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

WANG Hao; WANG Danqing; XI Kenan; LÜ Youjun

doi:10.7652/xjtuxb202507018

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

更新时间：2025-07-09

- Study on the Corrosion Mechanisms of Nickel-Based Alloys in Hydrogen-Containing Supercritical Water
- Journal of Xi’an Jiaotong University Vol. 59, Issue 7, Pages: 182-192(2025)
- 作者机构：
  
  1.西安交通大学绿色氢电全国重点实验室， 710049，西安
  2.比亚迪汽车有限公司， 710119，西安
  3.西北核技术研究院， 710024，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202507018
  CLC： TB37
- Received：02 February 2025，
  
  Online First：01 April 2025，
  
  Published：10 July 2025
- 稿件说明：
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WANG Hao, WANG Danqing, XI Kenan, et al. Study on the Corrosion Mechanisms of Nickel-Based Alloys in Hydrogen-Containing Supercritical Water[J]. Journal of Xi’an Jiaotong University, 2025, 59(7): 182-192.
DOI：

WANG Hao, WANG Danqing, XI Kenan, et al. Study on the Corrosion Mechanisms of Nickel-Based Alloys in Hydrogen-Containing Supercritical Water[J]. Journal of Xi’an Jiaotong University, 2025, 59(7): 182-192. DOI： 10.7652/xjtuxb202507018.

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

（3－

）

和Fe

（3－

）

，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。

Abstract

To address the corrosion issues of nickel-based alloys in a hydr

ogen-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

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

(3－

)

and Fe

(3－

)

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.

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