化学氧化合成N-乙基苯胺与苯胺共聚物的防腐性能

通过开路电位法详细研究了掺杂酸种类、掺杂状态和共聚单体摩尔比等对化学氧化合成的N-乙基苯胺与苯胺(EA/AN)共聚物的防腐性能的影响。结果表明,所有EA/AN共聚物的防腐性能均优于两种单体的均聚物,单体喂入摩尔比EA/AN为20/80的去掺杂态共聚物表现出最优防腐效果。盐酸掺杂共聚物的防腐性能优于其它酸掺杂共聚物的,去掺杂态共聚物又优于掺杂态共聚物。尤其是在强酸性腐蚀介质中,以该共聚物为底漆,环氧树脂为面漆的复合涂层钢板的开路电位在浸泡过程中出现了不降反升现象,涨幅达110 mV左右,较裸露钢板相应正移了约545 mV,较聚苯胺复合涂层涂覆的钢板相应正移了约90 mV,在长达半年的浸泡后,涂层不脱落、不起泡,也无锈点出现。

Corrosion Behavior of Chemically Composite Poly(N-ethylaniline-co-aniline)

Effect of state doped acid,and feed molar ratio on corrosion performance of chemically prepared copolymer coating from aniline(AN)and N-ethylaniline(EA)has been investigated by open-circuit-potential(OCP)measurements.The results showed that the poly(anilineco-N-ethylaniline)coatings provided more effective corrosion protection to medium-carbon steel than the respective homopolymers,in which the copolymer coating with feed molar ratio of 20/80 possessed best anti-corrosion performance.The HCl doped coplymer showed better performance than the other acid doped coplymer.The dedoped coplymer showed better performance than doped coplymer.Especially in strong acid aqueous solution,the OCP value of the copolymer coposite coating with EA/AN dedoped copolymers as primer and epoxy resin as top coating did not decline but increase with soaking time.The enhancment in OCP reached to ca.110mV,which was positive shift ca.545mV based on bare steel,and positive shift ca.90mV based on polyaniline coating.After dipped in the corrosion media for half a year,the coatings were still smooth and did not peeled,and no blister and rust spot appeared.