Abstract:
Electrochemical properties and corrosion inhibition of sodium benzoate on Zinc alloys
were studied in seawater and acidic solutions at room temperature. Weight loss and
electrochemical properties of zinc alloys as well as adsorption and their surface
morphology in the presence of sodium benzoate were investigated. Weight loss
experiment involving immersion of alloys in seawater and in acidic solutions was
conducted for 30days on all the samples. The effects of dissolved oxygen in
environmental air circulation on the alloys in seawater were also investigated. The
corrosion products and the microstructure on the Zinc alloys were characterized using
Scanning Electron Microscope (SEM). Results obtained in this study indicated that
weight loss and electrochemical measurement for zinc alloys in seawater and acidic
solutions after varied immersion period showed that in the presence of sodium benzoate,
the corrosion current densities and corrosion rates of the alloys were significantly
decreased and at the same time the inhibition efficiency, IE (%) were increased. The
results also revealed that the weight losses of the alloys in sulphuric acid were higher
compared to that of in the acetic acid. The presence of more dissolved oxygen in air
circulation in the environment contributed to the dissolution of Zinc alloys. Corrosion
rate is being calculated from the data and the results collected from the immersed Zinc
alloys samples' weight loss in the acidic solutions and seawater. The results from SEM
study elucidated that in the presence of sodium benzoate, after immersion in seawater, a
thin film was formed on the specimen surface.
