N-methyl-2-(2-nitrobenzylidene) hydrazine carbothioamide—A new corrosion inhibitor for mild steel in 1 mol·L-1 hydrochloric acid

doi:10.1016/j.cjche.2015.08.004

Abstract

Abstract: The corrosion inhibition of mild steel in 1 mol·L^-1 hydrochloric acid by N-methyl-2-(2-nitrobenzylidene) hydrazine carbothioamide (MNBHC)was studied usingweight loss and electrochemical studies. Results obtained indicate that the inhibitor is effective in hydrochloric acid medium and the efficiency decreases with increase in temperature. Added halide additives improve the efficiency of the inhibitor. The AC impedance studies reveal that the process of inhibition is through charge transfer. Polarization studies indicate the mixed nature of the inhibitor. Fromthe thermodynamic, spectral and surface analyses the nature of adsorption has been found out. The adsorption of the inhibitor on mild steel follows the Langmuir isotherm.

Key words: Mild steel, EIS, Mass loss, SEM, Acid corrosion

摘要： The corrosion inhibition of mild steel in 1 mol·L^-1 hydrochloric acid by N-methyl-2-(2-nitrobenzylidene) hydrazine carbothioamide (MNBHC)was studied usingweight loss and electrochemical studies. Results obtained indicate that the inhibitor is effective in hydrochloric acid medium and the efficiency decreases with increase in temperature. Added halide additives improve the efficiency of the inhibitor. The AC impedance studies reveal that the process of inhibition is through charge transfer. Polarization studies indicate the mixed nature of the inhibitor. Fromthe thermodynamic, spectral and surface analyses the nature of adsorption has been found out. The adsorption of the inhibitor on mild steel follows the Langmuir isotherm.

关键词: Mild steel, EIS, Mass loss, SEM, Acid corrosion

K. Krishnaveni, K. Sampath, J. Ravichandran, C. Jayabalakrishnan. N-methyl-2-(2-nitrobenzylidene) hydrazine carbothioamide—A new corrosion inhibitor for mild steel in 1 mol·L^-1 hydrochloric acid[J]. Chin.J.Chem.Eng., 2015, 23(11): 1916-1922.

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N-methyl-2-(2-nitrobenzylidene) hydrazine carbothioamide—A new corrosion inhibitor for mild steel in 1 mol·L^-1 hydrochloric acid

N-methyl-2-(2-nitrobenzylidene) hydrazine carbothioamide—A new corrosion inhibitor for mild steel in 1 mol·L^-1 hydrochloric acid

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