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多巴胺(dopamine)是一种生物神经传递物质,在弱碱性水溶液条件下,能在溶解氧的作用下发氧化-交联反应,形成附着于固体材料表面的聚多巴胺复合层。基于这种特性,本文在铝合金表面制备一层聚多巴胺薄膜,使用扫描电镜和红外光谱对膜进行表征。在1 mol/L氯化钠溶液中使用极化曲线和交流阻抗谱(EIS)对其耐腐蚀性能进行分析。结果表明:在40℃,p H=8.5下反应24 h,铝合金表面形成一层聚多巴胺膜,电化学测试结果表明该膜对铝合金的耐腐蚀性能有一定的提高。
Dopamine (dopamine) is a biological neurotransmitter, in a weak alkaline aqueous solution under the action of dissolved oxygen oxidation - crosslinking reaction, the formation of attached to the solid material surface polydopamine composite layer. Based on this characteristic, a layer of polydopamine film was prepared on the surface of aluminum alloy, and the film was characterized by scanning electron microscopy and infrared spectroscopy. Its corrosion resistance was analyzed by polarization curve and electrochemical impedance spectroscopy (EIS) in 1 mol / L sodium chloride solution. The results showed that a layer of polydopamine film formed on the surface of aluminum alloy after reaction at 40 ℃ and p H = 8.5 for 24 h. The results of electrochemical tests showed that the film had a certain improvement on the corrosion resistance of aluminum alloy.