镁合金具有比重小,比强度、比刚度高,阻尼系数小,电磁屏蔽性能及铸造性能优良等特点,然而其耐蚀性能差.结合微弧氧化和化学镀铜技术在镁合金表面制备了复合膜层,以提高其耐蚀性和装饰效果.用金相显微镜和扫描电子显微镜及极化曲线研究了膜层的性能.研究结果表明:复合膜层由基体、陶瓷层、铜层构成,其微观组织结合良好.复合膜层的腐蚀电位较镁合金基体提高了300mV以上.腐蚀电流降低至基体的8%.用热震法测其结合强度可重复10次以上.
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