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Menghao Liu, Zhiyong Liu, Cuiwei Du, Xiaoqin Zhan, Chunduo Dai, Yue Pan, and Xiaogang Li, Effect of cathodic potential on stress corrosion cracking behavior of 21Cr2NiMo steel in simulated seawater, Int. J. Miner. Metall. Mater., 29(2022), No. 2, pp. 263-270. https://doi.org/10.1007/s12613-020-2199-5
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刘智勇 E-mail: liuzhiyong7804@ustb.edu.cn
杜翠薇 E-mail: dcw@ustb.edu.cn
海洋工程用系泊链钢经常遭受因阴极过保护导致的应力腐蚀开裂。因此，研究外加电位对系泊链钢的应力腐蚀影响规律及机制具有重要意义。本文旨在研究外加阴极电位对系泊链钢应力腐蚀行为的影响规律及机制。慢应变速率拉伸、电子背散射衍射和扫描电镜被用于本研究。以此为基础阐明了一类R5级别高强系泊链钢（21Cr2NiMo）在外加阴极电位下的应力腐蚀行为及机制。研究结果表明，21Cr2NiMo钢在强阴极极化下氢脆的敏感性较高；当外加电位在−775 mV vs. SCE时应力腐蚀敏感性最低；当外加电位低于−950 mV vs. SCE时应力腐蚀敏感性迅速升高。随着外加电位的降低断口形貌由穿晶型向沿晶型转变。随着外加阴极电位降低，沿晶型开裂从沿着板条贝氏体晶界开裂向沿着原奥氏体晶界开裂转变。扫描电镜结果表明点蚀促进了应力腐蚀裂纹萌生。随着外加电位降低，应力腐蚀机制由阳极溶解和氢脆机制混合控制转变为单一氢脆机制控制。
This study aims at providing systematically insights to clarify the impact of cathodic polarization on the stress corrosion cracking (SCC) behavior of 21Cr2NiMo steel. Slow-strain-rate tensile tests demonstrated that 21Cr2NiMo steel is highly sensitive to hydrogen embrittlement at strong cathodic polarization. The lowest SCC susceptibility occurred at −775 mV vs. SCE, whereas the SCC susceptibility was remarkably higher at potentials below −950 mV vs. SCE. Scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) revealed that the cathodic potential decline caused a transition from transgranular to intergranular mode in the fracture path. The intergranular mode transformed from bainite boundaries separation to prior austenitic grain boundaries separation under stronger cathodic polarization. Furthermore, corrosion pits promoted the nucleation of SCC cracks. In conclusion, with the decrease in the applied potential, the SCC mechanism transformed from the combination of hydrogen embrittlement and anodic dissolution to typical hydrogen embrittlement.
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