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| Corrosion Inhibitor of Salicylic Aldehyde Pyridine Hydrazone for Mild Steel in Seawater |
| LIU Zheng, LIU Jie, LIU Jin, LIU Baoyu |
| College of Chemical and Biological Engineering, Guilin University of Technology, Guilin 541004, China |
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Abstract Three kinds of salicylic aldehyde pyridine formyl hydrazone Schiff bases compounds were synthesized. Their inhibition and adsorption behavior on low carbon steel in seawater were investigated by weight loss method, electrochemical methods, scanning electron microscopy and molecular dynamics simulations,respectively. Experiment results indicated that three kinds of salicylic aldehyde pyridine formyl hydrazone Schiff bases behaved as the mixed type inhibitors, and the inhibitors were excellent inhibitors for low carbon steel in seawater. Their capacity of inhibition were: L3> L2> L1.The weight loss method showed that the inhibition efficiency of L3 reaches 87.8% with the inhibitor concentration of 2.8 × 10-4 mol / L. The adsorption of the three inhibitors on the surface of carbon steel were found to follow the Langmuir adsorption isotherm ,which is a spontaneous exothermic process and the adsorption mechanism was chemisorption. Scanning electron microscopy and molecular dynamics simulations also proved that three kinds of Schiff bases, in particular, the L3 can effectively inhibit the seawater corrosion of low carbon steel.
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