临氢超临界水中镍基合金的腐蚀机理研究

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关键词：临氢环境；超临界水；镍基合金；腐蚀机理

中图分类号：TB37文献标志码：A

DOI：10.7652/xjtuxb202507018 文章编号：0253-987X（2025）07-0182-11

Study on the Corrosion Mechanisms of Nickel-Based Alloys in Hydrogen-Containing Supercritical Water

WANG Hao1，WANG Danqing1'²，XI Kenan1，³，LU Youjun1 （1.State KeyLaboratoryof MultiphaseFlowinPower Engineering，Xi'an Jiaotong University，Xi'an71o049，China; 2.BYDAutomotive Limited Company，Xi'an，71o119，China；3.Northwest Institute of Nuclear Technology，Xi'an，710024，China）

Abstract： To address the corrosion issues of nickel-based alloys in a hydrogen-containing supercritical water environment，this study explores the corrosion processes of Inconel 60o and Inconel 625 alloys through systematic experimentation，revealing their corrosion mechanisms. A systematic comparison is made of the corrosion processes of the two allys under different temperatures （575，600 ，and 625∘C ），different hydrogen partial pressures（1，2，and 3MPa ）， and different corrosion durations（72，120，and 168h ）. The corrosion mass gain patterns， surface elemental valence state distributions （XPS），and surface morphology characteristics （SEM） of the experimental samples are analyzed. The experimental results indicate that Inconel

625 alloy shows changes in mass after 120h and 168h of corrosion;both Inconel 6oo and Inconel 625 alloys，due to their lower Fe/Ni ratio and approximately 20% （204号 Cr content，easily form dense Fe-Cr and Ni-Cr spinel oxide structures， which provide good protection against corrosion，thus exhibiting excellent hydrogen corrosion resistance;when a certain amount of Cr （ 20% by mass） is present，a higher Fe/Ni ratio facilitates the formation of stable FexCr（3-x）O4 and FemNi（3-m）O4 ， which exhibit better hydrogen embrittlement resistance； among the two materials， Inconel 625 has superior hydrogen corrosion resistance compared to Inconel 6Oo. The findings provide support for material selection in containers used in hydrogen-containing supercritical water environments.

Keywords： hydrogen-containing environment； supercritical water； Ni-based aloy; corrosionmechanism

超临界水气化（SCWG）制氢技术，是利用超临界水的独特理化性质，在超临界水环境下对有机物进行低温催化、气化反应，生成氢气和二氧化碳。（剩余14980字）