS). The [...] Read more.
This study investigates the corrosion damage mechanisms of Ti2AlNb-based alloys under high temperature, salt spray and coupled high temperature-salt spray conditions. This alloy was analysed in detail from macroscopic to microscopic by means of microscale detection (XRD, SEM and EDS). The results indicated that Ti2AlNb-based alloy surface oxide layer is dense and complete, and the thickness is only 3 µm after oxidation at 650 °C for 400 h. Compared to the original sample, the production of the passivation film resulted in almost no damage to Ti2AlNb-based alloy after 50 cycles of salt spray testing at room temperature. The tests showed that Ti2AlNb alloy shows good erosion resistance at 650 °C and in salt spray. However, this alloy had an oxide layer thickness of up to 30 µm and obvious corrosion pits on the surface after 50 cycles of corrosion under alternating high temperature-salt spray conditions. The Cl2 produced by the mixed salt eutectic reaction acted as a catalytic carrier to accelerate the volatilisation of the chloride inside the oxide layer and the re-oxidation of the substrate. In addition, the growth of unprotected corrosion products (Na2TiO3, NaNbO3 and AlNbO4) altered the internal structure of the oxide layer, destroying the surface densification and causing severe damage to the alloy surface. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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13 pages, 5164 KiB  
Article
Investigation on Influencing Mechanism of Processing Parameters on Corrosion Resistance and Zinc Content of Anodic Coatings Developed on Magnesium Alloys in Near-Neutral Solutions
by Wenxia Zhang, Yuanyuan Zhu, Rongfang Zhao, Shufang Zhang, Xinying Lai, Yibo Wang, Zekun Yan, Wenjing Liu and Rongfa Zhang
Coatings 2022, 12(9), 1286; https://doi.org/10.3390/coatings12091286 - 2 Sep 2022
Cited by 1 | Viewed by 1130
Abstract
In near-neutral solutions, the effects of NH4HF2, H3PO4, phytic acid (IP6), and EDTA-ZnNa2 concentration on corrosion resistance and the Zn amount of micro-arc oxidation (MAO) coatings were revealed by an orthogonal experiment. The influencing [...] Read more.
In near-neutral solutions, the effects of NH4HF2, H3PO4, phytic acid (IP6), and EDTA-ZnNa2 concentration on corrosion resistance and the Zn amount of micro-arc oxidation (MAO) coatings were revealed by an orthogonal experiment. The influencing order of four factors on coating corrosion resistance is EDTA-ZnNa2 > NH4HF2 > IP6 > H3PO4, while the sequence on the Zn amount is ranked as EDTA-ZnNa2 > NH4HF2 > H3PO4 > IP6. The fabricated Zn-containing coatings exhibit excellent corrosion resistance, and their icorr values are two orders of magnitude lower than that of the WE43 substrate, while the highest Zn amount achieves 4.12 wt.%. P and F compete to take part in coating formation, and Zn ions enter into anodic coatings by diffusion. Coating corrosion resistance is jointly determined by surface characteristics, which will provide the important theoretical foundation for fabricating Zn-containing coating with high corrosion resistance. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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11 pages, 4458 KiB  
Article
Understanding the Role of a Cr Transition Layer in the Hot-Salt Corrosion Behavior of an AlSi Alloy Coating
by Tianxin Liu, Wei Chen, Suying Hu, Lin Xiang, Xu Gao and Zhiwen Xie
Coatings 2022, 12(8), 1167; https://doi.org/10.3390/coatings12081167 - 12 Aug 2022
Viewed by 1228
Abstract
The effect of a chromium (Cr) transition layer on the hot-salt corrosion behavior of an AlSi alloy coating was studied. Hot-salt corrosion experiments were performed at 650 °C and corrosion kinetic curves were plotted. The weight gain of the AlSi-coated samples increased to [...] Read more.
