Effect of high-pressure hydrogen exposure on wear of polytetrafluoroethylene sliding against stainless steel

K. Nakashima, A. Yamaguchi, Y. Kurono, Yoshinori Sawae, T. Murakami, Joichi Sugimura

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)

    Abstract

    Mechanical components in hydrogen energy systems, such as a fuel cell vehicle and related infrastructures, will operate in high-purity hydrogen. Especially, some seals and valves in fuel cell vehicles should articulate against metal counterface within a pressurized hydrogen gas. However, the effect of high-pressure hydrogen gas on tribological behaviour of materials used in sliding surfaces has not been identified yet. In this study, unfilled polytetrafluoroethylene (PTFE) pins and 316L austenitic stainless-steel discs were exposed to high-pressure hydrogen gas and then the chemical and physical changes in their surface and the tribological characteristics were investigated. The results of an X-ray photoelectron spectrometer analysis of the exposed stainless-steel surface indicated that metal oxides in the passive surface layer of stainless steel can be reduced significantly during the high-pressure hydrogen exposure. Increased metal contents of the stainless surface resulted in enhanced metal fluoride formation and subsequent development of a PTFE transfer film. Consequently, the exposed PTFE specimens showed lower specific wear rate when compared to the unexposed specimen.

    Original languageEnglish
    Pages (from-to)285-292
    Number of pages8
    JournalProceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
    Volume224
    Issue number3
    DOIs
    Publication statusPublished - Jan 1 2010

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films

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