电沉积Cu-Zn-SiO_2纳米复合镀层工艺及耐蚀性研究

Electrodeposition Technology and Corrosion Resistance of Cu-Zn-SiO_2 Nano Composite Coating

用电沉积方法在锌合金基体的表面制备Cu-Zn合金镀层和Cu-Zn-Si O2纳米复合镀层,采用扫描电镜(SEM)研究Cu-Zn合金镀层及其Cu-Zn-Si O2纳米复合镀层的表面形貌。采用络合滴定法和称重法确定掺杂纳米Si O2粉末的质量。采用浸泡法和电化学极化法(Tafel曲线)研究不同电镀时间的两类镀层在5.0wt%Na Cl和5.0wt%HCl溶液中的腐蚀行为。研究结果表明:纳米Si O2粉末的最佳掺杂量为2.0 g·L-1。通过与合金镀层比较,纳米复合镀层在5.0wt%Na Cl和5.0wt%HCl溶液中都表现出极好的耐腐蚀性能。此外,对不同施镀时间的纳米复合镀层耐蚀性能进行比较,最终确定适度最佳时间为4.0 min。

Cu- Zn alloy coatings Cu- Zn- Si O2 nano composite coatings were electrodeposited on zinc alloy.The surface morphology of the Cu- Zn alloy coatings and Cu- Zn- Si O2 nano composite coatings were determined by SEM. The mass of nano Si O2 powder was determined by the weighing method and the coordination titration.The corrosion behavior of the coatings in 5. 0 wt% Na Cl and 5. 0 wt% HCl solutions was investigated using sodium chloride immersion test and electrochemical polarization method（ tafel curve）. The results indicated that the optimal mass of nano Si O2 powder was 2. 0 g· L- 1. The composite coatings had the perfect corrosion resistance.In addition,the corrosion behavior of the different coating time was investigated and the most appropriate time was4. 0 min.