AZ91D镁合金电子设备耐腐蚀性复合表面处理工艺技术

Corrosion resistance composite surface treatment technology for AZ91D magnesium alloy electronic equipment

镁合金耐腐蚀性差,易氧化,严重影响了其使用寿命。针对镁合金单独零件的微弧氧化、钝化和镀镍等表面处理,开展了一系列防腐蚀性试验研究。结果表明:单独零件在先微弧氧化后油漆的复合表面处理方式下可通过GJB150A中规定的96 h盐雾试验考核。与镁合金单独零件相比,镁合金电子设备还会出现电偶腐蚀和间隙腐蚀的情况。因此,有针对性地开展了镁合金材料电子设备的防腐蚀性结构设计。结果表明:在采用微弧氧化、喷漆和Parylene气相沉积复合工艺表面处理的电子设备,成功通过GJB150.11A中规定的96 h盐雾试验考核。

Corrosion resistant of magnesium alloy is poor and easy to oxidize,which affects its service life seriously. A series of anticorrosive tests were carried out,aiming at surface treatment of magnesium alloy parts such micro arc oxidation,passivation and nickelage. The results showed that separate part that was painted after micro arc oxidation can be checked by the 96 h salt spray test specified in GJB150 A. Compared with separate magnesium alloy part,there will be galvanic corrosion and interstitial corrosion in electronic devices of magnesium alloy. The anti-corrosion structure design of electronic equipment of magnesium alloy was carried out. The results showed that the electronic equipment with composite surface treatment with micro arc oxidation,spray paint and Parylene gas phase deposition was checked tested the 96 h salt spray test specified in GJB150. 11 A successfully.