Emeraldine base conducting polymer coatings for protection of steels against corrosion

'Department of Chemistry, West Chester University, West Chester, Pa 19383-2115
Research & Development Center, Saline Water Conversion Corporation, P.O. Box 8328,
Al-Jubail 31951, Saudi Arabia
E-mail : rdc@swcc.gov.sa
Manuscript received 11 July 2006, accepted 8 December 2006

Open circuit potential (OCP) and potentiodynamic polarization studies were conducted to study the corrosionbehavior of emeraldine base coating on AISI 1018 steel in water, sea water, 5% NaCl and 0.1 M HCl.

OCP studies in different media indicate a positive shift in the Ecorr of coated steel which is maintained for a long time. A positive shift in E_corr indicates protective action of the polymer coating. Electrochemical potentiodynamic polarization studies for coated and uncoated steel in HCl show lower corrosion rates for emeraldine base coated steel, an authentic evidence regarding the protection offered by emeraldine base coating in HCI.