ABSTRACT

The effects of elastic and plastic strain on interfacial behaviour of X52 steel in high-pH solution are studied using slow strain rate tensile testing and Electrochemical Impedance Spectroscopy (EIS). The EIS data revealed a defined relationship between capacitance and resistance with elastic strain. The strain rate influenced the metal dissolution by favouring the active rate over the passive state conditions. The EIS results clearly show the reduction in passive film resistance and increase in passive film capacitance when the strain rate increases while the pre-formed passive film is damaged due to the slow repassivation rate. A transmission line model is also used to simulate the evolution of the electrochemical response and provide a quantitative perspective to the activation-stress conditions.

摘要

使用慢应变速率拉伸试验和电化学阻抗谱 (EIS) 研究了弹性和塑性应变对高 pH 溶液中 X52 钢界面行为的影响。EIS 数据揭示了电容和电阻与弹性应变之间的明确关系。应变速率通过有利于主动速率而​​不是被动状态条件来影响金属溶解。EIS 结果清楚地表明，当应变速率增加时，钝化膜电阻降低，钝化膜电容增加，而预形成的钝化膜由于再钝化速率缓慢而损坏。传输线模型还用于模拟电化学响应的演变，并提供对激活应力条件的定量视角。