Effect of hydrogen embrittlement on mechanical characteristics of DLC-coating for hydrogen valves of FCEVs

Diamond-like carbon (DLC) coating is a surface coating technology with excellent hydrogen permeation resistance and wear resistance. However, it is difficult to completely prevent hydrogen permeation, and when hydrogen penetrates into the coating layer, the DLC coating is adversely affected. Therefo...

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Bibliographic Details
Published in:Npj Materials degradation 2024-05, Vol.8 (1), p.47-15, Article 47
Main Authors: Shin, Dong-Ho, Kim, Seong-Jong
Format: Article
Language:English
Subjects:
639/166/988
639/301/119/544
Adhesive strength
Blistering
Buffer layers
Chemistry and Materials Science
Coating
Corrosion and Coatings
Delamination
Diamond-like carbon films
Electrochemistry
Hydrogen
Hydrogen charging
Hydrogen embrittlement
Hydrogen permeation
Materials Science
Mechanical properties
Permeation
Structural Materials
Substrates
Surface roughness
Tribology
Wear resistance
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Summary:Diamond-like carbon (DLC) coating is a surface coating technology with excellent hydrogen permeation resistance and wear resistance. However, it is difficult to completely prevent hydrogen permeation, and when hydrogen penetrates into the coating layer, the DLC coating is adversely affected. Therefore, we investigated the effect of hydrogen embrittlement on the adhesion strength and wear resistance of the DLC coating layer. As the results of the research, the surface roughness of the DLC coating was increased by a maximum of 3.8 times with hydrogen charging, and the delamination ratio of the DLC coating reached about 58%. In addition, the Lc3, which refers to the adhesion strength corresponding to the complete delamination of the DLC coating, was decreased by a maximum of 2.0 N due to hydrogen permeation. In addition, the wear resistance decreased due to hydrogen permeation, and the exposed width of the substrate due to wear increased by more than 4 times. It was also determined that hydrogen blistering or hydrogen-induced cracking occurred at the interface between the DLC coating and the chromium buffer layer due to hydrogen permeation, which decreased the durability of the DLC coating.
ISSN:2397-2106
2397-2106
DOI:10.1038/s41529-024-00460-y