采用X射线衍射(XRD)和扫描电镜能谱(EDS)面扫描分析技术,研究了Al含量对实验室模拟的潮湿大气中由NaCl盐粒诱发的3种镁合金腐蚀产物膜结构和成分的影响.结果表明,腐蚀产物主要为Mg(OH)2和Mg2(OH)3C1·4H2O,随着合金中Al含量的增加,腐蚀产物中Al参与生成的产物增多,但腐蚀产物膜的结构变得疏松多孔.采用电化学交流阻抗(EIS)测试了膜层的保护性.结果表明,3种不同Al含量镁合金腐蚀产物膜的保护性能均随着暴露时间的延长而提高;在相同的暴露时间内,镁合金中Al含量越高,腐蚀产物膜的阻抗值愈小,膜层的保护性愈差.其原因是Al的含量越高,腐蚀产物膜的结构变得愈加疏松和多孔.
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