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Coatings
Special Issues
Surface Treatment for Metals and Alloys
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Surface Treatment for Metals and Alloys

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 January 2024) | Viewed by 4065

Special Issue Editors

Prof. Dr. Zakaria Boumerzoug

E-Mail Website
Guest Editor
Department of Mechanical Engineering, University Mohamed Khider of Biskra, Biskra 07000, Algeria
Interests: costing; phase transformation; creep test; welding; wire drawing process; casting process
Special Issues, Collections and Topics in MDPI journals
Dr. Jana Abou-Ziki

E-Mail Website
Guest Editor
Department of Mechanical and Manufacturing Engineering, Ontario Tech University, Oshawa, ON L1G 0C5, Canada
Interests: microfluidic devices; surface functionalization; advanced manufacturing; spark assisted chemical engraving (SACE); hybrid additive-subtractive micro-manufacturing

Special Issue Information

Dear Colleagues,

The purpose of surface treatments is to modify the appearance of a surface, its physical and/or chemical properties, in order to improve resistance to corrosion, wear and oxidation, as well as to promote solderability and electrical conductivity, to modify the optical properties, to provide a thermal barrier or radiation insulation effect or even to prepare the application of a coating. The topics of interest for this this Special Issue are:

Wet deposition (Example: Deposits by immersion in molten metals: galvanizing, tinning, etc.);

Dry deposition (Example: CVD, PVD, etc.);

Conversion treatments (Example: Anodic oxidation of aluminum and titanium alloys,);

Thermochemical treatments(Example: carbonitriding, nitriding,);

Structural transformation treatments (Example: hardening treatments by quenching, etc).

Prof. Dr. Zakaria Boumerzoug
Dr. Jana Abou-Ziki
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

  • corrosion
  • wear
  • oxidation
  • conversion treatments
  • dry deposition

Published Papers (3 papers)

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Research

17 pages, 6937 KiB  
Article
Multi-Perspective Evaluations of Laser-Removal Quality of Acrylic Polyurethane Coatings on Aluminum Alloy Substrate
by Xin Huang, Yizhou Shen, Zhaoru He, Jie Tao, Song Shu, Weibiao Xiong and Zhicong Shen
Coatings 2023, 13(2), 359; https://doi.org/10.3390/coatings13020359 - 4 Feb 2023
Cited by 2 | Viewed by 1431
Abstract
Evaluation systems for objects after laser removal have not been systematically established, yet they have great significance for repairing engineering coating materials. In general, this paper mainly focused on the surface quality after laser removal, which was simulated by thermal models and characterized [...] Read more.
Evaluation systems for objects after laser removal have not been systematically established, yet they have great significance for repairing engineering coating materials. In general, this paper mainly focused on the surface quality after laser removal, which was simulated by thermal models and characterized by microscopic, residual chemical compositions, and wettability. The laser removal threshold was considered to be a key indicator to regulate removal precision. Here, the thermal model was used to explore the threshold was 15 J/cm2, and the ablation P was 308 W at 100 kHz. Besides, the surface structure was observed through simulation before experiments. It also predicted the effect of laser power and overlapping on surface roughness, and therefore provided the theoretical reference for experiments. Then, two groups of samples were set up of the surface of acrylic polyurethane coatings on 2024 aluminum alloy with and without anodizing treatment, respectively. After the coatings were removed, microscopic morphologies demonstrated a wavy undulation structure with little residue. Meanwhile, the increments of roughness were less than 0.5 μm and the surfaces were with nice wettability. Evaluating the surface quality from the above aspects is meaningful and helpful for the non-destructive cleaning of aircraft skin coatings. Full article
(This article belongs to the Special Issue Surface Treatment for Metals and Alloys)
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12 pages, 3307 KiB  
Article
Effect of Impurities Spacing on Fatigue Strength Coefficient
by Tomasz Lipiński
Coatings 2023, 13(2), 242; https://doi.org/10.3390/coatings13020242 - 20 Jan 2023
Cited by 3 | Viewed by 1363
Abstract
The influence of impurities present in steel on fatigue strength has been the subject of research conducted for many years. Despite a large number of studies, there is no unambiguous explanation of the influence of impurities on the fatigue life of steel. The [...] Read more.
The influence of impurities present in steel on fatigue strength has been the subject of research conducted for many years. Despite a large number of studies, there is no unambiguous explanation of the influence of impurities on the fatigue life of steel. The interpretation of the results becomes more complicated as the ductility of the steel increases. For this reason, most of the research concerns low-ductility hard steels. In addition, the studies presented in the literature mostly concern laboratory conditions, which the authors of the papers have tried (with varying degrees of success) to adapt to industrial research. There are a few studies on the influence of impurities in steel on the fatigue resistance factor. The coefficient k is the result of the fatigue strength zg divided by the hardness of the steel. With its help, it is possible to determine the fatigue strength depending on the hardness of the steel. In the presented work, an attempt was made to determine the impact of impurities of different sizes and located at different distances from each other on the fatigue strength coefficient. The analysis was carried out at seven heats made in industrial conditions. Melting was carried out in electric furnaces with a capacity of 140 tons. Steel from all melts was subjected to desulfurization. Samples with a diameter of 18 mm were taken. The samples were hardened from the austenitizing temperature of 880 °C. To diversify the microstructure and mechanical properties, the steel was tempered at temperatures from 200 to 600 °C. After heat treatment, the samples were subjected to rotational bending. Based on the tests, it was found that the fatigue strength coefficient k depends on the size of the impurities and the distance between the inclusions. A difference in the specific k-factors was noted depending on the microstructure of the steel. Full article
(This article belongs to the Special Issue Surface Treatment for Metals and Alloys)
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12 pages, 21232 KiB  
Article
On Variable Scale Evolution of Stress and Strain of TA2 Titanium Plate in Combined Hammering
by Xudong Xiao, Bolun Zhang, Dan Qiao, Yong Li, Renfeng Zhao and Pengkang Zhao
Coatings 2022, 12(12), 1974; https://doi.org/10.3390/coatings12121974 - 16 Dec 2022
Viewed by 859
Abstract
Combined peening composed of multiple peening processes or peening media is a surface treatment method for comprehensive control of the macro shape and performance of the part. Compared to combined peening, the impact kinetic energy of the combined hammering can be easier to [...] Read more.
Combined peening composed of multiple peening processes or peening media is a surface treatment method for comprehensive control of the macro shape and performance of the part. Compared to combined peening, the impact kinetic energy of the combined hammering can be easier to control over a wide range, and the hammer tool head size is larger than the shot. This paper focused on investigating the effect of combined hammering treatment, 6 mm and 14 mm tool heads with peening density 3.7 to 4.2/mm2, on the variable scale evolution of titanium TA2. Three types of contact relation between the tool head and existing dimple were proposed for impacting at the same position. The size of the dimple of combined hammering varies in width or depth direction, resulting in nest morphology composed of different size dimples. The cross-section microstructure of the test plate was observed, and the gradient changes of dislocation, slip, and grain size are smoothed by combined hammering. The change in hammer tool head size makes the target plastic deform at different depths. The hammering sequence has a significant influence on the evolution of stress and strain fields. When the tool head is first large and then small, a large compressive residual stress near the surface is introduced, about 1000 Mpa; on the contrary, the compressive residual stress distributes uniformly in the depth direction, with an affected layer depth of about 4.4 mm. The measured dimple size and residual stress verified the reliability of the simulation results. Full article
(This article belongs to the Special Issue Surface Treatment for Metals and Alloys)
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