Electrochemical Studies of the Inhibition Effect of 2-Dimethylaminoethanol on the Corrosion of Austenitic Stainless Steel Type 304 in Dilute Hydrochloric Acid
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Springer
Abstract
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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.
Keywords
T Technology (General), TJ Mechanical engineering and machinery