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Coatings on Light Alloys Substrate—2nd Volume
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Coatings on Light Alloys Substrate—2nd Volume

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: closed (20 December 2023) | Viewed by 4913

Special Issue Editor

Prof. Dr. Hongxiang Li

E-Mail Website
Guest Editor
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Interests: corrosion and protection of magnesium alloys, including corrosion- and wear-resistant coatings on the magnesium alloy substrates; degradable magnesium alloys; alloy design, microstructure and properties of casting aluminum alloys; soft-magnetic Fe-based amorphous alloys
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue of “Coatings on Light Metal Substrates” focuses on the significant developments and in-depth understanding in surface engineering technology to modify and improve the surface properties of magnesium, aluminum and titanium alloys for protection in aggressive environments or enhanced functional performance. Under the premise that the substrate is light metal, the scope of contributions is as follows:

  • Improvement and breakthrough of surface engineering technology, including cold and thermal spraying, plasma spraying, surface modification by directed energy techniques, such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes, such as plating, sol–gel coating, anodization, plasma electrolytic oxidation, etc.
  • Engineering application and/or function application of metallic, inorganic, organic and composite coatings.
  • Relationships among the processing, the structure and the properties/performance of coatings; the properties/performance contain friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc.), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, enhanced multifunctional performance for environmental, energy and medical applications, etc.
  • Theory and/or simulation of the preparation, the service or the failure of coatings; the theory or simulation can substantially advance our understanding on the formation process, the structure and properties of coatings on light metal substrates.

Prof. Dr. Hongxiang Li
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. Materials is an international peer-reviewed open access semimonthly 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

  • light metal substrates
  • surface engineering technology
  • coatings
  • structure
  • properties and performance
  • engineering application

Published Papers (4 papers)

