Morphological Change and Open-circuit Potential of Single Metastable Pit on AA1050 Aluminum in NaCl Solution
Morphological Change and Open-circuit Potential of Single Metastable Pit on AA1050 Aluminum in NaCl Solution
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DOI：
10.1149/1945-7111/abdee9
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发表时间：
2021-02
影响因子：
3.9
通讯作者：
H. Kakinuma;I. Muto;Y. Oya;Takahiro Momii;Y. Sugawara;N. Hara
中科院分区：
文献类型：
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作者：
H. Kakinuma;I. Muto;Y. Oya;Takahiro Momii;Y. Sugawara;N. Hara
研究了AA1050铝在0.1M氯化钠溶液中的开路电位变化与Al-Fe-Si颗粒亚稳态点蚀形貌的关系。首先，随着OCP的突然降低，亚稳坑在深度方向上逐渐长大。第二，凹坑开始在Al表面生长，OCP保持在较低水平。最后，随着OCP的再次增加，坑被重新钝化。在电极面积为1cm2的OCP测量的早期阶段，发现电位振荡和值与许多亚稳态坑的生长有关，而不是与每个亚稳态坑的起始和再钝化有关。OCP振荡的幅度随时间的延长而减小并消失。然后，OCP缓慢下降并趋于恒定。从亚稳态到稳定点蚀的转变被认为是逐步发生的。
The relationship between the change in the open-circuit potential (OCP) and the morphology of metastable pitting at Al–Fe–Si particles of AA1050 aluminum in 0.1 M NaCl was clarified. First, a metastable pit grew in the depth direction as the OCP decreased suddenly. Second, the pit started to grow on the Al surface, and the OCP remained low. Finally, the pit was repassivated with the reincrease of the OCP. In the early stage of OCP measurements of the electrode area of 1 cm 2, the potential oscillations and values were found to be associated with the growth of many metastable pits rather than the initiation and repassivation of each metastable pit. The amplitude of the OCP oscillation decreased with time and disappeared. Then, the OCP decreased slowly and became constant. The transition from metastable to stable pitting was determined to occur gradually.