Yang Zixuan, Kan Bo, Li Jinxu, Qiao Lijie, Volinsky Alex A, Su Yanjing
Corrosion and Protection Center, Key Laboratory for Environmental Fracture (MOE), University of Science and Technology Beijing, Beijing 100083, China.
Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620, USA.
Materials (Basel). 2017 Nov 14;10(11):1307. doi: 10.3390/ma10111307.
Hydrostatic pressure effects on pitting initiation and propagation in X70 steel are investigated by evaluating metastable pitting probability using electrochemical methods and immersion corrosion tests in containing chlorine ion solution. Potentiodynamic tests indicated that hydrostatic pressure can decrease the breakdown potential and lead to a reduced transpassivity region. Metastable test results revealed that hydrostatic pressure can increase metastable pitting formation frequency and promote stabilization of metastable pitting growth. Electrochemical impedance spectroscopy (EIS) results indicate that Hydrostatic pressure decreases the charge transfer resistance and increases the dissolution rate within the cavities. Corrosion test results also indicated that pitting initiation and propagation are accelerated by hydrostatic pressure. Result validity was verified by evaluating metastable pitting to predict pitting corrosion resistance.
通过使用电化学方法评估亚稳态点蚀概率以及在含氯离子溶液中的浸泡腐蚀试验，研究了静水压力对X70钢点蚀萌生和扩展的影响。动电位测试表明，静水压力会降低击穿电位并导致过钝化区减小。亚稳态测试结果表明，静水压力会增加亚稳态点蚀形成频率并促进亚稳态点蚀生长的稳定。电化学阻抗谱（EIS）结果表明，静水压力会降低电荷转移电阻并提高空洞内的溶解速率。腐蚀试验结果还表明，静水压力会加速点蚀的萌生和扩展。通过评估亚稳态点蚀来预测点蚀耐蚀性，验证了结果的有效性。
