Abstract
Beta-dimethylaminoethyl alcohol was investigated for its inhibition performance on low carbon steel corrosion in 0.5MHCl solution. Results show the organic compound effectively suppressed the redox electrochemical mechanism responsible for corrosion with highest inhibition value of 89.07% and 97.05% from weight loss measurement and potentiodynamic polarization technique. Polarization plots exhibited significant passivation characteristics at higher concentrations of the alcohol in the acid solution. Open circuit corrosion potential measurements depict values within passivity potentials. Thermodynamic calculations show the molecules of the alcohol adhered onto the steel surface through physiochemical to chemisorption reaction processes with respect to Langmuir and Freundlich isotherms models. The compound exhibited cathodic type inhibition properties. Scanning electron microscopy confirmed the significant surface deterioration with visible corrosion pits, grooves and cracks on the control steel. This significantly contrasts the improved morphology of the inhibited steel. X-ray diffractometry confirmed both the absence of corrosion products and phases after exposure in the amino alcohol.
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