热处理温度与6063铝合金化学镀镍层的耐蚀性

Effect of Heat Treatment Temperature on Corrosion Resistance of Electroless Nickel Plating on 6063 Aluminum Alloy

试验研究了不同热处理温度对6063铝合金化学镀镍层的耐腐蚀性能的影响。采用扫描电镜(SEM)和能谱分析仪(EDS)分析了镀镍层的表面微观形貌和成分;采用电化学工作站测试了不同热处理温度下6063铝合金化学镀镍层在3.5%NaCl溶液和4%NaOH溶液中的阳极极化曲线。结果表明,化学镀镍处理后其表面获得了致密的含磷量12.89%的高磷镀层;该镀层在673 K热处理后耐腐蚀性能最好。

The effects of various heat treatment temperatures on the corrosion resistance of electroless nickel plating on 6063 aluminum alloy were investigated. The morphology and phosphorus content of the electroless nickel coatings were studied by SEM and EDS. The corrosion resistance of the coatings before and after heat treatment were studied by potentiodynamic polarization curves both in 3. 5% NaCl and in 4% NaOH solution. Results showed that electroless nickel films were homogeneous and compact, and had high phosphorus content. The films had the best corrosion resistance both in 3.5% NaCl and in 4% NaOH solution after heat treatment at 673 K.