Data on Evaluation of the Corrosion Inhibition Effect of L-alpha-aminoisocaproate on High Carbon Steel Corrosion in Dilute Acid Media

Abstract

Corrosion inhibition performance of l-alpha-aminoisocaproate on high carbon steel in 1 M HCl solution has been studied by weight loss measurement, open circuit potential measurement, optical microscopy and ATF-FTIR spectral analysis. The results showed the inhibition performance of l-alpha-aminoisocaproate is time dependent attaining an optimal value of 85.88 % at 5.63 % l-alpha-aminoisocaproate concentration (highest concentration) after 288 h of exposure. The corrosion potential plots of the high carbon steel at 0.91 % (lowest concentration) and 5.63 % l-alpha-aminoisocaproate concentration were more electropositive than the plots at 0% l-alpha-aminoisocaproate concentration due to the effective inhibition performance of l-alpha-aminoisocaproate in counteracting the oxidation of the carbon steel in the presence of chloride anions. Identified functional groups of alcohols, phenols, primary and secondary amines and amides, carboxylic acids, alkynes, aromatics, alkenes and alkanes consisting of O–H stretch, free hydroxyl, H–bonded, N–H stretch, –C(triple bond)C–H: C–H stretch, C–H stretch and =C–H stretch bonds where responsible for the corrosion inhibition. The optical morphology of the carbon steel after 7200 s of exposure in the acid solution without l-alpha-aminoisocaproate was severely corroded in contrast to the morphology of the steel in the presence of l-alpha-aminoisocaproate which underwent minor deterioration due to the time dependent action of the inhibitor.

Keywords

• corrosion
• inhibition
• adsorption
• steel