目的 探究硅烷处理对阴极电泳涂层的耐腐蚀性能及其与基体间结合力的影响.方法 对稀土镁合金表面进行硅烷前处理,再沉积阴极电泳涂层,评价涂层的耐腐蚀性能、抗溶胀性能,分析涂层的腐蚀微观形貌、组织结构及界面结合.结果 硅烷膜层具有一定的防护性能,能够减少阴极电泳涂层针孔、橘皮的出现,增强阴极电泳涂层的致密性.硅烷改性能够提高阴极电泳涂层与基体的结合力,硅烷预处理的电泳试样在NMP溶液中浸泡102 h,依然结合完好;而未经硅烷预处理的电泳试样浸泡7 min后,涂层就完全剥落.此外,硅烷处理能够极大地改善阴极电泳涂层的阻抗性能,使涂层在3.5％(质量分数)NaCl溶液中浸泡227 h的极化电阻Rp仍在108数量级以上.结论 硅烷阴极电泳复合涂层具有良好的耐蚀性能和抗溶胀性能,值得推广应用.
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