Corrosion inhibition effect of non-toxic �-aminoacid compound on high carbon steel in low molarconcentration of hydrochloric acid
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Electrochemical studies of the corrosion inhibition effect of biodegradable 2-amino-4-methylpentanoic acid (LCN) on high carbon steel in 1 M HCl acid was evaluated withpotentiodynamic polarization technique, weight loss analysis and optical microscopy.Results show the compound to be highly effective with optimal inhibition efficienciesof 87.46% and 85.88% from the electrochemical test with dominant cathodic inhibitionbehaviour between 0% and 1.88% inhibitor concentration and anodic inhibition behaviourat 2.81% and 5.63% inhibitor concentration due to changes in the effect of lateral repulsionbetween inhibitor molecules. Thermodynamic calculations showed chemisorption molec-ular interaction and adsorption onto HCS surface according to Langmuir, Freundlich andFrumkin isotherm models with correlation coefficients of 0.9991, 0.8727 and 0.9782. Sta-tistical analysis showed inhibitor concentration is only relevant variable responsible forinhibition efficiency. Calculated results from predicted corrosion rate values varied at anaverage value of 53% from experimental results. Optical microscopy images of LCN inhibitedand uninhibited HCS samples significantly contrast each.
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T Technology (General), TJ Mechanical engineering and machinery