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探讨了锌系磷化液中主要的成膜物质ZnO的质量浓度对AZ61镁合金磷化膜的微观结构和性能的影响.利用金相显微镜、扫描电镜、能谱分析仪观察和分析了磷化膜的结构、表面形态和组成成分,并通过阳极极化曲线测量评价了磷化膜的耐腐蚀性能.结果表明:在低ZnO质量浓度的磷化液中,获得的磷化膜比较疏松且不完整,其并未表现出优异的耐腐蚀性;在高ZnO质量浓度的磷化液中,得到的磷化膜晶粒较粗大,厚度不均匀,耐腐蚀性不佳;在中等ZnO质量浓度2.0 g/L的磷化液中,得到了均匀、完整的磷化膜层,极化曲线测量表明了其在质量分数为3.5%NaCl溶液中具有较好的耐腐蚀性.
The effect of the mass concentration of ZnO, which is the main film-forming substance in the zinc phosphating solution, on the microstructure and properties of the AZ61 magnesium alloy phosphate coating was investigated. The morphology and properties of AZ61 magnesium alloy phosphate coating were investigated by metallography, SEM and EDS. The structure, surface morphology and composition of the films were measured and the corrosion resistance of the films was evaluated by the anodic polarization curves.The results show that the phosphating films obtained in the low concentration ZnO solution are relatively loose and not Complete, it does not show excellent corrosion resistance; phosphating solution obtained in the high concentration of ZnO phosphatizing film coarse, uneven thickness, poor corrosion resistance; medium ZnO concentration of 2.0 g / L phosphating solution, a uniform and complete phosphate coating was obtained. The measurement of the polarization curve showed that it had good corrosion resistance in 3.5% NaCl solution.