DANG Zaiqing*.Study on the Structure and Properties of Composite Coating on Magnesium Alloy[J].Plating & Finishing,2020,(11):16-19.[doi:10.3969/j.issn.1001-3849.2020.11.0040]
镁合金复合镀层的制备及其结构与性能表征
- Title:
- Study on the Structure and Properties of Composite Coating on Magnesium Alloy
- 文献标志码:
- A
- 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/cm2，降低至1.26×10-6 A/cm2，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。
- Abstract:
- 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 nickel plating has increased 0.869 V. Furthermore, the corrosion current is reduced from 1.24 × 10-4 A/cm2, to 1.26 × 10-6 A/cm2, and the self-corrosion current density is reduced by two orders of magnitude compared to the substrate, indicating that the coating has better corrosion performance in the static corrosion immersion experiment.
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备注/Memo
收稿日期： 2020-03-21；修回日期： 2020-05-29
通信作者： 党在清，zhongguo520_1314@163.com