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The long-term corrosion performance and adhesion properties of 7B04 aluminum alloy/anodic film/epoxy primer system in acidic NaCl solution
Materials and Corrosion ( IF 1.8 ) Pub Date : 2021-08-03 , DOI: 10.1002/maco.202112527
Yangguang Zhang 1 , Yueliang Chen 1 , Yong Zhang 1 , Guixue Bian 1
Affiliation  

The deterioration process and corrosion protective effect of 7B04 aluminum alloy/anodic film/epoxy primer system in acidic NaCl solution for 3024 h were investigated by optical/electron microscopes, electrochemical impedance spectroscopy (EIS), scanning Kelvin probe (SKP), and pull-off adhesion test. The results showed that the protective system of anodic film and epoxy primer can protect aluminum alloy from pitting corrosion after immersion for 2352 h. According to the response characteristics of EIS and SKP, different stages of the failure process could be identified. During the first 100 h of immersion, the water transport in the coating followed Fickian law, and the water diffusion coefficient was 2.03 × 10−11 cm2/s, which demonstrated that the coating has good impermeability. Anodizing and coating treatment improved the open circuit potential and impedance of 7B04 aluminum alloy and made the distribution of Volta potential more uniform. The decreasing rate of wet adhesion strength was first fast and then slow, which was similar to the variation rule of coating resistance. The anodic film enhanced the adhesion between epoxy primer and substrate so that the failure nature of the adhesion test was mainly the cohesive failure of the epoxy primer.

中文翻译:

7B04铝合金/阳极膜/环氧底漆体系在酸性NaCl溶液中的长期腐蚀性能和附着性能

采用光学/电子显微镜、电化学阻抗谱(EIS)、扫描开尔文探针(SKP)和拉-脱粘试验。结果表明,阳极氧化膜和环氧底漆保护体系可以保护铝合金在浸泡2352 h后免受点蚀。根据EIS和SKP的响应特性,可以识别失效过程的不同阶段。在浸泡的前 100 h 内,涂层中的水传输遵循 Fickian 定律,水扩散系数为 2.03 × 10 -11  cm 2/s,表明涂层具有良好的抗渗性。阳极氧化和涂层处理改善了7B04铝合金的开路电位和阻抗,使Volta电位分布更加均匀。湿附着强度的下降速度先快后慢,与涂层电阻的变化规律相似。阳极氧化膜增强了环氧底漆与基材之间的附着力,因此附着力试验的破坏性质主要是环氧底漆的内聚破坏。
更新日期:2021-08-03
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