某新型航空涂料海洋环境下耐蚀性试验研究

Experimental Research on Corrosion Resistance in Marine Environment of a New Aviation Coating

为考核某新型航空电泳涂料海洋环境下耐蚀性,设计了模拟海洋环境的仿真加速腐蚀试验方案,依据试验方案开展该新型涂料试件的8个当量日历年限的加速腐蚀试验,并对每个年限后预腐蚀涂料试件再开展电化学腐蚀试验,结合宏观腐蚀形貌观测分析与电化学阻抗分析技术,对上述两种试验结果进行分析,探究涂料在典型海洋环境下的腐蚀行为。研究发现:涂料在第6个当量日历年限后在试件边缘部位开始出现变色、起泡,后逐渐加重。与之对应的是阻抗模值|Z|_(0.1 Hz)从第2周期状态下的4.46×10^(4)Ω·cm^(2)逐渐衰减到第8周期时的2.10×10^(4)Ω·cm^(2),说明涂料的防护性能呈下降趋势变化。

In order to investigate the corrosion resistance in marine environments of some new aviation electrophoretic coating,an emulation accelerated corrosion experiment scheme is designed to simulate the marine environment.The accelerated corrosion test of the new coating test parts with eight equivalent calendar years was conducted according to the experimental scheme,and carry out electrochemical corrosion experiment with every Pre-corrosion coating test block after each calendar years.Combine observation analysis of the macroscopic corrosion morphology and electrochemical impedance analysis,the corrosion behavior of coating in typical marine environments is explored with the results of both experiments.The research shows:After experiencing 6 equivalent calendar years experiments,the edge of the test blocks began to appear discoloration and foaming,and then gradually aggravated.Corresponding to this,the impedance mode value(|Z|_(0.1 Hz))4.46×10^(4)Ω·cm^(2) of the second cycle gradually decreases to 2.10×10^(4)Ω·cm^(2) of the eighth cycle.It shows that the protective performance of the coating is downward trend.