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Coatings
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Surface Modification of Light Alloys by Protective Coatings
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Surface Modification of Light Alloys by Protective Coatings

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Characterization, Deposition and Modification".

Deadline for manuscript submissions: closed (15 April 2022) | Viewed by 12689

Special Issue Editors

Dr. Mohammadreza Daroonparvar

E-Mail Website
Guest Editor
National Center for Additive Manufacturing Excellence (NCAME), Mechanical Engineering Department, Auburn University, Auburn, AL 36849, USA
Interests: protective coatings; advanced thermal barrier coating systems; high pressure cold spray (HPCS); cold spray additive manufacturing (CSAM); hybrid additive manufacturing; thermal spray processes; high temprature oxidation; corrosion science; pitting and passivity; electrochemical impedance spectroscopy (EIS)
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Bertrand Jodoin

E-Mail Website
Guest Editor
Cold Spray Research Laboratory, University of Ottawa, Ottawa, ON, Canada
Interests: Compressible fluid mechanics/ Heat exchangers for the aeronautic sector; High performance coating development and production by Cold Gas Dynamic Spraying and Shockwave Induced Spraying; Nanocrystalline coating development and production for the aeronautic sector

Special Issue Information

Dear Colleagues,

Light alloys have received considerable interest for applications in the military, automotive, aerospace, sports, electronics, as well as biomedical industries, owing to their low density accompanied by interesting mechanical properties such as high strength-to-weight ratio. However, their wider application has been limited due to the relatively poor surface properties. Moreover, surface properties of aluminum, magnesium, and titanium light alloys can considerably influence the functional performances of these light alloys. Surface coating is an effective and economic way to protect light alloys from corrosion, wear, and oxidation. In fact, protective coatings (with high bond adhesion strength) should provide a barrier between the bare metal and the catastrophic environmental conditions. This will change the surface properties of the workpiece and should lead to the enhancement of service life of the component as well. Wide research activities have been performed to develop advanced surface engineering methods for light alloys.

The objective of this Special Issue is to present the latest experimental and theoretical developments in this field, through original research and short communication papers, and review articles from academic and industries around the world.

In particular, the topics of interest include but are not limited to:

  • Protective coatings on light alloys for biomedical applications, antibacterial/antifouling/antiviral purposes;
  • Protective coatings on light alloys for corrosion protection;
  • Protective coatings on light alloys for improvement of oxidation resistance;
  • Protective coatings on light alloys for improvement of wear resistance;
  • Protective coatings on additively manufactured light alloys.

Dr. Mohammadreza Daroonparvar
Prof. Dr. Bertrand Jodoin
Guest Editors

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

  • coatings
  • light alloys
  • oxidation
  • corrosion
  • additively manufactured light alloys
  • multifunctional coatings

Published Papers (3 papers)

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Research

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22 pages, 8690 KiB  
Article
Effect of Gas Propellant Temperature on the Microstructure, Friction, and Wear Resistance of High-Pressure Cold Sprayed Zr702 Coatings on Al6061 Alloy
by Alessandro M. Ralls, Ashish K. Kasar, Mohammadreza Daroonparvar, Arpith Siddaiah, Pankaj Kumar, Charles M. Kay, Manoranjan Misra and Pradeep L. Menezes
Coatings 2022, 12(2), 263; https://doi.org/10.3390/coatings12020263 - 16 Feb 2022
Cited by 13 | Viewed by 2482
Abstract
For the first time, Zr702 coatings were deposited onto an Al6061 alloy using a high-pressure cold spray (HPCS) system. In this work, five different N2 process gas temperatures between 700 and 1100 °C were employed to understand the formation of cold sprayed [...] Read more.
For the first time, Zr702 coatings were deposited onto an Al6061 alloy using a high-pressure cold spray (HPCS) system. In this work, five different N2 process gas temperatures between 700 and 1100 °C were employed to understand the formation of cold sprayed (CS) Zr coatings and their feasibility for enhanced wear resistance. Results indicated that the N2 processing gas temperature of about 1100 °C enabled a higher degree of particle thermal softening, which created a dense, robust, oxide- and defect-free Zr coating. Across all CS Zr coatings, there was a refinement of crystallinity, which was attributed to the severe localized plastic deformation of the powder particles. The enhanced thermal boost up zone at the inter-particle boundaries and decreased recoverable elastic strain were accountable for the inter-particle bonding of the coatings at higher process gas temperatures. The flattening ratio (ε) increased as a function of temperature, implying that there was a greater degree of plastic deformation at higher N2 gas temperatures. The microhardness readings and wear volume of the coatings were also improved as a function of process gas temperature. In this work, the wear of the Al6061 alloy substrate was mainly plowing-based, whereas the Zr CS substrates demonstrated a gradual change of abrasive to adhesive wear. From our findings, the preparation of CS Zr coatings was a feasible method of enhancing the wear resistance of Al-based alloys. Full article
(This article belongs to the Special Issue Surface Modification of Light Alloys by Protective Coatings)
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Review

