SONG Zhengwei*,DING Lifeng,WANG Peilin,et al.Preparation and Corrosion Resistance of Ni-P/Cu-Zn Super-Hydrophobic Composite Coating on the Surface of Mg Alloy[J].Plating & Finishing,2021,(7):10-14.[doi:10.3969/j.issn.1001-3849.2021.07.002]
镁合金表面Ni-P/Cu-Zn超疏水复合涂层制备及耐蚀性研究
- Title:
- Preparation and Corrosion Resistance of Ni-P/Cu-Zn Super-Hydrophobic Composite Coating on the Surface of Mg Alloy
- 文献标志码:
- A
- 摘要:
- 本文主要研究了镁合金表面Ni-P/Cu-Zn超疏水复合涂层的制备和耐蚀性。复合涂层通过化学镀镍磷、电镀铜锌合金、阳极氧化、表面修饰后获得，化学镀Ni-P层为内层，电镀Cu-Zn层为中间层，超疏水层为外层。对复合涂层的结构和性能进行了表征。实验结果表明，复合涂层与基底结合力强，无鼓泡脱落现象，涂层厚度约为34 μm。Ni-P/Cu-Zn涂层氧化后表面形成微纳米结构，用十八烷基硫醇修饰后的涂层具有优良的超疏水性，水的表面接触角约为155°，涂层的自腐蚀电流密度相对于未修饰涂层和基底下降1~2个数量级，阻抗大幅提升，说明涂层具有很好的耐蚀性，能够为镁合金提供较好的保护。
- Abstract:
- The preparation and corrosion resistance of Ni-P/Cu-Zn super-hydrophobic composite coating on the surface of magnesium alloy was studied in this paper, the composite coating was obtained via electroless Ni-P plating, Cu-Zn alloys plating, anodic oxidation, and surface modification processes, electroless Ni-P as inner layer, electroplating Cu-Zn alloys as interlayer and super-hydrophobic coating as outer layer. The structure and properties of composite coating were characterized. The test results shown that the obtained composite coating has strong binding force with the substrate, no bubbling and falling off phenomenon was detected, the thickness of coating was about 34 μm. Micro/nano structure was formed on the surface of Ni-P/Cu-Zn coating after anodic oxidation treatment. The coating modified by octadecanethiol showed excellent super-hydrophobicity with a water contact angle of about 155°, the corrosion current density （icorr） of the modified coating decreases by 1-2 orders of magnitude relative to the unmodified coating and substrate, and the impedance was greatly improved, which indicates that the coating has good corrosion resistance which can provide better protection for magnesium alloys.
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备注/Memo
收稿日期： 2020-07-25；修回日期： 2020-10-10
*通信作者： 宋政伟，adsszw@163.com.
基金项目： 山西省教育厅科技创新项目（2020L0656）