热处理对Al-Sn-Bi-Pb-In阳极材料电化学及腐蚀性能的影响

Influences of Heat Treatment on Electrochemical Performances and Corrosion Behaviors of Al- Sn- Bi- Pb- In Alloy Anodes

热处理能提高铝合金的耐蚀性,但高温固溶会降低其电化学活性,低温回火会影响其耐蚀性,目前结合二者优势的报道较少。熔炼制备了Al-Sn-Bi-Pb-In合金,采用电化学方法和化学浸泡失重法研究了高温固溶、低温回火热处理对其电化学性能及耐蚀性能的影响;采用扫描电镜观察了不同热处理状态铝合金腐蚀后的表面形貌。结果表明:铝合金阳极高温固溶处理后电化学活性降低,耐蚀性提高;再作低温回火后铝合金阳极电化学性能提高,耐蚀性稍有降低;最佳热处理为500℃固溶6 h之后再在150℃下回火8 h。

Al- Sn- Bi- Pb- In alloy anode material was prepared by melting.The influences of high temperature solid solution and low temperature tempering on electrochemical performances and corrosion resistance of Al alloy anode were investigated by electrochemical measurements and chemical immersion tests.Scanning electron microscopy was used to observe the surface morphologies of the corroded Al alloys with different heat treatment modes.Results showed that the electrochemical performance of alloy anode was decreased while the corrosion resistance was improved after high temperature solution treatment.After the following tempering treatment,the electrochemical performance of alloy anode was improved while the corrosion resistance had a slight decline.The best heat treatment process was the solution treatment at 500 ℃for 6 h and followed by the tempering treatment at 150 ℃ for 8 h.