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Research

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18 pages, 25099 KiB  
Article
Corrosion and Erosion Wear Behaviors of HVOF-Sprayed Fe-Based Amorphous Coatings on Dissolvable Mg-RE Alloy Substrates
by Jun Yang, Yijiao Sun, Minwen Su, Xueming Yin, Hongxiang Li and Jishan Zhang
Materials 2023, 16(14), 5170; https://doi.org/10.3390/ma16145170 - 22 Jul 2023
Viewed by 594
Abstract
To suppress the corrosion and erosion wear of dissolvable magnesium alloy ball seats in wellbores, Fe-based amorphous coatings were deposited on dissolvable Mg-RE alloy substrates, and their microstructure, corrosion behavior, and erosion wear behavior were studied. The thickness of Fe-based amorphous coatings on [...] Read more.
To suppress the corrosion and erosion wear of dissolvable magnesium alloy ball seats in wellbores, Fe-based amorphous coatings were deposited on dissolvable Mg-RE alloy substrates, and their microstructure, corrosion behavior, and erosion wear behavior were studied. The thickness of Fe-based amorphous coatings on dissolvable Mg-RE alloy substrates can reach 1000 μm without any cracks, and their porosity and amorphous contents are 0.79% and 86.8%, respectively. Although chloride ions will damage the compactness and protective efficacy of passive films, Fe-based amorphous coatings still maintain low corrosion current density (3.31 μA/cm2) and high pitting potential (1 VSCE) in 20 wt% KCl solution. Due to their higher hardness, the erosion wear resistance of Fe-based amorphous coatings is about 4.16 times higher than that of dissolvable Mg-RE alloy substrates when the impact angle is 30°. Moreover, the erosion rates of Fe-based amorphous coatings exhibit a nonlinear relationship with the impact angle, and the erosion rate reaches the highest value when the impact angle is 60°. The erosion wear mechanisms of Fe-based AMCs vary with the impact angles, including cutting, delamination, splat fracture, and deformation wear. This work can provide effective guidance for the corrosion and wear protection of plugging tools made from dissolvable magnesium alloy. Full article
(This article belongs to the Special Issue Coatings on Light Alloys Substrate—2nd Volume)
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13 pages, 3502 KiB  
Article
Mechanical Properties and Wear Susceptibility Determined by Nanoindentation Technique of Ti13Nb13Zr Titanium Alloy after “Direct Laser Writing”
by Magdalena Jażdżewska, Beata Majkowska-Marzec, Andrzej Zieliński, Roman Ostrowski, Aleksandra Frączek, Gabriela Karwowska and Jean-Marc Olive
Materials 2023, 16(13), 4834; https://doi.org/10.3390/ma16134834 - 05 Jul 2023
Viewed by 859
Abstract
Laser treatment has often been applied to rebuild the surface layer of titanium and its alloys destined for long-term implants. Such treatment has always been associated with forming melted and re-solidified thin surface layers. The process parameters of such laser treatment can be [...] Read more.
Laser treatment has often been applied to rebuild the surface layer of titanium and its alloys destined for long-term implants. Such treatment has always been associated with forming melted and re-solidified thin surface layers. The process parameters of such laser treatment can be different, including the patterning of a surface by so-called direct writing. In this research, pulse laser treatment was performed on the Ti13Nb13Zr alloy surface, with the distance between adjacent laser paths ranging between 20 and 50 µm. The obtained periodic structures were tested to examine the effects of the scan distance on the microstructure using SEM, the roughness and chemical and phase composition using EDS and XRD, and the mechanical properties using the nanoindentation technique. After direct laser writing, the thickness of the melted layers was between 547 and 123 µm, and the surface roughness varied between 1.74 and 0.69 µm. An increase in hardness was observed after laser treatment. The highest hardness, 5.44 GPa, was obtained for the sample modified with a laser beam spacing of 50 µm. The value of the distance has been shown to be important for several properties and related to a complex microstructure of the thin surface layer close to and far from the laser path. Full article
(This article belongs to the Special Issue Coatings on Light Alloys Substrate—2nd Volume)
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20 pages, 22149 KiB  
Article
Influence of Electroless Nickel—DLC (Diamond-like Carbon) Multilayer Coating on the Mechanical Performance of the Heat-Treated AlSi10Mg Alloy Produced by Powder Bed Fusion-Laser Beam
by Gianluca Di Egidio, Carla Martini, Lorella Ceschini and Alessandro Morri
Materials 2023, 16(9), 3313; https://doi.org/10.3390/ma16093313 - 23 Apr 2023
Cited by 1 | Viewed by 1799
Abstract
This study characterizes the mechanical performance of the AlSi10Mg alloy produced by powder bed fusion-laser beam (PBF-LB) subjected to two combined cycles consisting of multilayer coating deposition (electroless nickel (Ni-P) + diamond-like carbon (DLC)) and heat treatment. In particular, the DLC deposition phase [...] Read more.
This study characterizes the mechanical performance of the AlSi10Mg alloy produced by powder bed fusion-laser beam (PBF-LB) subjected to two combined cycles consisting of multilayer coating deposition (electroless nickel (Ni-P) + diamond-like carbon (DLC)) and heat treatment. In particular, the DLC deposition phase replaces the artificial aging step in the T5 and T6 heat treatments, obtaining the following post-production cycles: (i) Ni-P + DLC deposition and (ii) rapid solution (SHTR) (10 min at 510 °C) before Ni-P + DLC deposition. Microstructural characterization shows no appreciable modifications in the morphology and dimensions of the hard Si-rich phase of the eutectic network and secondary spheroidal Si phase. However, overaging phenomena induced by DLC coating deposition and differences in elastic-plastic properties between the multilayer coating and the PBF-LB AlSi10Mg substrate lead to a reduction in tensile strength by up to 31% and a significant decrease in ductility by up to 58%. In contrast, higher resistance to crack opening thanks to improved surface hardness and residual compressive stresses of the coating and reduced defect sensitivity of the substrate increase the fatigue resistance by 54% in T5-coated alloy and 24% in T6R-coated alloy. Moreover, the coating remains well adherent to the substrate during fatigue testing, not becoming a source of fatigue cracks. Full article
(This article belongs to the Special Issue Coatings on Light Alloys Substrate—2nd Volume)
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Review

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24 pages, 6132 KiB  
Review
Polymeric Coatings for Magnesium Alloys for Biodegradable Implant Application: A Review
by G. Keerthiga, M. J. N. V. Prasad, Dandapani Vijayshankar and R. K. Singh Raman
Materials 2023, 16(13), 4700; https://doi.org/10.3390/ma16134700 - 29 Jun 2023
Cited by 3 | Viewed by 1331
Abstract
Magnesium (Mg) alloys are a very attractive material of construction for biodegradable temporary implants. However, Mg alloys suffer unacceptably rapid corrosion rates in aqueous environments, including physiological fluid, that may cause premature mechanical failure of the implant. This necessitates a biodegradable surface barrier [...] Read more.
Magnesium (Mg) alloys are a very attractive material of construction for biodegradable temporary implants. However, Mg alloys suffer unacceptably rapid corrosion rates in aqueous environments, including physiological fluid, that may cause premature mechanical failure of the implant. This necessitates a biodegradable surface barrier coating that should delay the corrosion of the implant until the fractured/damaged bone has healed. This review takes a brief account of the merits and demerits of various existing coating methodologies for the mitigation of Mg alloy corrosion. Since among the different coating approaches investigated, no single coating recipe seems to address the degradation control and functionality entirely, this review argues the need for polymer-based and biodegradable composite coatings. Full article
(This article belongs to the Special Issue Coatings on Light Alloys Substrate—2nd Volume)
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