摘要
采用循环伏安法,在含吡咯和苯胺的0.3 mol/L草酸水溶液中制备了聚吡咯/聚苯胺(PPy/Pani)的复合型导电聚合膜。采用红外光谱、极化曲线、自腐蚀电位-时间曲线、扫描电子显微镜和电化学阻抗谱研究了共聚膜的防腐蚀性能。结果表明,在1 mol/L H2SO4中,PPy、Pani与不锈钢基体发生氧化还原反应,促进不锈钢表面发生钝化;当苯胺与吡咯浓度比为1∶3时,制备得到的复合型导电聚合膜所保护的不锈钢自腐蚀电流最小,自腐蚀电位最高,保护时间最长。PPy、Pani及其共聚膜在3.5%NaCl溶液中电化学阻抗谱表明,所制备的PPy、Pani及其共聚物膜与不锈钢基体发生氧化还原反应,使其表面钝化;当Cl-到达不锈钢表面时,破坏钝化膜导致不锈钢腐蚀。
Composite conductive polymers consisting of polypyrrole （PPy） and polyaniline （Pani） were synthesized successfully using cyclic voltammetry technique with 0. 3 mol/L oxalic acid in the corresponding monomer solutions. The properties of the anticorrosion assembled with conducting polymers were investigated by IR, polarization curve, SEM, electrochemical impedence spectroscopy and free corrosion potentials. The result has shown that in 1 mol/L H2SO4, composite conductive polymers have the redox reaction with the stainless steel substrate, deactivating the stainless steel surface. When the molar ratio of aniline and pyrrole is 1：3, the prepared composite conductive polymers protect stainless steel with the minimum corrosion current, the highest corrosion potential, and the longest protected time. Electrochemistry impedance measurements indicate that the polypyrrole and polyaniline have the redox reaction with the stainless steel substrate, promoting the stainless steel surface passivation; however, the deactivated membrane may be destroyed and cause the stainless steel to be corroded when Cl- diffuses to the stainless steel surface.
出处
《应用化学》
CAS
CSCD
北大核心
2013年第2期203-207,共5页
Chinese Journal of Applied Chemistry
关键词
聚苯胺
聚吡咯
复合型导电聚合膜
不锈钢
防腐蚀
polyaniline, polypyrrole, composite conductive polymers, stainless steel, anti-corrosion
