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Coatings
Special Issues
Hard Coatings in Research and Industry
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Hard Coatings in Research and Industry

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 11896

Special Issue Editors

Dr. Marko Sedlacek

E-Mail Website
Guest Editor
Institute of Metals and Technology, Lepi pot 11, 1000 Ljubljana, Slovenia
Interests: surface topography; coatings; surface texturing; fatigue
Special Issues, Collections and Topics in MDPI journals
Dr. Bojan Podgornik

E-Mail Website
Guest Editor
Institute of Metals and Technology, 1000 Ljubljana, Slovenia
Interests: mechanical properties of metallic materials; effect of residual stresses; fatigue, fracture and impact toughness, creep; fracture and contact mechanics; surface engineering and galling resistance; wear and friction properties of coatings and materials; 3D printing, compatibility of lubricants and surfaces
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Hard protective coatings are widely used in various industries in order to increase wear resistance, minimize friction, protect surfaces from cold welding, corrosion, etc. In various industries, hard coatings are used because they improve the quality of surface finish and increase wear resistance and protection of the tool’s cutting edge geometry, together with decreasing friction coefficient and cutting temperatures.

In particular, the topic of interest includes but is not limited to:

  • New coatings for industrial use;
  • Coatings performance in an industrial environment;
  • Quality control and wear monitoring of coated components;
  • Use of coatings in severe contact conditions;
  • Influence of coatings on fatigue properties;
  • Influence on corrosion resistance;
  • Influence of substrate properties on load bearing capacity;
  • Influence of surface defects on the coating integrity.

Dr. Marko Sedlacek
Prof. Dr. Bojan Podgornik
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.

Published Papers (2 papers)

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Research

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14 pages, 2961 KiB  
Article
Corrosion Resistance of Hard Coat Anodized AA 6061 in Citric–Sulfuric Solutions
by José Cabral-Miramontes, Citlalli Gaona-Tiburcio, Francisco Estupinán-López, María Lara-Banda, Patricia Zambrano-Robledo, Demetrio Nieves-Mendoza, Erick Maldonado-Bandala, José Chacón-Nava and Facundo Almeraya-Calderón
Coatings 2020, 10(6), 601; https://doi.org/10.3390/coatings10060601 - 26 Jun 2020
Cited by 16 | Viewed by 5366
Abstract
Aluminum is a material widely used in aeronautical and transport industries due to its excellent mechanical and corrosion resistance properties. Unfortunately, aluminum alloys are susceptible to corrosion, which limits their use in some corrosive environments. The aim of this work is to characterize [...] Read more.
Aluminum is a material widely used in aeronautical and transport industries due to its excellent mechanical and corrosion resistance properties. Unfortunately, aluminum alloys are susceptible to corrosion, which limits their use in some corrosive environments. The aim of this work is to characterize hard coat film fabricated by anodizing in a citric–sulfuric acid system using electrochemical techniques. The anodization process was carried out using an aluminum alloy AA 6061 anodization bath: a mix of citric and sulfuric acid solutions were used. For the anodizing process, two current densities were used, 1 and 7.2 A·cm−2. Anodized specimens obtained under different conditions were exposed to a 3.5 wt.% NaCl solution, and their electrochemical behavior was studied by electrochemical impedance spectroscopy (EIS) and cyclic potentiodynamic polarization (CPP) according to ASTM G106-15 and ASTM G5-13, respectively. Scanning electron microscopy (SEM) was employed to determinate the morphology and thickness of coatings. The results showed improved corrosion resistance in 6061 aluminum anodized in citric–sulfuric acid electrolyte compared to those anodized in sulfuric acid solution. Full article
(This article belongs to the Special Issue Hard Coatings in Research and Industry)
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Review

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36 pages, 7902 KiB  
Review
Recent Progress in Precision Machining and Surface Finishing of Tungsten Carbide Hard Composite Coatings
by Christian Micallef, Yuri Zhuk and Adrianus Indrat Aria
Coatings 2020, 10(8), 731; https://doi.org/10.3390/coatings10080731 - 25 Jul 2020
Cited by 14 | Viewed by 5841
Abstract
Owing to their high hardness, fracture toughness and oxidation resistance, tungsten carbide (WC) coatings are extensively deposited on parts that operate in demanding applications, necessitating wear, erosion, and corrosion resistance. The application of thick and hard WC coatings has an inevitable effect on [...] Read more.
Owing to their high hardness, fracture toughness and oxidation resistance, tungsten carbide (WC) coatings are extensively deposited on parts that operate in demanding applications, necessitating wear, erosion, and corrosion resistance. The application of thick and hard WC coatings has an inevitable effect on the original dimensions of the parts, affecting the geometrical tolerances and surface roughness. The capability of achieving a sub-micron surface finish and adhere to tight geometrical tolerances accurately and repeatably is an important requirement, particularly with components that operate in high-precision sliding motion. Meeting such requirements through conventional surface finishing methods, however, can be challenging due to the superior mechanical and tribological properties of WC coatings. A brief review into the synthesis techniques of cemented and binderless WC coatings is presented together with a comprehensive review into the available techniques which are used to surface finish WC-based coatings with reference to their fundamental mechanisms and capabilities to process parts with intricate and internal features. The binderless WC/W coating considered in this work is deposited through chemical vapour deposition (CVD) and unlike traditional cemented carbide coatings, it has a homogenous coating structure. This distinctive characteristic has the potential of eliminating key issues commonly encountered with machining and finishing of WC-based coatings. Here, six contact and non-contact surface finishing techniques, include diamond turning, precision grinding, superfinishing, vibratory polishing, electrical discharge machining, and electropolishing are discussed along with their current use in industry and limitations. Key challenges in the field are highlighted and potential directions for future investigation, particularly on binderless WC coatings, are proposed herein. Full article
(This article belongs to the Special Issue Hard Coatings in Research and Industry)
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