摘要： 通过拉开法附着力测试、耐海水浸泡试验及电化学阻抗试验等方法,研究了铝合金不同表面处理工艺对防腐涂层耐蚀性能的影响。研究结果表明:打磨和钝化处理能大幅提高防腐涂层的附着力,附着力可达16~20 MPa,但涂层的模拟电阻值较低,海水浸泡5个月后,仅为(0.8~1.3)×10⁸ Ω;阳极氧化处理基材表面防腐涂层的附着力较低,仅为9 MPa,但基材的耐蚀性能有大幅提高,海水浸泡5个月后,涂层模拟电阻值仍可达(1.0~1.3)×10⁹ Ω。以上研究结果可为铝合金基材表面处理工艺的选择提供参考依据。

关键词: 铝合金, 防腐涂层, 表面处理

Abstract: The effect of surface treatment process on the corrosion resistance of aluminum alloy substrate is analyzed via pull-off test for adhesion, seawater immersion test and electrochemical impedance spectroscopy. The results show that grinding and passivation treatment can greatly improve the adhesion of anticorrosive coatings on substrate (approx. 16~20 MPa).But the simulation resistance of the coatings is reduced to(0.8~1.3)×10⁸ Ω after five-months seawater immersion test. However the adhesion of anticorrosive coatings on anodizing treatment aluminum alloy substrate is only 9 MPa but the corrosion resistance of the substrate is sIgnificantly Improved. Furthermore, the simulation resistance of the coatings can be increased up to(1.0~1.3)×10⁹ Ω after five-months seawater immersion. These results can serve as reference for surface treatment process of aluminum alloy substrate.

Key words: aluminum alloy, anticorrosion coating, surface treatment proces