7A04-T6鋁合金中金屬間化合物對其陽極氧化膜耐蝕性的影響

Effects of Inter-metallic Particles on Corrosion Resistance of Anodic Films on 7A04-T6 Aluminium Alloy

為研究7A04-T6鋁合金中金屬間化合物對其陽極氧化膜耐蝕性的影響，采用激光共聚焦顯微鏡對熱擠壓7A04-T6鋁合金棒材不同方向截面的金相組織進(jìn)行觀察，并借助背散射和能譜鑒別組織中尺寸較大的金屬間化合物顆粒，然后觀察試樣上含有金屬間化合物區(qū)域在陽極氧化前、后和腐蝕不同時(shí)間后的形貌，并對腐蝕不同時(shí)間后的試樣進(jìn)行電化學(xué)阻抗譜(EIS)測試。結(jié)果表明，7A04-T6鋁合金中尺寸較大的金屬間化合物顆粒導(dǎo)致的陽極氧化膜孔洞是陽極氧化膜底部腐蝕、氧化膜破裂和最終完全失效的原因。
In order to study the effects of inter-metallic particles on the corrosion resistance of anodic films on 7A04-T6 aluminium alloy, the metallographic microstructure of hot extrusion rod of 7A04-T6 aluminium alloy was observed by scanning laser confocal microscopy. The inter-metallic particles were identified by backscattered electron image. The morphologies of the areas with inter-metallic particles were traced before and after anodization and after immersion in exfoliation corrosion liquid for different times. The electrochemical impedance spectroscopy (EIS) was measured. The results indicated that the cavities caused by larger inter-metallic particles in the anodic films on 7A04 aluminium alloy were responsible for the corrosion beneath anodic films, the cracking and final complete failure of anodic films.

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