Al和Mg對鋅合金鍍液抗高溫氧化性能的影響

Influence of Al and Mg on High-temperature Oxidation Resistance of Zinc Alloy Electroplating Solution

摘要: 制備8種不同Al、Mg含量的鋅合金鍍液，采用SEM、XRD等分析方法，研究Al和Mg元素對鋅合金鍍液表面氧化的影響。結(jié)果表明：Mg含量增加會加劇鍍液表面的氧化，而Al含量增加會抑制鍍液表面氧化；在Mg含量為0.5%的合金鍍液中，當(dāng)Al含量≥0.1%時，氧化膜層中出現(xiàn)混合氧化物MgAl₂O₄相，減少了氧化膜層中MgO的含量；Mg含量為0.5%的鍍液中添加0.075%的Al，其鍍層具有良好的耐高溫氧化性。

Abstract: The influences of Al and Mg on surface oxidation of zinc alloy electroplating solutions are studied by SEM and XRD methods, using 8 kinds of zinc alloy electroplating solutions with different Al and Mg contents.The results indicate that increasing of Mg will aggravate oxidation of the electroplating solutions, while increasing of Al will do the opposite.In an alloy electroplating solution with 0.5%Mg, when Al is ≥ 0.1%, mixed oxides MgAl₂O₄phase appears in the oxide film, which will reduce MgO in the film.Adding 0.075%Al to an electroplating solution with 0.5%Mg will bring a plating film with good high temperature oxidation resistance.