磷化处理对AZ63镁合金化学镀Ni-P的影响

Effect of Phosphating Interlayer on Properties of Ni-P Coating on AZ63 Magnesium Alloy

为了提高AZ63镁合金表面化学Ni-P镀的质量,本文在AZ63镁合金表面分别进行了Mn系和Zn系磷化处理,然后进行化学镀Ni-P的研究,利用扫描电子显微镜(SEM)、能谱仪(EDS)等测试方法分析镍磷镀层的形貌、成分、镍磷含量和耐蚀性得到以下结论:AZ63镁合金经Mn系或Zn系磷化处理后化学镀均可得到致密、厚度均匀的Ni-P镀层,Ni-P镀的速率达到25 um/h以上;Zn系磷化中间层化学Ni-P镀的镀速高于Mn系磷化中间层的化学Ni-P镀速。磷化处理的中间层主要影响Ni-P镀层的P的含量,非晶态结构,镀层硬度和耐蚀性;Ni-P镀层中P含量越低,耐蚀性越差。

In this work,in order to improve the properties of Ni-P coating on AZ63 magnesium alloy,the phosphating treatment of Mn series and Zn series was prepared between the Ni-P coating and the alloy.Scanning electron microscope(SEM),Energy Disperse Spectroscopy(EDS)and other test methods have been used to characterize and analyze the morphology,the composition,the content of Ni and P and the corrosion resistance of Ni-P coating.The result indicated that:the Ni-P coating with dense structure and uniform thickness could be obtained after both Mn series and Zn series phosphating treatment on AZ63 magnesium alloy.The plating rate of Ni-P coating on AZ63 magnesium alloy can reach above 25μm/h.While,the plating rate of Zn series was higher than that of Mn series.The main effects of phosphating interlayer on the Ni-P coating are the content of P,amorphous structure,the hardness and corrosion resistance.The lower P content in Ni-P coating,the corrosion resistance of the Ni-P coating was reduced.