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Coatings
Special Issues
Surface Preparation and Treatments for Enhancing the Coating Performance
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Surface Preparation and Treatments for Enhancing the Coating Performance

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

Deadline for manuscript submissions: closed (31 January 2018) | Viewed by 11179

Special Issue Editors

Dr. Jon Iñaki Iñaki Arrizubieta

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Faculty of Engineering, University of the Basque Country (UPV/EHU), Plaza Torres Quevedo 1, Bilbao 48013, Bizkaia, Spain
Interests: laser material processing; metal additive manufacturing; laser material deposition; laser process modeling; environmental impact
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Luis Norberto López De Lacalle

E-Mail Website
Guest Editor
The Aeronautics Advanced Manufacturing Center-CFAA, 48170 Zamudio, Biscay, Spain
Interests: manufacturing process
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue on "Surface Preparation and Treatments for Enhancing Coating Performance" aims to collect and disseminate knowledge for improving the generated coatings of metallic parts. The proper coating of a surface does not only involve the deposition of a determined layer that enhances certain surface properties. In order to guarantee desired results, the surface to be coated must be prepared: Cleaned and even shaped with a specifically-designed surface pattern that ensures the correct binding of a coating to the base material, such as sand blasting or texturing. Moreover, in many cases, a post treatment must be included to guarantee the coating's desired surface properties. For example, edge rounding of cutting tools has an enormous influence on the performance of coated tools.

The coating procedure must be considered as a whole process. Nevertheless, many publications omit the above-mentioned pre- and post-treatments, and this lack of information does not allow the achievement of proper coatings. Moreover, in many cases, published papers are headed in the opposite direction from what is expected by companies, and, consequently, they are not of interest.

This Special Issue of Coatings invites manuscripts of original articles, especially those related with latest advances and innovations in surface preparations and treatments for the achievement of proper coatings. The scope of this Special Issue includes different coating treatments, where PVD (Physical Vapor Deposition), CVD (Chemical Vapor Deposition), Electrolytic Plating, thermal spray, and laser cladding are included.

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

  • Pre- and post-treatments of surfaces and their effects on coating performance
  • New coatings for space applications
  • The new nanostructured coatings: performance and applications
  • Coatings and sustainability: Elimination of coolants, disposals, etc. Benefits of the usage of coated tools in machining
  • New applications of coatings
  • Coatings on ceramic and sintered surfaces
  • Coatings and additive manufacturing, where laser cladding is included
  • The effect of residual stresses on coating performance
Dr. Arrizubieta Iñaki Arrizubieta
Prof. Dr. Luis Norberto López de Lacalle

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

12 pages, 6944 KiB  
Article
Hydrogen Permeation, and Mechanical and Tribological Behavior, of CrNx Coatings Deposited at Various Bias Voltages on IN718 by Direct Current Reactive Sputtering
by Egor B. Kashkarov, Aleksei Obrosov, Alina N. Sutygina, Elena Uludintceva, Andrei Mitrofanov and Sabine Weiß
Coatings 2018, 8(2), 66; https://doi.org/10.3390/coatings8020066 - 09 Feb 2018
Cited by 7 | Viewed by 4789
Abstract
In the current work, the microstructure, hydrogen permeability, and properties of chromium nitride (CrNx) thin films deposited on the Inconel 718 superalloy using direct current reactive sputtering are investigated. The influence of the substrate bias voltage on the crystal structure, mechanical, [...] Read more.
In the current work, the microstructure, hydrogen permeability, and properties of chromium nitride (CrNx) thin films deposited on the Inconel 718 superalloy using direct current reactive sputtering are investigated. The influence of the substrate bias voltage on the crystal structure, mechanical, and tribological properties before and after hydrogen exposure was studied. It was found that increasing the substrate bias voltage leads to densification of the coating. X-ray diffraction (XRD) results reveal a change from mixed fcc-CrN + hcp-Cr2N to the approximately stoichiometric hcp-Cr2N phase with increasing substrate bias confirmed by wavelength-dispersive X-ray spectroscopy (WDS). The texture coefficients of (113), (110), and (111) planes vary significantly with increasing substrate bias voltage. The hydrogen permeability was measured by gas-phase hydrogenation. The CrN coating deposited at 60 V with mixed c-CrN and (113) textured hcp-Cr2N phases exhibits the lowest hydrogen absorption at 873 K. It is suggested that the crystal orientation is only one parameter influencing the permeation resistance of the CrNx coating together with the film structure, the presence of mixing phases, and the packing density of the structure. After hydrogenation, the hardness increased for all coatings, which could be related to the formation of a Cr2O3 oxide film on the surface, as well as the defect formation after hydrogen loading. Tribological tests reveal that hydrogenation leads to a decrease of the friction coefficient by up to 40%. The lowest value of 0.25 ± 0.02 was reached for the CrNx coating deposited at 60 V after hydrogenation. Full article
(This article belongs to the Special Issue Surface Preparation and Treatments for Enhancing the Coating Performance)
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10 pages, 2751 KiB  
Article
Analysis of the Influence of the Use of Cutting Fluid in Hybrid Processes of Machining and Laser Metal Deposition (LMD)
by Magdalena Cortina, Jon Iñaki Arrizubieta, Eneko Ukar and Aitzol Lamikiz
Coatings 2018, 8(2), 61; https://doi.org/10.3390/coatings8020061 - 07 Feb 2018
Cited by 14 | Viewed by 5548
Abstract
Hybrid manufacturing processes that combine additive and machining operations are gaining relevance in modern industry thanks to the capability of building complex parts with minimal material and, many times, with process time reduction. Besides, as the additive and subtractive operations are carried out [...] Read more.
Hybrid manufacturing processes that combine additive and machining operations are gaining relevance in modern industry thanks to the capability of building complex parts with minimal material and, many times, with process time reduction. Besides, as the additive and subtractive operations are carried out in the same machine, without moving the part, dead times are reduced and higher accuracies are achieved. However, it is not clear whether the direct material deposition after the machining operation is possible or intermediate cleaning stages are required because of the possible presence of residual cutting fluids. Therefore, different Laser Metal Deposition (LMD) tests are performed on a part impregnated with cutting fluid, both directly and after the removal of the coolant by techniques such as laser vaporizing and air blasting. The present work studies the influence of the cutting fluid in the LMD process and the quality of the resulting part. Resulting porosity is evaluated and it is concluded that if the part surface is not properly clean after the machining operation, deficient clad quality can be obtained in the subsequent laser additive operation. Full article
(This article belongs to the Special Issue Surface Preparation and Treatments for Enhancing the Coating Performance)
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