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

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Materials Degradation Pub Date : 2024-05-04 DOI:10.1038/s41529-024-00460-y

Dong-Ho Shin, Seong-Jong Kim

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Abstract

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.

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氢脆对用于 FCEV 氢气阀门的 DLC 涂层机械特性的影响

类金刚石碳（DLC）涂层是一种表面涂层技术，具有优异的抗氢渗透性和耐磨性。然而，氢渗透很难完全避免，当氢渗入涂层时，DLC 涂层会受到不利影响。因此，我们研究了氢脆对 DLC 涂层层附着强度和耐磨性的影响。研究结果表明，在充氢的情况下，DLC 涂层的表面粗糙度最大增加了 3.8 倍，DLC 涂层的分层率达到了约 58%。此外，由于氢的渗透，DLC 涂层完全分层时的附着强度 Lc3 最大下降了 2.0 N。此外，氢渗透还导致耐磨性下降，基底因磨损而暴露的宽度增加了 4 倍多。研究还发现，由于氢的渗透，DLC 涂层和铬缓冲层之间的界面出现了氢起泡或氢致裂纹，从而降低了 DLC 涂层的耐久性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

npj Materials Degradation MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

7.80

自引率

7.80%

发文量

审稿时长

6 weeks

期刊介绍： npj Materials Degradation considers basic and applied research that explores all aspects of the degradation of metallic and non-metallic materials. The journal broadly defines ‘materials degradation’ as a reduction in the ability of a material to perform its task in-service as a result of environmental exposure. The journal covers a broad range of topics including but not limited to: -Degradation of metals, glasses, minerals, polymers, ceramics, cements and composites in natural and engineered environments, as a result of various stimuli -Computational and experimental studies of degradation mechanisms and kinetics -Characterization of degradation by traditional and emerging techniques -New approaches and technologies for enhancing resistance to degradation -Inspection and monitoring techniques for materials in-service, such as sensing technologies