摘要
以AZ91D镁合金为基体材料,采用有机涂膜预处理后,化学镀Ni-P、电镀Ni,制备了有机涂膜/Ni-P/Ni三层复合镀层。利用SEM、XPS、EDS等检测方法,电位动力学极化曲线研究了镀层可靠性及耐腐蚀性。结果表明:有机涂膜/Ni-P/电镀Ni复合镀层维氏硬度达到355 HV,复合镀层的临界破坏载荷Fc为91 N;镀镍后镁合金自腐蚀电位提高了0.869 V,腐蚀电流从1.24×10^-4 A/cm^2,降低至1.26×10^-6 A/cm^2,自腐蚀电流密度较基体降低了两个数量级,表明镀层在静态腐蚀浸泡实验中具有较好的耐腐蚀性能。
Three-layer composite organic coating/Ni-P/Ni was prepared on AZ91D magnesium alloy by spray pretreatment,electroless plating and electroplating nickel.The reliability analysis and corrosion resistance of coatings were investigated through SEM,XPS,EDS and potential kinetic polarization curve test method,respectively.The results show that the zinc pretreatment can make the coating more smooth and uniform.The vickers hardness of Ni-P/Ni composite coating can reach 355 HV.The critical failure load of composite coating is about 91 N.The corrosion potential of the magnesium alloy after nick⁃el plating has increased 0.869 V.Furthermore,the corrosion current is reduced from 1.24×10^-4 A/cm^2,to 1.26×10^-6 A/cm^2,and the self-corrosion current density is reduced by two orders of magnitude com⁃pared to the substrate,indicating that the coating has better corrosion performance in the static corrosion immersion experiment.
作者
党在清
DANG Zaiqing(Shanxi vocational college of engineering,tanghuai campus,xinzhou 030000,China)
出处
《电镀与精饰》
CAS
北大核心
2020年第11期16-19,共4页
Plating & Finishing
关键词
镁合金
预处理
复合镀镍
结合强度
magnesium alloy
pretreatment
composite nickel plating
adhesive strength
作者简介
通信作者:党在清,zhongguo520_1314@163.com。
