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在室温条件下向锆盐作为主盐的溶液中加入添加剂,在铝合金表面制备了黄色的锆盐转化膜。利用扫描电子显微镜(SEM)和X射线光电子能谱(XPS)等分析了转化膜的表面形貌与成分;通过电化学工作站测试了转化膜的极化曲线、阻抗谱图,研究了转化膜的耐蚀性能;依据国标对转化膜的附着力进行了测试。结果表明,铝合金表面的锆盐转化膜由粒度比较均匀的球形小颗粒构成,表面均匀,转化膜的主要组成元素为Al、F、Zr、O、C等;其极化电阻较空白铝合金有较大幅度的提升,自腐蚀电流密度降低,铝合金的耐腐蚀性得到显著的提升,并且转化膜提高了漆膜与铝合金的附着力。
Addition of additives to the solution of zirconium salt as the main salt at room temperature prepared a yellow zirconium salt conversion coating on the surface of the aluminum alloy. The surface morphology and composition of the conversion coating were analyzed by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The polarization curves and impedance spectra of the conversion coating were measured by electrochemical workstation. Corrosion resistance; Based on the national standard of the adhesion of the conversion film was tested. The results show that the zirconium salt conversion film on the surface of aluminum alloy is composed of spherical particles with uniform particle size and uniform surface. The main components of the conversion film are Al, F, Zr, O, C, etc .; the polarization resistance is higher than that of blank aluminum alloy A substantial increase in self-corrosion current density is reduced, the corrosion resistance of aluminum alloy has been significantly improved, and the conversion film to improve the adhesion of the paint film and aluminum alloy.