The artificial pit technique was employed to investigate the stable pit growth of CoFeSiBCr metallic glasses (MGs) exposed to 0.6 M NaCl solution. Critical parameters of pit growth stability were assessed to clarify the correlation between structural heterogeneity and stable pitting kinetics. Thermally induced degeneration of structural heterogeneity increases the repassivation potential and critical pit solution concentration required for pit survival, thus strongly inhibits the activation-controlled growth of salt-film-free pits. Nevertheless, the inhibitory effect on the diffusion-controlled growth of salt-film-covered pits is relatively weak, as revealed by the fact that the saturation concentration required for salt precipitation remains unaffected.

中文翻译：

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结构异质性对钴基金属玻璃稳定凹坑生长的影响

采用人工坑技术研究了暴露于 0.6 M NaCl 溶液中的 CoFeSiBCr 金属玻璃（MG）的稳定坑生长。评估凹坑生长稳定性的关键参数，以阐明结构异质性和稳定凹坑动力学之间的相关性。结构异质性的热诱导退化增加了凹坑生存所需的再钝化电位和临界凹坑溶液浓度，从而强烈抑制了无盐膜凹坑的活化控制生长。然而，对盐膜覆盖凹坑的扩散控制生长的抑制作用相对较弱，这可以从盐沉淀所需的饱和浓度不受影响的事实看出。