Citation:
LI Xiang-Hong, DENG Shu-Duan, FU Hui, MU Guan-Nan. Synergistic Inhibition Effect of Rare Earth Ce4+ and Vanillin on Corrosion of Cold Rolled Steel in H3PO4 Media[J]. Chinese Journal of Applied Chemistry,
;2010, 27(7): 836-841.
doi:
10.3724/SP.J.1095.2010.90692
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The synergistic inhibition effect of rare earth Ce4+ and vanillin (4-hydroxy-3-methoxy-benzaldehyde) on the corrosion of cold rolled steel(CRS) in 3.0 mol/L H3PO4 solution was studied by mass loss,potentiodynamic polarization and UV-Vis spectrophotometry(UV-Vis). The present study reveals that vanillin exhibits a moderate inhibitive effect on the corrosion of CRS. The inhibition efficiency(IE) increases with the concentration increase,and the maximum IE is 66%. The adsorption of vanillin on the CRS surface obeys Freundlich adsorption isotherm equation. Ce4+ shows a poor inhibition performance and the maximum IE is not more than 20%. However,incorporation of rare earth Ce4+ with vanillin significantly improves the inhibition performance and produces a synergistic inhibition effect. The maximum IE is as high as 90%. Ce4+ and vanillin form a new complex,which acts as a mixed-type inhibitor.
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