表面处理工艺对TC4钛合金微弧氧化膜层及电偶电流的影响

MAO (Micro-arc oxidation) films on TC4 Ti-alloy was prepared, and which then subjected to different post-treatments such as silanization sealing and high temperature oxidation. The MAO/TC4 Ti-alloy before and after post-treatments was characterized by SEM and electrochemical workstation in terms of their surface morphology and performance in galvanic corrosion. The results shows that the surface morphology of the micro-arc oxide film is not significantly changed by high temperature oxidation. TC4 Ti-alloy can easily be suffered from galvanic corrosion when contacting with steel, while the galvanic current density and galvanic corrosion sensitivity of TC4 Ti-alloy couple can be reduced after micro-arc oxidation treatment. The galvanic current density of MAO/TC4 Ti-alloy couple is little affected by silanization sealing treatment, but it is obviously reduced by combined treatments of high temperature oxidation and then silanization sealing.

Keywords： TC4 Ti-alloy ; high temperature oxidation ; micro-arc oxidation ; galvanic corrosion