研究Al-Zn-Mg-Cu系LC4铝合金微弧氧化陶瓷膜生长动力学,测量样品外形尺寸随氧化时间的变化.分析膜的形貌、成分和相组成,测定膜层的显微硬度分布,并评估氧化前后样品的电化学腐蚀性能.氧化初期电流密度较高,膜生长较快.进入平稳生长期后,电流密度基本保持恒定,膜生长速度降低.膜层由γ-Al2O3, α-Al2O3 和SiO2非晶相组成,γ-Al2O3的含量较高.氧化膜硬度比铝基体高得多,膜内层和外层平均硬度分别为1600 HV, 450HV.LC4铝合金经过微弧氧化处理后,腐蚀电流大幅下降,耐蚀性得到很大提高.
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