Abstract
The electrochemical behaviour of 2-dimethylaminoethanol (DMA) on the corrosion of Type 304 austenitic stainless steel in dilute hydrochloric solution was investigated through a weight-loss technique, open circuit potential measurement and potentiodynamic polarization tests at specific concentrations of DMA. Results show the compound to be highly effective with a maximum inhibition efficiency of 79 % from weight loss analyses and 80.9 % from polarization tests at 12.5 % DMA. The mean corrosion potential of −321 mV, obtained from open circuit potential measurement is within passivation potentials. DMA inhibition protection was determined to occur through a physicochemical reaction mechanism on the steel surface, confirmed from calculated thermodynamic values. DMA obeyed the Langmuir isotherm model. Data obtained for inhibition efficiency from the three test techniques are in reasonably good agreement. The potentiodynamic test showed that the compounds acted as a cathodic type inhibitor.
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