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以磷酸二氢锰和无氟、无铬、无亚硝酸盐的添加剂为主要成分,通过化学沉积的方法在镁合金AZ31表面获得致密均匀的耐蚀磷化膜。通过硫酸铜点蚀测试、SEM、XRD及电化学极化曲线等表征手段,详细研究了膜层的形貌、组成、相结构及耐蚀性能,讨论了成膜温度和游离酸对膜层微结构、形貌及耐蚀性能的影响。结果表明,磷化膜通过抑制阳极溶解和阴极析氢,有效地提高了镁合金AZ31的耐蚀性能。
With dihydrogen phosphate and fluorine-free, chromium-free, nitrite-free additives as the main component, by chemical deposition method AZ31 magnesium alloy surface to obtain a dense and uniform anti-corrosion phosphate coating. The morphology, composition, phase structure and corrosion resistance of the coatings were studied in detail by means of pitting test of copper sulfate, SEM, XRD and electrochemical polarization curves. The influence of film formation temperature and free acid on the micro Structure, morphology and corrosion resistance. The results show that the phosphate film can effectively improve the corrosion resistance of magnesium alloy AZ31 by inhibiting the dissolution of anodes and hydrogen evolution of cathodes.