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Special Issue "Advances in Corrosion Resistant Coatings Volume II"

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

Deadline for manuscript submissions: 30 September 2023 | Viewed by 5397

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Dr. Yong X. Gan

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Department of Mechanical Engineering, California State Polytechnic University Pomona, 3801 W Temple Avenue, Pomona, CA 91768, USA
Interests: materials; composites; carbon fiber; processing; microstructure characterization; mechanics of materials; nanotechnology
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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.

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 2200 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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Advances in Corrosion Resistant Coatings in Coatings (9 articles)

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Special Issue: Advances in Corrosion Resistant Coatings Volume II

Yong X. Gan

Coatings 2022, 12(6), 847; https://doi.org/10.3390/coatings12060847 - 17 Jun 2022

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Abstract

Among the various corrosion prevention methods as described in [...] Full article

(This article belongs to the Special Issue Advances in Corrosion Resistant Coatings Volume II)

Research

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Open AccessArticle

Study of Structural, Mechanical, and Corrosion Resistance of a Nanocomposite CrSiN/CrN/Cr Coating Deposited on AZ31: Effects of Deposition Time

Changqing Cui

and

Chunyan Yang

Coatings 2023, 13(4), 678; https://doi.org/10.3390/coatings13040678 - 26 Mar 2023

Viewed by 566

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 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 Volume II)

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Corrosion, Wear, and Antibacterial Behaviors of Hydroxyapatite/MgO Composite PEO Coatings on AZ31 Mg Alloy by Incorporation of TiO₂ Nanoparticles

Hanane Mozafarnia

Arash Fattah-Alhosseini

and

Coatings 2022, 12(12), 1967; https://doi.org/10.3390/coatings12121967 - 15 Dec 2022

Cited by 2 | Viewed by 854

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 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 Volume II)

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Open AccessArticle

Study on the Corrosion Resistance of Laser Clad Al_0.7FeCoCrNiCu_x High-Entropy Alloy Coating in Marine Environment

Xuehong Wu

and

Yanjun Lv

Coatings 2022, 12(12), 1855; https://doi.org/10.3390/coatings12121855 - 30 Nov 2022

Viewed by 644

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 Al_0.7FeCoCrNiCu_x 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 Al_0.7FeCoCrNiCu_x 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 Al_0.7FeCoCrNiCu_x (x = 0) high-entropy alloy coating has a single BCC phase structure and the Al_0.7FeCoCrNiCu_x (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 Al_0.7FeCoCrNiCu_x gradually increases and the current density gradually decreases, which with the results of the electrochemical impedance spectrum analysis, indicating that the corrosion resistance of Al_0.7FeCoCrNiCu_1.00 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 Al_0.7FeCoCrNiCu_x 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 Volume II)

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Open AccessArticle

Oxidative Corrosion Mechanism of Ti₂AlNb-Based Alloys during Alternate High Temperature-Salt Spray Exposure

and

Coatings 2022, 12(10), 1374; https://doi.org/10.3390/coatings12101374 - 20 Sep 2022

Viewed by 650

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 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 Volume II)

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Investigation on Influencing Mechanism of Processing Parameters on Corrosion Resistance and Zinc Content of Anodic Coatings Developed on Magnesium Alloys in Near-Neutral Solutions

and

Coatings 2022, 12(9), 1286; https://doi.org/10.3390/coatings12091286 - 02 Sep 2022

Viewed by 662

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 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 i_corr 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 Volume II)

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Open AccessArticle

Understanding the Role of a Cr Transition Layer in the Hot-Salt Corrosion Behavior of an AlSi Alloy Coating

and

Coatings 2022, 12(8), 1167; https://doi.org/10.3390/coatings12081167 - 12 Aug 2022

Viewed by 709

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 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 Volume II)

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