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- Title
Effect of Hydrogen on Corrosion Behavior of 321 Stainless Steel in NH 4 Cl Solution.
- Authors
Xu, Xiuqing; Wang, Wei; Suo, Tao; Jiang, Lei; Yin, Xiangkun; Cheng, Guangxu; Fu, Anqing; Yang, Fang
- Abstract
For a hydrogenation heat exchanger operating under severe working conditions such as high temperature, high pressure and a hydrogen environment, perforation accidents caused by NH4Cl corrosion occur frequently. However, few reports on the effect of hydrogen on the corrosion behavior of metal materials in NH4Cl aqueous solution have been published. In this paper, X-ray photoelectron spectroscopy (XPS), electrochemical dynamic potential polarization, electrochemical impedance spectroscopy (EIS), Mott–Schottky (M-S) curves and scanning electron microscopy (SEM) were used to study the effect of electrochemical hydrogen charging (EHC) on the corrosion behavior of 321 stainless steel in an NH4Cl solution environment. The results show that: (1) hydrogen can change the structure and chemical composition of 321 stainless steel passive film and promote the conversion of metal oxide to hydroxide. At the same time, it can reduce the stability of the passive film. (2) Hydrogen can increase the thermodynamic and kinetic tendency of corrosion reaction and cooperate with Cl− to promote the occurrence of pitting corrosion.
- Subjects
ELECTROLYTIC corrosion; STAINLESS steel; X-ray photoelectron spectroscopy; HYDROGEN; METALLIC oxides; CHEMICAL structure; PITTING corrosion
- Publication
Materials (1996-1944), 2022, Vol 15, Issue 19, p7010
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma15197010