低碳钢在“乙醇胺+CO_2”水溶液中的应力腐蚀开裂

中国腐蚀与防护学报

1987, Vol. 7

Issue (2): 139-142

研究报告

本期目录 | 过刊浏览

低碳钢在“乙醇胺+CO_2”水溶液中的应力腐蚀开裂

陈显德;吴希俊

中国科学院固体物理研究所;机械工业部郑州机械研究所;中国科学院固体物理研究所

THE STRESS CORROSION CRACKING OF LOW CARBON STEEL IN "ETHANOLAMINE + CO_2" SOLUTION

Chen Xiande and Wu Xijun(Institute of Solid State Physics; Academia Sinica)

全文: PDF(889 KB)

摘要: <正> 一、引言我国炼油工业中的脱硫装置溶剂再生塔通常应用乙醇胺水溶液脱除进料中的酸性气体CO_2和H_2S。温度较低时,乙醇胺吸收酸性气体;温度升高时又重新放出所吸收的酸性气体,其可逆反应如下[1]: 2RNH_2+CO_2+H_2O(?)[(RNH_2)H]_2CO_3 2RNH_2+H_2S(?)[(RNH_2)H]_2S 反应式中R代表-OHCH_2CH_2。关于应用乙醇胺脱除酸性气体的详细工艺过程参看文献。由于乙醇胺和酸性气体构成的复杂环境和应力(包括焊缝残余应力)的联合作用,经常使再生塔高温塔段(塔内环境的温度为90～120℃,pH值为9～11)发生应力腐蚀开裂

Abstract：The stress corrosion cracking(SCC)behavior of low carbon steel with hardness HRC less than 22, in 15% ethanolamine aqueous solution aerated with CO_2 gas at 100℃ was investigated using slow strain rate testing ((?)=6.4×10~(-6)s~(-1))under applied constant potentials. The experimental results show that carbon steel is susceptible to SCC in the "ethanolamine+CO_2" environment. The susceptibility to SCC occurs in the potential range of active-passive transition region, -0.40～-0.70V(SCE), of fast-slow sweep rate polarization curves, with highest susceptibility to SCC at potential of-0.65 V(SCE). The mechanism of SCC is mainly anodic dissolution. The SCC is characterized by decrease of reduction in area at fracture , appearance of secondary cracks on the surface of specimens, intergranular cracking mode and formation of passive film Fe_3O_4 during the polarization process. Based on the similarity between the main experimental results obtained under simulating conditions and the cracking characteristics of regenerating column, it could be concluded that the oeeurrance of cracks in the part of regenerating column for desulphurization operated at high temperature was mainly caused by the susceptibility to SCC of low carbon steel in the "ethanolamine+CO_2" solution.

收稿日期: 1987-04-25

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引用本文:

陈显德;吴希俊. 低碳钢在“乙醇胺+CO_2”水溶液中的应力腐蚀开裂[J]. 中国腐蚀与防护学报, 1987, 7(2): 139-142.
. THE STRESS CORROSION CRACKING OF LOW CARBON STEEL IN "ETHANOLAMINE + CO_2" SOLUTION. J Chin Soc Corr Pro, 1987, 7(2): 139-142.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1987/V7/I2/139

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