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27 pages, 3803 KiB  
Review
A Comprehensive Review on Surface Modifications of Biodegradable Magnesium-Based Implant Alloy: Polymer Coatings Opportunities and Challenges
by Abbas Saberi, Hamid Reza Bakhsheshi-Rad, Somayeh Abazari, Ahmad Fauzi Ismail, Safian Sharif, Seeram Ramakrishna, Mohammadreza Daroonparvar and Filippo Berto
Coatings 2021, 11(7), 747; https://doi.org/10.3390/coatings11070747 - 22 Jun 2021
Cited by 50 | Viewed by 5299
Abstract
The development of biodegradable implants is certainly intriguing, and magnesium and its alloys are considered significant among the various biodegradable materials. Nevertheless, the fast degradation, the generation of a significant amount of hydrogen gas, and the escalation in the pH value of the [...] Read more.
The development of biodegradable implants is certainly intriguing, and magnesium and its alloys are considered significant among the various biodegradable materials. Nevertheless, the fast degradation, the generation of a significant amount of hydrogen gas, and the escalation in the pH value of the body solution are significant barriers to their use as an implant material. The appropriate approach is able to solve this issue, resulting in a decrease the rate of Mg degradation, which can be accomplished by alloying, surface adjustment, and mechanical treatment. Surface modification is a practical option because it not only improves corrosion resistance but also prepares a treated surface to improve bone regeneration and cell attachment. Metal coatings, ceramic coatings, and permanent polymers were shown to minimize degradation rates, but inflammation and foreign body responses were also suggested. In contrast to permanent materials, the bioabsorbable polymers normally show the desired biocompatibility. In order to improve the performance of drugs, they are generally encapsulated in biodegradable polymers. This study summarized the most recent advancements in manufacturing polymeric coatings on Mg alloys. The related corrosion resistance enhancement strategies and future potentials are discussed. Ultimately, the major challenges and difficulties are presented with aim of the development of polymer-coated Mg-based implant materials. Full article
(This article belongs to the Special Issue Surface Modification of Light Alloys by Protective Coatings)
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21 pages, 2815 KiB  
Review
Influences of Growth Species and Inclusions on the Current–Voltage Behavior of Plasma Electrolytic Oxidation: A Review
by Dah-Shyang Tsai and Chen-Chia Chou
Coatings 2021, 11(3), 270; https://doi.org/10.3390/coatings11030270 - 25 Feb 2021
Cited by 13 | Viewed by 2280
Abstract
Plasma electrolytic oxidation (PEO) has attracted increasing attention since the transportation industry adopts more lightweight metal components and requires an improved version of anodizing for surface protection. In response to the demand, researchers enrich the technical connotation of PEO through diversifying the growth [...] Read more.
Plasma electrolytic oxidation (PEO) has attracted increasing attention since the transportation industry adopts more lightweight metal components and requires an improved version of anodizing for surface protection. In response to the demand, researchers enrich the technical connotation of PEO through diversifying the growth paths and adopting new precursors. Foreign electrolyte additives, involving ceramic and polymeric particles, organic dye emulsions, are incorporated to accomplish various goals. On the other hand, significant progress has been made on comprehension of softening sparks; denoting the adverse trend of growing discharge intensity can be re-routed by involving cathodic current. I–V response shows the cathodic pulse current not only cools down the ensuing anodic pulse, but also twists the coating conductivity, and the residuals of twists accumulate over a long time frame, plausibly through oxide protonation. Thus, the cathodic current provides a tool to control the discharge intensity via integration of the coating conductivity deviations. So far, these cathodic current studies have been performed in the electrolytes of KOH and Na2SiO3. When exotic additives are included, for example Cr2O3, the cathodic current effect is also shifted, as manifested in remarkable changes in its current–voltage (I–V) behavior. We anticipate the future study on cathodic current influences of inclusion shall lead to a precise control of micro arc. Full article
(This article belongs to the Special Issue Surface Modification of Light Alloys by Protective Coatings)
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