采用恒载荷拉伸法、腐蚀电化学测试和断口分析技术等, 研究了P110钢在不同H2S/CO2含量的NACE-A溶液中的硫化物应力腐蚀(SSCC)行为. 结果表明, 在加载初期, P110钢的自腐蚀电位(Ecorr)急剧下降, 至极小值后缓慢升高, 达到稳定值后直至断裂, 试样断口呈脆性解理状. 当通入CO2量达到17%时, P110钢的自腐蚀电位降低, 自腐蚀电流(Icorr)增大, 加速钢的SSCC进程, 断口形貌为完全解理断裂; 随着溶液中通入CO2量增大, 钢的自腐蚀电位稍有升高, 自腐蚀电流减小, 试样断裂时间延长; 至CO2量达到50%, 断口形貌出现少量韧窝. 这种现象的产生与H2S/CO2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.
Constant load tensile test, electrochemical corrosion measurement and SEM analysis were adopted to study the sulfide stress corrosion cracking (SSCC) of P110 steel in H2S/CO2 NACE standard solution. The results show that, in the initial stage of loading, the E corr of P110 steel drops sharply and increases slowly again after reaching a minimum value. Then the Eorr increases to constant value until fracture occurs, and the brittle cleavage fracture appears correspondingly. When the content of CO2 increasing to 17%, the Ecorr of P110 steel decreases, the corrosion current increases, the process of SSCC is speeding up, and thereby complete cleavage fracture appears correspondingly. With the content of CO2 further increasing, the Ecorr of P110 steel increases slightly, and the corrosion current decreases, the time to fracture is extended. When the content of CO2 increasing to 50%, small quantity of toughness dimples on the fracture surface appears correspondingly. This phenomenon has the relevance to the combination of competitive adsorption of H2S/CO2 on the surface of steel with tensile breakdown and regeneration of surface film on P110 steel in stress corrosion environment.
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