7005铝合金在模拟海水介质中的腐蚀行为研究

Corrosion Behavior of 7005 Aluminum Alloy in Simulating Marine Environment

以7005铝合金作为研究对象,借助电化学测量和重量法研究7005和5052铝合金在模拟海水介质中的耐腐蚀性,分析介质浓度、温度及浸泡时间等对其腐蚀行为的影响规律,为7系铝合金耐蚀性的判断提供实验依据。结果表明:7005与5052均产生明显的钝化特征,钝化电流随NaCl浓度的升高而增大。随温度升高,两种铝合金的腐蚀速率均加快,但增幅不同。两种铝合金表面均以点蚀为主要特征,腐蚀72h后,7005表面发生较为严重的局部腐蚀,其腐蚀程度高于5052。

Taking 7005 and 5052 aluminum alloys as the object of study, having gravimetric method and electrochemical measurement method adopted to investigate the corrosion resistance of 7005 and 5052 aluminum alloys in simulating sea water was implemented,including the influence law of the medium concentration,temperature and immersion time on the alloy’s corrosion to provide experimental basis for the corrosion resistance of 7 series aluminum alloys. The results show that,the 7005 and 5052 alloys have obvious passivation behavior and the passivation current density increases with the NaCl concentration. With the increasing of temperature,the corrosion rate accelerates,but the corrosion rate increases differently. Pitting corrosion is the main feature on the aluminum alloy surface. After 72 hours of corrosion,the serious local corrosion can be found on the surface of the 7005 aluminum alloy and the corrosion degree is higher than 5052 aluminum alloy.