engleski

Preparation and characterization of self-assembled monolayer of stearic acid for protection of cupronickel alloy

Cupronickel alloys are often used for marine applications due to their good corrosion resistance to seawater. However, corrosion may be facilitated in the presence of pollution or biofouling and additional protection may be needed. The aim of this work was to investigate the possibility of protection of cupronickel in near neutral chloride media. For that reason stearic acid was used as an environment friendly corrosion inhibitor that may form a protective hydrophobic layer on the metal surface. In order to obtain high corrosion protection properties various methods of surface pretreatment were examined (various inhibitor concentrations, adsorption duration, reduction of cupronickel oxide layer or surface covered with oxide layer). Stability and efficiency of such obtained protective monolayers of stearic acid were examined by the means of electrochemical methods (polarization measurements and electrochemical impedance spectroscopy) as well as by contact angle measurements. Results obtained in this work confirm that stearic acid may significantly decrease corrosion rate of cupronickel alloy in chloride media.

corrosion inhibitor; self-organizing monolayer

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