室温下6063铝合金着色钛锆转化膜的制备及性能

Formation and characterization of chromatic Ti-Zr based conversion layers on AA6063 aluminum at room temperature

在6063铝合金表面形成了着色钛锆转化膜。用SEM/EDX分析了转化膜的表面形貌及成分,采用电化学工作站和点滴实验研究了转化膜的耐蚀性能,并对着色钛锆转化膜的成膜机理及耐蚀机理进行了分析。结果表明,添加锰盐和有机酸,可生成蜂窝状的着色转化膜,膜层更致密;转化膜的腐蚀电位更低,且腐蚀电流密度明显降低,说明钛锆钝化液中添加锰盐和有机酸,可以更好地抑制铝合金的阴极反应,从而更有效地提高铝合金的耐蚀性能。

The chromatic Ti-Zr conversion layers were prepared on the surface of AA6063 aluminum alloy. The surface morphology and composition of the conversion films were investigated by SEM/EDX and their corrosion performance was examined by electrochemical workstation and dropping test, and the film-forming mechanism and anti-corrosion mechanism of the chromatic Ti-Zr based conversion layers were discussed. The results show that the chromatic conversion layers was generated and it＇s honeycomb and more compact after adding the manganese salt and the organic acid, however the corrosion potential and the corrosion current of conversion layers decreases obviously. It reveals that adding the manganese salt and the organic acid into the titanium-zirconium solution can further suppress the catholic reaction of aluminum alloy, thus improving the anti-corrosion behavior of aluminum alloy efficiently.