直流杂散电流对环氧树脂涂层浸泡失效的影响

Effect of Direct Stray Current on Degradation of Epoxy Resin Coating in Immersion

利用浸泡试验、电化学测试等技术研究了直流杂散电流对环氧树脂涂层在不同pH和氯离子环境中浸泡失效的影响。结果表明:施加直流干扰会加速环氧树脂涂层失效,在1~5 V直流干扰情况下,随着直流干扰电压的增大,该涂层的吸水量增加,失效更加严重;在直流干扰电压为3 V的中性环境中,该涂层的吸水量最大,但在酸性环境中环氧树脂涂层更容易失效;随着氯离子含量的增大,涂层失效情况加剧,而吸水量呈现先增大后减小的趋势。

The effect of direct stray current on the degradation of epoxy resin coating in the environment with different pH values and chloride ion concentrations was studied by immersion test and electrochemical testing. The results show that the degradation of epoxy resin coating in the presence of direct current was accelerated. As the direct current（ DC） interference voltage increased in the range of 1-5 V,the water absorption of the coating increased and the degradation was more serious.At DC interference voltage of 3 V the coating got the largest water absorption in neutral environment,but the degradation of the coating failed more easily in acidic environment. With the increase of chloride ion concentration the degradation of the coating became more serious and the water absorption increased first and then decreased.