Electrochemical and XPS Investigation of Phthalocyanine Oligomer Sulfonate as a Corrosion Inhibitor for Iron in Hydrochloric Acid
- 1 January 2008
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 155 (10) , C515-C520
Abstract
A water soluble and metal free phthalocyanine oligomer sulfonate (H2PPc⋅(SO3Na)x)(H2PPc⋅(SO3Na)x) has been synthesized and its corrosion inhibitive effect has been investigated by potentiodynamic measurement, ac impedance, and surface analysis. The potentiodynamic parameters show that H2PPc⋅(SO3Na)xH2PPc⋅(SO3Na)x can effectively reduce the corrosion current density and inhibit the corrosion of iron in 1molL−11molL−1 HCl at 313K313K . The H2PPc⋅(SO3Na)xH2PPc⋅(SO3Na)x functions as a mixed type inhibitor with anodic suppression outweighing the cathodic one. The ac impedance result, which is shown in the form of a compressed capacitive semicircle on complex plots, demonstrates that charge transfer resistance RctRct increases with the increase in concentration of H2PPc⋅(SO3Na)xH2PPc⋅(SO3Na)x in acidic solution. The X-ray photoelectron spectroscopy (XPS) result indicates the presence of the electronic donor-acceptor between Fe atoms and front molecular orbital of H2PPc⋅(SO3Na)xH2PPc⋅(SO3Na)x , evidence that the H2PPc⋅(SO3⋅Na)xH2PPc⋅(SO3⋅Na)x forms an adsorption layer on iron surface via chemical adsorption to protect iron from erosion in acid.Keywords
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