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用恒载荷拉伸法,结合腐蚀电化学测试技术和断口扫描电镜(SEM)分析技术,研究了P110钢在H_2S/CO_2NACE标准溶液中的硫化物应力腐蚀(SSCC)行为。结果表明,随着溶液中的H_2S含量增高,P110钢的自腐蚀电位(E_(corr))急剧下降,至极小值后缓慢升高,约5 h后达到稳定值直至断裂,试样呈解理状脆性断口;随溶液中通入CO_2量的增大,P110钢的自腐蚀电位(E_(corr))稍有增高,自腐蚀电流(I_(corr))减小,试样断裂时间延长,断口由脆性解理向韧窝状韧性转化。这种现象的产生与H_2S/CO_2在钢表面的竞争吸附及P110钢在应力腐蚀环境中表面膜的拉伸破裂与再生有关。
The behavior of sulfide stress corrosion (SSCC) of P110 steel in H 2 S / CO 2 NACE standard solution was investigated by means of constant load tensile test, electrochemical corrosion test and fracture surface scanning electron microscope (SEM). The results showed that the corrosion potential of P110 steel decreased rapidly with the increase of H 2 S content in solution, and slowly increased after reaching a minimum value. After reaching a steady value after 5 h, the sample was cleaved Brittle fracture. With the increase of the amount of CO 2 introduced into the solution, the corrosion potential of P110 steel increased slightly (E corr), the corrosion current (I corr) decreased, the fracture time of sample increased, From brittle cleavage to ductile toughness transformation. The occurrence of this phenomenon is related to the competitive adsorption of H 2 S / CO 2 on the steel surface and the tensile fracture and regeneration of the surface film in the stress corrosion environment of P110 steel.