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[目的]镁合金由于具有高比强度和低密度，被广泛用于3C电子产品及5G基站。然而镁合金耐蚀性较差制约了其进一步的应用，需要对镁合金进行适当的表面防护处理。[方法]通过蚀刻、漂白、化学转化、封闭等工艺，在镁合金表面制备了一种锆-钙-钒系复合转化膜。通过扫描电子显微镜(SEM)、能谱仪(EDS)、中性盐雾(NSS)试验、电化学工作站、直流电阻测试仪等手段对膜层的微观形貌、成分、耐蚀性及导电性进行了表征。[结果]原位转化处理后的镁合金表面形成了一层极薄的复合转化膜，动电位极化曲线和电化学阻抗谱(EIS)测试结果显示经转化处理后试样的膜电阻是未处理时的1.37倍，封闭后更增至2.10倍，且耐NSS时间超过48 h。蚀刻+漂白处理后镁合金的接触电阻从未处理时的0.711 mΩ略微下降至0.705 mΩ，而在转化+封闭处理后接触电阻仍维持在0.811 mΩ，展现出良好的导电性。[结论]该耐蚀-导电复合转化技术为镁合金在3C产品和5G基站领域中的应用提供了技术支持。
Abstract：[Objective] Magnesium alloys are widely used in 3C electronic products and 5G base stations due to their exceptional specific strength and low density. However, their inherent susceptibility to corrosion significantly impedes further applications, thereby necessitating effective surface protection strategies. [Method] A zirconium–calcium– vanadium composite conversion coating was prepared on magnesium alloy through etching, desmutting, chemical conversion, and sealing. The microstructure, elemental composition, corrosion resistance, and electrical conductivity of the conversion coating were characterized by scanning electron microscopy(SEM), energy-dispersive spectroscopy(EDS), neutral salt spray(NSS) testing, electrochemical measurements, and direct-current resistance measurement. [Result] An ultrathin composite conversion coating was formed on the magnesium alloy surface after in-situ conversion treatment. The results of potentiodynamic polarization and electrochemical impedance spectroscopic(EIS) measurements indicated that the film resistance of the treated specimen was increased to 1.37 times that of the untreated counterpart, further rising to 2.10 times after sealing, with withstanding NSS testing for over 48 hours. The contact resistance of the magnesium alloy slightly decreased from 0.711 mΩ(untreated) to 0.705 mΩ after etching and desmutting, and remained at 0.811 mΩ after chemical conversion and sealing, demonstrating excellent electrical conductivity. [Conclusion] The corrosion-resistant and conductive composite conversion technology provides technical support for the application of magnesium alloys in 3C products and 5G base stations.
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基本信息:
DOI：10.19289/j.1004-227x.2025.11.007
中图分类号:TG174.4
引用信息:
[1]张文丛,祝闻,刘宁华,等.镁合金表面原位耐蚀-导电复合转化膜制备与表征[J].电镀与涂饰,2025,44(11):41-48.DOI:10.19289/j.1004-227x.2025.11.007.
基金信息:
广东省普通高校特色创新项目(2023KTSCX147)