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采用电化学阻抗和慢应变速率方法,结合扫描电子显微镜,研究了不同阴极极化电位下X80钢在鹰潭土壤模拟溶液中的应力腐蚀行为。结果表明:鹰潭土壤模拟溶液中,X80钢/溶液界面处电荷转移电阻随阴极极化程度增加先升后降。在自腐蚀电位条件下开裂机理为阳极溶解,当外加电位为-1000 m V(vs SCE),应力腐蚀敏感性最低,此电位为最佳保护电位;继续增大阴极极化程度,应力腐蚀敏感性增加,此时开裂机制为氢和应力协同作用下的氢致开裂。
Using electrochemical impedance and slow strain rate method, combined with scanning electron microscopy, the stress corrosion behavior of X80 steel in Yingtan soil simulating solution under different cathodic polarization potentials was studied. The results showed that the charge transfer resistance at the interface of X80 steel / solution increased first and then decreased with the increase of cathodic polarization in the simulated solution of Yingtan soil. Under the condition of self-corrosion potential, the cracking mechanism is anodic dissolution. When the applied potential is -1000 mV (vs SCE), the stress corrosion sensitivity is the lowest, and this potential is the best protection potential. The cathodic polarization degree and stress corrosion sensitivity Sexual increase, this time cracking mechanism for hydrogen and stress caused by hydrogen cracking under synergies.