7475铝合金阳极氧化膜表面-界面组织与特征Surface-interface structures and characteristics of anodic oxidation film on 7475 aluminium alloy

利用阳极氧化法在7475铝合金表面制备一层氧化膜。通过SEM、EDS、XRD等手段分析其表面-界面形貌、化学元素组成和物相，对其表面和结合界面化学元素进行面扫描和线扫描分析，并对氧化膜界面结合形式进行表征。结果表明：阳极氧化膜主要是由Al和O元素组成，还含有板材中所不具备的C、K和S元素，主要来源于阳极氧化的电解液；生成的氧化膜为稳相α-Al₂O₃和亚稳相γ-Al₂O₃，其中以α-Al₂O₃为主；Al和O原子在氧化膜结合界面形成富集层，其界面为化合物型+扩散型形式。

The layer of oxide film was prepared on the surface of 7475 aluminum alloy by anodic oxidation method. The surface-interface morphologies, chemical element compositions and phases were analyzed by SEM, EDS and XRD, respectively, and the chemical elements of the surface and bonding interface were analyzed by plane scan and line scan, respectively, and the interface binding of oxide film was characterized. The results show that anodic oxide film is made up of Al and O elements and C, K and S elements from the anodic oxidation electrolyte of anodic oxidation film. The produced oxide film is composed of stationary phase α-Al₂O₃ and metastable phase γ-Al₂O₃, mainly includes α-Al₂O₃. The hierarchical enrichment phenomenon of Al and O atoms in the oxide film is produced after anodic oxidation, the bonding form of compound type + diffusion type forms at the interface.

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