电化学聚合导电聚苯胺膜的研究

Preparation of Conductive Polyaniline Film by Electropolymerization

分析了恒电位法在酸性和碱性溶液中于不锈钢基体上电聚合聚苯胺的过程及其影响因素,测定了聚苯胺膜与基体的附着力、膜的导电性和防腐性。结果表明:该膜在空气中呈绿色,稳定、完整致密,导电性好,与基体的结合情况较好。阳极极化曲线测定表明,在碱性溶液中预镀后酸性溶液中聚合聚苯胺膜,其点蚀电位比酸性溶液中聚合聚苯胺膜升高1 V左右,表明前者的导电聚苯胺膜可显著提高不锈钢的抗点蚀性能,具有良好的点腐蚀防护效果。

Electropolymerization process of aniline in acidic and alkaline aqueous solutions and some in- fluential factors were investigated by potentiostatic method. The electropolymerization mechanism, binding force, conductivity and anticorrosion of polyaniline （PAn） film doped by different kinds of anions were explored. The experimental results showed that the electrochemically synthesized PAn film was green, stable and compact in the air. The anodic polarization curve of sample in sodium chloride solution showed that the pitting corrosion potential of stainless steel films with polyaniline coating, doped by several kinds of anions, increased about 1.0 V（vs SCE） , as compared to those with the polyaniline coating, doped by only a kind of anions. This indicated that the polyaniline coating could greatly improve the pitting corrosion resistance of stainless steel and had better prospect in corrosion protection of stainless steel.