摘要
针对临氢超临界水环境下的镍基合金腐蚀问题,采用实验方法探究了Inconel 600和Inconel 625合金的腐蚀过程并揭示腐蚀机理。系统比较了两种合金在不同温度(575、600、625℃)、不同氢气分压(1、2、3 MPa)和不同腐蚀时间(72、120、168 h)的临氢环境的腐蚀过程,分析实验试样的腐蚀增质量规律、表面元素价态(XPS)分布和表面形貌(SEM)特点。实验结果表明:Inconel 625合金在腐蚀时间达到120和168 h时出现质量变化;Inconel 600、Inconel 625合金由于具有较低的Fe/Ni比,同时含有20%左右的Cr,易生成致密的Fe-Cr与Ni-Cr尖晶石结构的氧化物,对合金具有较好的保护作用,因此表现出优异的抗氢腐蚀性能;在同时含有质量分数为20%的Cr时,Fe/Ni比越大,越容易生成稳定的Fe_(x)Cr_(3-x)O_(4)和FemNi_(3-m)O^(4),能表现出较好的抗氢脆性能;Inconel 625合金的抗氢腐蚀能力大于Inconel 600合金。该研究结果可为临氢超临界水中的容器选材提供支撑。
To address the corrosion issues of nickel-based alloys in a hydrogen-containing supercritical water environment,this study explores the corrosion processes of Inconel 600 and Inconel 625 alloys through systematic experimentation,revealing their corrosion mechanisms.A systematic comparison is made of the corrosion processes of the two alloys under different temperatures(575,600,and 625℃),different hydrogen partial pressures(1,2,and 3 MPa),and different corrosion durations(72,120,and 168 h).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 120 h and 168 h of corrosion;both Inconel 600 and Inconel 625 alloys,due to their lower Fe/Ni ratio and approximately 20%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 Fe_(x)Cr_(3-x)O_(4)and FemNi_(3-m)O^(4),which exhibit better hydrogen embrittlement resistance;among the two materials,Inconel 625 has superior hydrogen corrosion resistance compared to Inconel 600.The findings provide support for material selection in containers used in hydrogen-containing supercritical water environments.
作者
王浩
王丹青
席柯楠
吕友军
WANG Hao;WANG Danqing;XI Kenan;L Youjun(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;BYD Automotive Limited Company,Xi’an,710119,China;Northwest Institute of Nuclear Technology,Xi’an,710024,China)
出处
《西安交通大学学报》
北大核心
2025年第7期182-192,共11页
Journal of Xi'an Jiaotong University
基金
国家重点研发计划资助项目(2020YFA0714400)
国家自然科学基金资助项目(52488201)
博士后创新人才支持计划资助项目(BX20230293)。
关键词
临氢环境
超临界水
镍基合金
腐蚀机理
hydrogen-containing environment
supercritical water
Ni-based alloy
corrosion mechanism
