Abstract：The effect of micro/low alloying elements on the corrosion resistance of stainless steel was determined by the integrated model of "dissolution-ionization-deposition". The H2S corrosion resistance of HP-13Cr stainless steel was controlled by adding 1%wt Cu element, and prepared HP-13Cr-Cu stainless steel. The model calculation results show that Cu element first enrich at the surface of stainless steel during H2S corrosion process. Subsequently, high concentration Cu2+ is generated by the dissolution of stainless steel, and CuS is the most preferentially deposited during the deposition of corrosion products due to the lower Ksp. Then CuS deposited preferentially promotes Cr2O3 nucleation as a heterogeneous nucleation site, and Cr2O3 serves as a secondary nucleation site to further improve the nucleation rate of other corrosion products. Thus, the corrosion products formed by HP-13Cr-Cu in H2S environment have higher density and stronger protection. H2S corrosion experiment results indicate that, compared with HP-13Cr, HP-13Cr-Cu has a lower corrosion rate at 25-200 ℃ and 0.1-0.5 MPa H2S. The decrease of corrosion rate of HP-13Cr-Cu is more obvious with the increasing temperature. Serious sulfur induced stress corrosion cracking occurs for HP-13Cr stainless steel under stress. No stress corrosion cracking occurs in 0.1 MPa H2S environment, and good stress corrosion cracking resistance is still maintained in 0.5 MPa H2S environment. The results of element distribution indicate that Cu element is enriched in the corrosion scale and substrate, and concentration of Cr element increase in the corrosion product. The experimental results verify the correctness of the theoretical calculation.
赵阳, 齐文龙, 张涛, 王福会. 微合金化设计耐高温、高H2S分压的HP-13Cr-Cu不锈钢[J]. 钢铁, 2023, 58(9): 194-208.
ZHAO Yang, QI Wenlong, ZHANG Tao, WANG Fuhui. Micro-alloying design of HP-13Cr-Cu stainless steel with high temperature and high H2S partial pressure resistance[J]. Iron and Steel, 2023, 58(9): 194-208.
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