为提高海洋环境环氧(EP)涂层长效防腐蚀性能,选用蒙脱土(Mt)聚苯胺(PANI)复合物对环氧涂层进行改性,研究其耐蚀性能与机理.首先采用化学氧化法制备PANI和四种不同Mt含量的PANI复合物,然后以EP为成膜物质,在Q235钢上制备不同含量PANI-Mt100∶7的环氧复合涂层,通过红外光谱(FTIR),X射线衍射(XRD),扫描电镜(SEM)对PANI、PANI-Mt微观结构和形貌进行研究并利用电化学方法研究复合环氧涂层在3.5％ NaCl溶液中的腐蚀性能与机理.结果表明:改性环氧涂层在浸泡0.5h和360 h时的阻抗值分别为8.7×106Ω·cm2和6.3×104Ω·cm2,而掺入PANI-Mt100∶7后环氧涂层阻抗值明显增大,当PANI-Mt100∶7掺入量为5％(质量分数)时,环氧涂层在浸泡0.5 h和360 h时的阻抗值最大,分别为2.7×108Ω·cm2和1.1×107Ω·cm2.
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