摘要
采用硫酸-柠檬酸电解液,通过改变电压(10 V~22 V)在2024铝合金表面生成不同氧化膜,研究电压对氧化膜的微观形貌和耐蚀性能的影响。结果表明:在不同电压下生成的氧化膜都呈多孔状形貌,明显不同于铝合金的微观形貌。随着电压升高,氧化膜表面的微孔孔径和致密性发生明显变化,厚度呈现先增加后降低的趋势。不同电压下生成的氧化膜耐蚀性能都好于2024铝合金的。在10 V~18 V范围内,随着电压升高,氧化膜的耐蚀性能逐步提高,对铝合金起到良好的保护作用,但当电压继续升高达到22 V时,氧化膜的耐蚀性能下降,对铝合金的保护作用减弱。电压为18 V时生成的氧化膜最厚且致密性较好,展现出更好的耐蚀性能,其电荷转移电阻和阻抗模值分别达到1.86×1O^(4)Ω·cm^(2)、3239.7.cm^(2),对铝合金的保护效率最高,接近于95%。
Different oxidation films were formed on 2024 aluminum alloy by changing the voltage(10 V-22 V)using sulfuric acid-citric acid electrolyte,and the influence of voltage on the microstructure and corrosion resistance of oxidation films was studied.The results show that the oxidation films formed at different voltages show porous morphology,which is obviously different from that of aluminum alloy.With the increase of voltage,the pore diameter and compactness of oxidation films change obviously,and the thickness is increased first and then decreased.The corrosion resistance of oxidation films formed at different voltages is better than that of 2024 aluminum alloy.With the increase of voltage in the range of 10 V-18V,the corrosion resistance of oxidation films is gradually improved,which plays a good role in protecting the aluminum alloy.However,when the voltage is increased to 22 V,the corrosion resistance of oxidation films is decreased,and the protective effect on aluminum alloy is weakened.When the voltage is 18 V,the oxidation film has the maximum thickness and better compactness,and exhibits better corrosion resistance;its charge transfer resistfilm to aluminum alloy is the highest,close to 95%.
作者
李小庆
唐楷
林东
LI Xiao-qing;TANG Kai;LIN Dong(Department of Chemical Engineering,Chongqing Chemical Industry Vocational College,Chongqing 401220,China;Department of Chemical Engineering,Sichuan University of Science and Engineering,Zigong 643000,China)
出处
《轻合金加工技术》
CAS
2021年第9期46-51,共6页
Light Alloy Fabrication Technology
基金
2020年重庆市教委科研课题(KJQN202004504)。
