Citation:
He Yi, Yang Ranran, Wang Yajie, Li Fei, Liu Song. Study on Synthesis and Property of the Methionine Derivative Corrosion Inhibitor[J]. Chemistry,
;2016, 79(3): 248-253.
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A novel methionine derivative corrosion inhibitor was synthesized by amidation of methionine. The performance of methionine and its derivative as corrosion inhibitors of N80 steel were investigated in the aggressive condition of 3(wt)% sodium chloride solution with potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and SEM. The mechanism of corrosion inhibitor on carbon steel surface in molecular structure level was explored, too. The results showed that the methionine and its derivative act as the anodic type inhibitor, and the corrosion rate was increased with the increase of inhibitor concentrations. The inhibition efficiency reached approximately 86.94% with methionine derivative dosage of 250mg/L in the aggressive condition of 3(wt)% NaCl solution for N80 carbon steel. At the same concentration, the inhibition efficiency of methionine derivative is better than that of methionine, which origins from the increase of the adsorption sites and hydrophobic long chain in molecular structure of methionine derivative.
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Keywords:
- Inhibitor,
- Electrochemical test,
- SEM,
- Adsorption
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