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提出同时利用聚苯胺的导电性、化学与电化学稳定性对金属进行防腐保护的设想。探索用电化学方法在不锈钢阳极上,从酸性苯胺溶液中合成致密的导电聚苯胺膜的条件。通过极化曲线测量得知,在3％NaCl和0.5mol/1H_(2)SO_(4)溶液中其腐蚀电位均为正值(相对于饱和甘汞电极),比不锈钢基体正移了约(0.2～0.7)V,腐蚀电流比304不锈钢或一般碳钢约小3个数量级。当电位达到0.65V(在3％NaCl溶液中)或0.9V在0.5mol/1H_(2)SO_(4)中),聚苯胺膜会因过氧化而溶解脱落。在1mol/1HCl溶液中,聚苯胺膜不能改善样品的耐腐蚀性能。
Proposed the use of polyaniline conductivity, chemical and electrochemical stability of the metal corrosion protection ideas. The conditions of electrochemical synthesis of dense conductive polyaniline films from acidic aniline solution on stainless steel anodes were explored using electrochemical methods. Polarization curve shows that the corrosion potential of positive electrode (relative to saturated calomel electrode) in positive solution of 3% NaCl and 0.5mol / 1H_ (2) SO_ (4) 0.2 ~ 0.7) V, the corrosion current is about 3 orders of magnitude smaller than that of 304 stainless steel or ordinary carbon steel. When the potential reached 0.65V (in 3% NaCl solution) or 0.9V in 0.5mol / 1H_ (2) SO_ (4)), the polyaniline film would dissolve and peel off due to over-oxidation. In 1mol / 1HCl solution, polyaniline film can not improve the corrosion resistance of the sample.