化学工程
介电谱
十二烷基苯
乳状液
傅里叶变换红外光谱
乳液聚合
导电聚合物
核化学
缓蚀剂
作者
Subrahmanya Shreepathi,Hung Van Hoang,Rudolf Holze
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2007-02-01
卷期号:154 (2)
被引量:17
摘要
Corrosion protection performance of a completely soluble polyaniline-dodecylbenzenesulfonic acid salt (PANI-DBSA) on C45 steel has been studied with electrochemical impedance and potentiodynamic measurements. Chloroform is the most suitable solvent to process the pristine PANI-DBSA because of negligible interaction of the solvent with the polyaniline (PANI) backbone. An anodic shift in the corrosion potential (ΔE = ∼ 70 mV), a decrease in the corrosion current, and a significant increase in the charge-transfer resistance indicate a significant anti-corrosion performance of the soluble PANI deposited on the protected steel surface. Corrosion protection follows the mechanism of formation of a passive oxide layer on the surface of C45 steel. In situ UV-vis spectroscopy was used to investigate the differences in permeability of aqueous anions into PANI-DBSA. Preliminary results of electron diffraction studies show that PANI-DBSA possesses an orthorhombic type of crystal structure. An increase in the feed ratio of DBSA to aniline increases the tendency of aggregation of spherical particles of PANI obvious in transmission electron microscopy. PANI-DBSA slowly loses its electrochemical activity in acid free electrolyte without undergoing degradation.
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