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| 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) |
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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.
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Received: 25 April 1987
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