The anodic oxide film of aluminum alloy was sealed by cerium salt, and the scratch test was used to simulate the damage of the oxide film. The repair and corrosion inhibition effects of cerium in the oxide film on the simulated damaged site were studied by means of alternate immersion accelerated corrosion test, combined with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and electrochemical techniques. The results show that cerium in the undamaged oxide film diffused to the scratch and existed in the form of Ce (III) and Ce (IV), and formed the hydroxide with the cathode reaction product OH⁻ in the scratch. It was only when enough corrosion products were produced on the aluminum matrix in the scratch, both the corrosion products and the hydroxide of cerium would have a synergistic effect on inhibiting the cathode reaction, thus, cerium salt could play the role of corrosion inhibition.

中文翻译：

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模拟海洋大气环境中铈盐封闭对铝合金阳极氧化膜划痕的缓蚀行为

用铈盐封闭铝合金阳极氧化膜，采用划痕试验模拟氧化膜的破坏情况。采用交替浸泡加速腐蚀试验，结合扫描电子显微镜（SEM）、X射线光电子能谱（XPS）和电化学技术研究了氧化膜中铈对模拟损伤部位的修复和缓蚀作用。结果表明，未受损氧化膜中的铈扩散到划痕处，以Ce(III)和Ce(IV)的形式存在，并与阴极反应产物OH-形成氢氧化物^。在划痕中。只有当划痕处的铝基体上产生足够的腐蚀产物时，腐蚀产物与铈的氢氧化物才会对阴极反应产生协同抑制作用，从而使铈盐起到缓蚀作用。