The effect of different surface treatments(pulse current anodizing, direct current anodizing and acid pickling passivating) on painting adhesion and galvanic corrosion behavior of titanium alloy Ti-6A1-4V coupled with aluminum alloy 2024 treated chromic acid anodizing was studied. Result of microstructure and tape adhesion tests shows porous film on the surface of titanium alloy treated by pulse current anodizing can effectively improve its painting adhesion . It was demonstrated by galvanic corrosion test that anodized films on titanium alloy can significantly reduce the susceptibility of galvanic corrosion between titanium alloy and aluminum alloy. Pulse current anodizing process shows better performance than direct current anodizing and acid pickling passivating in application by the results of these comparison.%对比研究了经不同表面处理工艺(脉冲阳极氧化、直流阳极氧化、酸洗钝化)处理后的钛合金表面的漆层结合力及其与经铬酸阳极氧化处理的2024铝合金组成的电偶对的电偶腐蚀性能.结果表明:脉冲阳极氧化处理的钛合金表面呈明显的多孔结构,有效地提升了基体与漆层的结合力,同时钛合金表面的阳极氧化膜层还可有效降低与其对接的铝合金材料的电偶腐蚀倾向.在综合性能方面这种新型的脉冲阳极氧化工艺优于传统直流阳极氧化和酸洗钝化工艺.
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