以导电聚苯胺为防腐颜料制备水性环氧防腐涂层,用光学显微镜观测聚苯胺在水性环氧中的分散性,用电化学阻抗谱(EIS)、极化曲线分析(LSV)、盐雾试验以及X衍射光谱(XRD)表征涂层的防腐性能,研究了聚苯胺(PANI)添加量对水性环氧树脂涂层防腐性能的影响.结果表明,在涂层中引入导电聚苯胺使涂层具有一定的导电性.随着聚苯胺添加量的增加涂层导电性提高,将金属腐蚀产生的电子导到涂层与溶液的界面上,隔离阴阳极间的反应,形成完整的金属表面氧化膜.同时,聚苯胺对金属离子的螯合作用和对氧气的屏蔽提高了涂层的抗“闪锈”能力和防腐效果.但是,聚苯胺添加量过大(达到0.8％)使涂层后期的屏蔽腐蚀离子效果明显降低,使防腐作用主要依赖氧化膜,涂层综合防腐效果降低.聚苯胺添加量(质量分数)为0.6％时聚苯胺在水性环氧中分散效果好,金属表面涂层的氧化膜均匀,具有最好的抗“闪锈”能力和防腐性能.
The waterborne anti-corrosion paint was prepared by introducing the anti-corrosion pigment of conductive polyaniline (PANI) to the waterborne epoxy.Adding quantity (mass fraction) of PANI was 0,0.2％,0.4％,0.6％,0.8％,respectively.The dispersion and anti-corrosion effect were characterized with optical microscopic,electrochemical impedance spectroscopy (EIS),polarization curve analysis (LSV),X-ray diffraction (XRD),and salt spray test.The effects of the quantity of PANI on the anti-corrosion property of the waterborne anti-corrosion paint were investigated.The anodic and cathodic reaction can be insulated because of the suitable PANI adding,and the metal chelating substance and the shielding effect of oxygen are helpful.Metal oxide film formed intactly and the coating "flash" rust resistance and anti-corrosion effect can be improved.But when the adding amount of PANI was 0.8％,the effect of anti-corrosion decreased because the shielding the corrosion ions of the epoxy film decreased.The anticorrosion property is the best when the quantity of PANI was 0.6％.The PANI can improve the quality of the oxidation film,and overcome the "flash rust" problem effectively.
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