LY12铝合金钼酸盐转化膜及其耐蚀性

Molybdate Conversion Coatings on LY12 Aluminum Alloy and Its Corrosion Resistance

应用电化学方法研究了LY12铝合金钼酸盐转化膜的成膜过程及其在 3.5 %NaCl溶液中的耐蚀性。结果表明 ,钼酸盐转化处理成膜工艺简单 ,经钼酸盐转化处理的铝合金的耐蚀性能提高 ,转化处理提高了铝合金的抗点腐蚀能力。电位 时间曲线表明钼酸盐转化膜成膜较为顺利。分析了膜的形成机理及耐蚀机理。

The forming process of the molybdate conversion coatings on LY12 aluminum alloy is electrochemically studied, and its corrosion resistance in 3.5% NaCl solution is also investigated. The experimental results show that the converstion coating forming process is simple and the corrosion resistance of the treated alloy is increased, and the pitting corrosion resistance of aluminum alloy is improved as well. The potential/time curves indicate that the formation of molybdate conversion coatings is going on smoothly. And the mechanisms of the coatings formation and corrosion resistance are also analyzed.