Fatty Acids as Corrosion Inhibitors for Low Carbon Steel
Abstract
This research is to study the feasibility of two fatty acids, hexanoic acid (HA) and octanoic acid (OA),to be used as the corrosion inhibitors of low carbon steels in acid picking process. The concentrations of acids used in this work were 0, 1, 5 and 20 mM in 0.1 M H2SO4. The polarization curve showed that the corrosion potential (Ecorr) of carbon steel in H2SO4 contained OA shifted to negative (cathodic) direction. Thus, OA is a cathodic inhibitor controlling cathodic reaction chiefly. The corrosion rate also decreased with OA concentration. On the other hand, H2SO4 contained 20 mM HA showed a slightly shift of Ecorr to positive direction and reduce corrosion rate.In comparison with HA, OA at concentration of 20 mM exhibited highest inhibition efficiency (%IE) of 72.33% and lower corrosion rate of 88.95% when compared with the non-inhibitor condition.
Keywords : Corrosion Inhibitor, Fatty Acid, Hexanoic Acid, Octanoic Acid, Low Carbon Steel
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