磷酸三乙酯与稀土铈(Ⅳ)离子在盐酸溶液中对Cu的缓蚀协同效应

Synergistic Effect of Triethyl Phosphate and Cerium(Ⅳ) Ion on Corrosion Inhibition for Copper in Hydrochloric Acid Solution

采用电化学阻抗和动电位极化曲线研究了磷酸三乙酯(TEP)对Cu在0.5 mol/L盐酸溶液中的缓蚀作用,考察了TEP与稀土Ce4+对Cu在0.5 mol/L盐酸溶液中的协同作用。结果表明,在TEP浓度不变的情况下,随着Ce4+浓度的增加,缓蚀率先增后减,当Ce4+浓度为1.0 mmol/L时,缓蚀效果最好。在Ce4+浓度不变的情况下,随着TEP浓度的增加,缓蚀率逐渐增大。当复配缓蚀剂浓度为1 mmol/LCe4++58.7 mmol/L TEP时,其缓蚀率达到最大,为80.6%。

The inhibition effect of triethyl phosphate(TEP) and the synergistic effect of TEP and rare earth Ce4 +on the corrosion of copper in 0.5 mol/L hydrochloric acid solution were studied by electrochemical impedance spectra and potentiodynamic polarization curve. The result reveals that the inhibition efficiency of the mixed inhibitor increases with the increase of the concentration of Ce4 +until the critical concentration is reached when TEP concentration remains unchanged. When Ce4 +concentration remains unchanged, the inhibition efficiency increased with the increase of the concentration of TEP, reaching 80.6% at 1 mmol/L Ce4+and 58.7 mmol/L TEP.