Development of multi-physics measurement system for corrosion-fatigue interaction fracture

为了阐明腐蚀-疲劳交互作用的断裂机理，我们开发了一种新的电化学/力学多物理测量系统来评估断裂中的腐蚀电场和应力/应变场。研究了高压压铸铝合金在室温盐水溶液中的腐蚀行为。测定了恒拉应力下的极化特性，并进行了低周腐蚀疲劳的原位观察。实验结果表明，随着拉应力的增加，电偶腐蚀的自发电位几乎呈线性下降，拉应力促进了电偶腐蚀的发生。

To elucidate the fracture mechanism by the corrosion-fatigue interaction, we developed a new electrochemical/mechanical multi-physics measurement system to evaluate the corrosion electrical field and stress/strain fields in the fracture. The high-pressure die cast aluminum alloy in saline solution of room temperature was investigated. The polarization property under constant tensile stresses was measured, and the in situ observation of low-cycle corrosion fatigue was conducted. We found from the experiments that the spontaneous potential almost linearly decreased as the tensile stress increased and the galvanic corrosion was facilitated by the tensile stress.