高性能无铬钝化剂在铝材涂装上的应用

Development of High Performance Chromium-Free Passivation Agent Suitable for Coating of Aluminum Alloy and Optimization of Passivation Technology

开发了一种无铬、无磷、安全环保的钝化剂SF-563,其形成的高性能反应性转化涂层,涂装性能完全可以和六价铬钝化层媲美,非常适用于铝型材喷涂前的处理。最佳钝化工艺:2%SF-563,pH值2.5～3.5,处理时间60～90 s,钝化温度10～35℃。钝化后不需水洗,可直接干燥,最高干燥温度120℃。

An environmentally acceptable Cr-and P-free passivation agent SF-563 suitable for coating of Al wares was developed.The optimized passivation technology was established,and the properties of as-obtained passivation coating were evaluated.As the results,the optimized passivation parameters are suggested as bath concentration of 2%(mass fraction),pH value of 2.5～3.5,passivation time of 60～90 s,and passivation temperature of 10～35 ℃.Upon completion of passivation,the treated Al alloy surface does not need to be washed with water and can be directly dried at a maximum temperature of 120 ℃.Besides,the high-performance chemical conversion coating obtained under the optimized passivation parameters possesses excellent performance comparable to that of hexavalent Cr passivation coating,showing promising application in pre-treatment of Al alloy wares before coating.