Hydrogen interaction characteristic of nanoscale oxide films grown on iron–nickel based stainless steel by selective thermal oxidation. (10th August 2017)

• Record Type: Journal Article
• Authors: Zeng, Cheng; Bai, Yakui; Ling, Yunhan; Xin, Zhiyuan; Liang, Hao; Deng, Xiukun
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 32(2017)
• Page Start: 20910
• Page End: 20921
• Publication Date: 2017-08-10
• Subjects: Stainless steel -- Selective oxidation -- Hydrogen annealing -- Electrochemistry; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.02.206
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Hydrogen isotopes, the reaction ingredients in the nuclear fusion plant, can easily permeate through the stainless steel (SS) substrate, leading to the so-called hydrogen degradation. Generally, a widely accepted way to reduce the hydrogen permeation is to prepare a barrier coating on the substrate. Nevertheless, the coated layer has the inherent problem of incompatibility with the heterogeneous base materials. In this work, in-situ selective oxidation was used to explore the optimal oxides with the improved hydrogen resistance. Two types of layers thermally formed at 450 °C and 750 °C, respectively, were selected to investigate their hydrogen interaction characteristics. Comprehensive analyses, including Raman spectra, XPS, EIS and AES, indicate that the oxide formed at 450 °C is a better candidate of hydrogen permeation barriers, probably due to the formation of protective layers of chromia and FeCr2 O4, while the oxides obtained at 750 °C, though exhibiting a much more stable phase, can rarely reduce hydrogen diffusion through the shortcuts of defects. This finding provides a potential new way to prepare a hydrogen permeation barrier. Graphical abstract: Highlights: Nanoscale oxides were in-situ prepared via selective thermal oxidation. The growth mechanism of oxides formed at 450 °C and 750 °C is investigated. Oxides formed at 450 °C proved to be better hydrogen permeation barriers.