The effect of a chromium (Cr) transition layer on the hot-salt corrosion behavior of an AlSi alloy coating was studied. Hot-salt corrosion experiments were performed at 650 °C and corrosion kinetic curves were plotted. The weight gain of the AlSi-coated samples increased to 0.89 mg/cm2 at 100 h and then decreased steadily to 0.77 mg/cm2 at 200 h. The weight of the AlSi-coated samples with the addition of a Cr transition layer increased immediately to 0.79 mg/cm2 at 20 h and then gradually increased to 0.85 mg/cm2 at 200 h. This Cr diffusion promoted the preferential creation of an Al2O3 layer, which effectively hindered the upward diffusion of Fe and also resulted in the production of a Cr2O3-SiO2 layer, which impeded the multi-scale salt mixture’s penetration. The Cr diffusion also caused a notable seal-healing effect, which healed the micro-pores. These oxidation and degradation reactions were considerably repressed by the high barrier properties of these oxide layers and the dense surface, resulting in the increased hot-salt corrosion resistance of the AlSi alloy coating. The current findings provide a feasible strategy for the design of a diffusion barrier layer of a thermal protective coating on martensitic stainless steel. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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10 pages, 3927 KiB  
Communication
Microstructure and Corrosion Resistance of an HVAF-Sprayed Al-Based Amorphous Coating on Magnesium Alloys
by Shu Wen, Xiaoming Wang and Zhiqiang Ren
Coatings 2022, 12(4), 425; https://doi.org/10.3390/coatings12040425 - 23 Mar 2022
Cited by 7 | Viewed by 1664
Abstract
An Al86Ni6Y4.5Co2La1.5 amorphous coating was prepared on a ZM5 magnesium alloys substrate by using high-velocity air fuel (HVAF) spray. The coating contained a 75.8% amorphous phase (volume fraction) in addition to the crystallization phases [...] Read more.
An Al86Ni6Y4.5Co2La1.5 amorphous coating was prepared on a ZM5 magnesium alloys substrate by using high-velocity air fuel (HVAF) spray. The coating contained a 75.8% amorphous phase (volume fraction) in addition to the crystallization phases of α-Al, Al4NiY, and Al9Ni5Y3. The microhardness reached 420 HV0.05 for the coating. The coating could endure 500 h neutral salt spray tests without apparent corrosion. Moreover, the coating exhibited a much nobler corrosion potential and two orders of magnitude smaller corrosion current density compared to the substrate. These improvements can be attributed to the compact coating structure and the passive film formed during corrosion. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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23 pages, 8578 KiB  
Article
Electrochemical Corrosion of Titanium and Titanium Alloys Anodized in H2SO4 and H3PO4 Solutions
by Jesús Manuel Jáquez-Muñoz, Citlalli Gaona-Tiburcio, José Chacón-Nava, Jose Cabral-Miramontes, Demetrio Nieves-Mendoza, Erick Maldonado-Bandala, Anabel D. Delgado, Juan Pablo Flores-De los Rios, Patrizia Bocchetta and Facundo Almeraya-Calderón
Coatings 2022, 12(3), 325; https://doi.org/10.3390/coatings12030325 - 1 Mar 2022
Cited by 18 | Viewed by 4292
Abstract
Titanium and its alloys have superior electrochemical properties compared to other alloy systems due to the formation of a protective TiO2 film on metal surfaces. The ability to generate the protective oxide layer will depend upon the type of alloy to be [...] Read more.
Titanium and its alloys have superior electrochemical properties compared to other alloy systems due to the formation of a protective TiO2 film on metal surfaces. The ability to generate the protective oxide layer will depend upon the type of alloy to be used. The aim of this work was to characterize the electrochemical corrosion behavior of titanium Ti-CP2 and alloys Ti-6Al-2Sn-4Zr-2Mo, Ti-6Al-4V, and Ti Beta-C. Samples were anodized in 1 M H2SO4 and H3PO4 solutions with a current density of 0.025 A/cm2. Electrochemical tests on anodized alloys were carried out using a three-electrode cell and exposed in two electrolytes, i.e., 3.5 wt % NaCl and 3.5 wt % H2SO4 solutions at room temperature. Scanning electron microscopy (SEM) was used to observe the morphology of anodized surfaces. The electrochemical techniques used were cyclic potentiodynamic polarization (CPP) and electrochemical noise (EN), based on the ASTM-G61 and G199 standards. Regarding EN, two methods of data analysis were used: the frequency domain (power spectral density, PSD) and time-frequency domain (discrete wavelet transform). For non-anodized alloys, the results by CCP and EN indicate icorr values of ×10−6 A/cm2. However, under anodizing conditions, the icorr values vary from ×10−7 to ×10−9 A/cm2. The PSD Ψ0 values are higher for non-anodized alloys, while in anodized conditions, the values range from −138/−122 dBi (A2·Hz−1)1/2 to −131/−180 dBi (A2·Hz−1)1/2. Furthermore, the results indicated that the alloys anodized in the H3PO4 bath showed an electrochemical behavior that can be associated with a more homogeneous passive layer when exposed to the 3.5 wt % NaCl electrolyte. Alloys containing more beta-phase stabilizers formed a less homogeneous anodized layer. These alloys are widely used in aeronautical applications; thus, it is essential that these alloys have excellent corrosion performance in chloride and acid rain environments. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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15 pages, 2096 KiB  
Article
Nanomechanical and Electrochemical Properties of ZnO-Nanoparticle-Filled Epoxy Coatings
by Ubair Abdus Samad, Mohammad Asif Alam, Arfat Anis, Hany S. Abdo, Hamid Shaikh and Saeed M. Al-Zahrani
Coatings 2022, 12(2), 282; https://doi.org/10.3390/coatings12020282 - 21 Feb 2022
Cited by 10 | Viewed by 1888
Abstract
This work focuses on the mechanical, nanomechanical, thermal, and electrochemical properties of epoxy coatings with various percentages of ZnO nanoparticles. The prepared coatings were analyzed after complete curing of 7 days. The dispersion of nanoparticles in the matrix was analyzed by Scanning Electron [...] Read more.
