A hyphenated optical-electrochemical technique and image analysis protocol is used to quantify global and local (intermetallic) corrosion process and kinetics. Our findings reveal an early stage (< 60 s) composition-dependent hierarchical local activation of all IMs that can be attributed to IM dealloying. This is followed by local trenching initiated at matrix locations adjacent to regions of the IMs previously dealloyed, which in turn develops into concentric trenching around the IMs. These stages have quantifiable activation times and kinetics. While dealloying kinetics are found to be strongly dependent on IM composition and slightly dependent on IM size in the case of the S-phases, trenching kinetics are IM composition and size independent.

连接的光电化学技术和图像分析协议用于量化全局和局部（金属间）腐蚀过程和动力学。我们的研究结果揭示了 所有 IM的早期（< 60 s）依赖于成分的分层局部激活，可归因于 IM 脱合金。随后是在与先前脱合金的 IM 区域相邻的基体位置处开始的局部开槽，这反过来发展为围绕 IM 的同心开槽。这些阶段具有可量化的活化时间和动力学。虽然在 S 相的情况下，发现脱合金动力学强烈依赖于 IM 成分，而略微依赖于 IM 尺寸，但开槽动力学与 IM 成分和尺寸无关。