应用电化学动电位扫描方法研究了在含低浓度H2S的硫酸溶液中Cl-对铁阳极溶解的影响。采用量子化学计算方法（CNDO/2），得到了Cl-与HS-在电极表面吸咐的稳定形态，优化计算了阳极电位下Cl-与HS-竞争吸咐的总能量、结合能和Fe原子净电荷分布。结果表明，一定浓度的Cl-可在电极表面阳极区稳定吸附，从而降低Hs-的界面浓度，抑制铁的阳极反应；Cl-达到饱合吸附后，铁溶解反应途径发生改变，此时Fe(Cl-)ads 作为吸附中间物促进阳极反应；Cl作用转化的临界浓度为1mol/L.
The effect of Cl- ion on the anodic dissolution of iron in H2SO4 solutions containing low H2S levle has been stdied by electrochemical polarization curve measurements.Meanwhile,the stable adsorption patterns of Cl- and HS- ions on iron surface were determined with CNDO/2 method.Furthermore,the total energy and binding energy of the competitive adsorption between Cl- and HS- ions under the anodic potential as well as the net charge distribution of iron atoms were calculated.The results showed that certain concentration of Cl- ion could adsorb steadily in the anodic regions of electrode surface,reduce the interfacial concentration of HS- ion,and thereby inhibit the anodic reaction of iron.However,when Cl- ions reached saturated adsorption,the reaction courses changed into iron dissoltion promoted by Fe(Cl-)ads.The critical concentration of Cl- ion for the action transition was 1 mol/L
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