This work focuses on the mechanical, nanomechanical, thermal, and electrochemical properties of epoxy coatings with various percentages of ZnO nanoparticles. The prepared coatings were analyzed after complete curing of 7 days. The dispersion of nanoparticles in the matrix was analyzed by Scanning Electron Microscopy (SEM) followed by Fourier-Transformed Infrared Spectroscopy (FTIR) to evaluate the effect of the nanoparticles on curing and Differential Scanning Calorimetry (DSC) to evaluate its thermal properties. The electrochemical (anticorrosion) properties of the coatings were analyzed by exposing the prepared coatings to a 3.5% NaCl solution. The obtained results indicated that the addition of the nanoparticles was effective at lower loadings; higher loadings of the nanoparticles led to increased agglomeration because of higher particle–particle interaction. At higher nanoparticle loadings, the curing process was adversely affected, which led to lower curing percentage. The lower degree of curing affected the thermal, mechanical, and electrochemical properties. The increase in nanoparticle loading beyond 2% negatively affected the coating properties. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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24 pages, 7886 KiB  
Article
Galvanic Corrosion Behaviour of Different Types of Coatings Used in Safety Systems Manufacturing
by Diana-Petronela Burduhos-Nergis, Dumitru-Doru Burduhos-Nergis and Costica Bejinariu
Coatings 2021, 11(12), 1542; https://doi.org/10.3390/coatings11121542 - 15 Dec 2021
Cited by 6 | Viewed by 2673
Abstract
Worker safety is one of the main aspects to be taken into account in any activity carried out at work. When we talk about the safety of the worker at activities carried out at height, the condition and characteristics of the personal protective [...] Read more.
Worker safety is one of the main aspects to be taken into account in any activity carried out at work. When we talk about the safety of the worker at activities carried out at height, the condition and characteristics of the personal protective equipment against falling from a height are one of the main causes of work accidents resulting in serious injuries or death. Carabiners are the main components of the safety system; their role is to connect the other components of the system or to make the connection between the system and the anchor point. Therefore, to be used safely, the carabiners’ material must have high corrosion resistance in different environments. This paper is part of a complex study that aims to improve the corrosion properties of carbon steel used in the manufacture of carabiners. Previous studies have shown that the corrosion resistance of carbon steel in various corrosive environments has been improved by the deposition of different types of phosphate layers, as well as other subsequently deposited layers. The aim of this paper is to study the galvanic corrosion evaluation between different galvanic couples (duralumin-coated samples, aluminium bronze-coated samples, and carbon steel-coated samples) tested in three different corrosive media. Moreover, the study approaches for the first time the galvanic corrosion of systems that can be formed between the materials used in the manufacture of carabiners. Accordingly, it was observed that, overall, the samples coated with a Zn phosphate layer exhibited the best performance in all the corrosive environments (saltwater and fire extinguishing solution). Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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8 pages, 3978 KiB  
Article
Enhancing Electrical Conductivity and Corrosion Resistance of CrN Coating by Pt Addition
by Hulin Wu, Yihe Wang, Lin Xiang, Guanlin Song and Zhiwen Xie
Coatings 2021, 11(12), 1479; https://doi.org/10.3390/coatings11121479 - 1 Dec 2021
Cited by 3 | Viewed by 1965
Abstract
Transition-metal nitride coating used to protect the electronic connector devices in marine environment is required to have high electrical conductivity and good corrosion resistance. This study synthesized a novel CrN–Pt coating with a dense growth texture. Pt addition induced a pronounced increase in [...] Read more.
