EDA对铜在稀盐酸中的缓蚀效果及硫离子的影响

Effects of Sulfide Ions on the Inhibiting Efficiency of EDA as a Copper Corrosion Inhibitor in Dilute HCl Solution

应用极化曲线塔菲尔区外推法考察了以乙二胺(EDA)作酸性溶液铜缓蚀剂的缓蚀行为以及硫离子对其缓蚀效果的影响.结果表明,在含有EDA的酸性溶液中加入Na2S使铜的腐蚀电位正移,腐蚀速率降低,缓蚀效率提高.溶液中HS-的存在能对EDA的缓蚀作用产生协同效应,这主要是由于HS-在铜表面的强化学吸附,从而更有利于EDA在铜表面形成CuHSEDA吸附保护层,抑制铜的腐蚀.

The anticorrosion action of EDA on copper in dilute HC1 solution and the effect of sulfide ions on the inhibiting efficiency were studied by the Tafel plot method. The corrosion potential of Cu shifted to more positive value and the corrosion current density decreased after the addition of Na2S to the solution. The results indicated that sulphide ions could increase the inhibiting efficiency of EDA because of the synergistic inhibition effect between EDA and Na2S,resulting from the adsorption of HS^- on the surface of Cu,facilitated the adsorption of EDA to form a highly protective adsorbed layer which prevented Cu from corrosion. Key words： Copper, Corrosion inhibitor, EDA, Na2S