(北京化工大學(xué) 材料科學(xué)與工程學(xué)院，北京 100029)
摘 要: 用電化學(xué)方法和掃描電子顯微鏡研究氧化時(shí)間、硫酸濃度、氧化電流密度等氧化工藝參數(shù)對(duì)ZL201鋁合金陽極氧化膜受熱開裂行為的影響，并分析討論氧化膜中內(nèi)應(yīng)力的產(chǎn)生機(jī)理。結(jié)果表明：氧化膜封閉后存在少量缺陷，加熱時(shí)會(huì)沿缺陷形成開裂并產(chǎn)生新裂紋。隨氧化時(shí)間延長，氧化膜受熱后裂紋數(shù)量增多；隨硫酸濃度增大，氧化膜受熱后裂紋密度增大；而隨著氧化電流密度的增大，氧化膜受熱后裂紋密度減小。
關(guān)鍵字: 陽極氧化膜；耐熱性；裂紋；內(nèi)應(yīng)力
（School of Materials of Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China）
Abstract: The effects of oxidation time, sulfuric acid concentration and current density on heat-resistance of anodic film formed on ZL201 aluminium alloy were studied by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The generation of residual stress was also discussed. The results show that there exists a few cracks in sealed anodic oxidation films. When the films are heated, the initial cracks become larger and some new cracks occur. The longer the anodic oxidation is, the more the cracks in the films after heating. The higher density of cracks in anodic films, which are anodized in higher concentration of sulfuric acid solutions, can also be found after heating. On the contrary, with the increase of oxidation current density, the density of cracks in anodic films after heating decreases.
Key words: anodic oxide film; heat-resistance; crack; internal stress