Transition-metal nitride coating used to protect the electronic connector devices in marine environment is required to have high electrical conductivity and good corrosion resistance. This study synthesized a novel CrN–Pt coating with a dense growth texture. Pt addition induced a pronounced increase in electrical conductivity and corrosion resistance. The resistivity decreased from 0.0149 Ohm·cm in the CrN coating to 0.000472 Ohm·cm in the CrN–Pt coating, while the corrosion current density decreased from 24 nA/cm2 in the CrN coating to 6.3 nA/cm2 in the CrN–Pt coating. The results of the above studies confirm that Pt doping has significant advantages in improving the electrical conductivity and corrosion resistance of nitride coatings for potential applications in the marine environment. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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15 pages, 4788 KiB  
Article
Corrosion Behavior of AA2055 Aluminum-Lithium Alloys Anodized in the Presence of Sulfuric Acid Solution
by Pedro Oliver Samaniego-Gámez, Facundo Almeraya-Calderon, Erick Maldonado-Bandala, Jose Cabral-Miramontes, Demetrio Nieves-Mendoza, Javier Olguin-Coca, Luis Daimir Lopez-Leon, Luis G. Silva Vidaurri, Patricia Zambrano-Robledo and Citlalli Gaona-Tiburcio
Coatings 2021, 11(11), 1278; https://doi.org/10.3390/coatings11111278 - 21 Oct 2021
Cited by 12 | Viewed by 2397
Abstract
The aim of this work was to evaluate the corrosion behavior of the AA2055 Aluminum-lithium alloy anodized in a sulfuric acid (H2SO4) bath, varying the current density of 0.19 and 1 A·cm−2 and why the sealing solution was [...] Read more.
The aim of this work was to evaluate the corrosion behavior of the AA2055 Aluminum-lithium alloy anodized in a sulfuric acid (H2SO4) bath, varying the current density of 0.19 and 1 A·cm−2 and why the sealing solution was water (H2O) and sodium dichromate (Na2Cr2O7). Anodized samples were exposed to a 10 vol.% H2SO4 solution and the electrochemical technique used was electrochemical impedance spectroscopy. Scanning electron microscopy and X-ray photoelectron spectroscopy were employed to characterization of the anodizing layer, determinate morphology and thickness of coatings. The Na2Cr2O7 sealing solution tends to increase the charge transfer resistance and produces a more homogeneous and compact passive oxide layer, and imparts a corrosion inhibition protection to the AA2055. SEM observations indicated that the morphology and thickness of the anodic films formed on AA2055 aluminum-lithium alloy anodized have the best results for both current densities. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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Review

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24 pages, 4177 KiB  
Review
A Review on the Processing Technologies for Corrosion Resistant Thermoelectric Oxide Coatings
by Yong X. Gan
Coatings 2021, 11(3), 284; https://doi.org/10.3390/coatings11030284 - 28 Feb 2021
Cited by 5 | Viewed by 2685
Abstract
Oxide coatings are corrosion resistant at elevated temperatures. They also show intensive phonon scattering and strong quantum confinement behavior. Such features allow them to be used as new materials for thermoelectric energy conversion and temperature measurement in harsh environments. This paper provides an [...] Read more.
Oxide coatings are corrosion resistant at elevated temperatures. They also show intensive phonon scattering and strong quantum confinement behavior. Such features allow them to be used as new materials for thermoelectric energy conversion and temperature measurement in harsh environments. This paper provides an overview on processing thermoelectric oxide coatings via various technologies. The first part deals with the thermoelectricity of materials. A comparison on the thermoelectric behavior between oxides and other materials will be made to show the advantages of oxide materials. In the second part of the paper, various processing technologies for thermoelectric metal oxide coatings in forms of thin film, superlattice, and nanograin powder will be presented. Vapor deposition, liquid phase deposition, nanocasting, solid state approach, and energy beam techniques will be described. The structure and thermoelectric property of the processed metal oxide coatings will be discussed. In addition, the device concept and applications of oxide coatings for thermoelectric energy conversion and temperature sensing will be mentioned. Perspectives for future research will be provided as well. Full article
(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings)
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