3.5%NaCl溶液中FFFD-27SH型防腐剂对碳钢的缓蚀性能研究

Inhibition Performance of FFFD-27SH Inhibitor for Carbon Steel in 3.5% NaCl Solution

采用动电位极化曲线和电化学阻抗法(EIS),研究了3.5%NaCl(质量分数)溶液中FFFD-27SH型防腐剂对碳钢腐蚀的抑制行为。结果表明,FFFD-27SH为阳极型防腐剂,该防腐剂的加入可有效降低碳钢的腐蚀电流密度,增大腐蚀电位;显著增大碳钢电极的电荷传递电阻和膜电阻,明显降低双电层电容;缓蚀效率随添加浓度增大而增大,当添加浓度大于3%时,缓蚀效率变化不大。

The inhibitive action of FFFD-27SH inhibitor toward carbon steel corrosion in 3.5%Na- C1 solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy （EIS）. The results indicate that the addition of FFFD-27SH, which acts as an anodic type inhibitor, can effectively decrease the corrosion current densities of the carbon steel and in- crease the corrosion potential. EIS measurement results indicate that both of the charge transfer re- sistance and impedance increase greatly with the addition of FFFD-27SH and the double electric layer capacitance decreases significantly. The inhibition efficiency increases with the increase in in- hibitor concentration, but changes little when its concentration is over 3%.