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为了研究船舶与海洋工程结构在载荷和腐蚀环境联合作用下的腐蚀损伤规律,通过电化学测试技术研究了弹性应力对Q235B钢在质量分数为3.5%NaCl溶液中的腐蚀电位、动电位极化曲线、线性极化电阻和电化学阻抗谱的影响规律;同时,利用接触角测量技术研究了弹性应力对金属在腐蚀介质中界面张力的影响.研究结果表明:随着弹性应力的增大,Q235B钢在3.5%NaCl溶液中的腐蚀电位明显负移,腐蚀速率显著增大,根据电化学测试结果建立了腐蚀速率与应力关系模型;界面张力与接触角随着应力的增大而显著减小,因此可以利用金属材料在环境介质中的界面张力研究力学-化学效应问题.
In order to study the corrosion damage of ship and offshore structures under the combined action of load and corrosive environment, the corrosion potential, the potentiodynamic polarization curve of Q235B steel in 3.5% NaCl solution were studied by electrochemical testing technique. , Linear polarization resistance and electrochemical impedance spectroscopy. At the same time, the influence of elastic stress on the interfacial tension in corrosive media was studied by using the contact angle measurement technique.The results show that with the increase of elastic stress, Q235B steel In 3.5% NaCl solution, the corrosion potential obviously shifts negatively and the corrosion rate increases significantly. Based on the electrochemical test results, the model of corrosion rate and stress is established. The interfacial tension and contact angle decrease remarkably with the increase of stress Mechanics-chemical effects can be explored using interfacial tensions of metallic materials in environmental media.