有机缓蚀剂和Ⅰ^-的联合吸附与阳极脱附

THE JOINT ADSORPTION/DESORPTION OF ORGANIC INHIBITOR AND I^- ANION ON IRON ELECTRODE IN SURFURIC ACID SOLUTION

研究了硫酸溶液中三种不同的含氮有机缓蚀剂与Ⅰ－在铁电极上的联合吸附和阳极脱附行为．结果表明，联合吸附能明显提高吸附层的稳定性；阳极脱附电位与吸附粒子浓度的关系可为判断联合吸附模型和粒子竟争吸附能力提供有用信息；吸附展稳定性越高，其阳极脱附速度越快．

The adsorption and desorption behavior of three kinds of organic corrosion inhibitors {β-phenylaminopropiophenone (PAP), hexadecylpridinum bromide (HDPB) 3 and cetyltrirnethyl ammonium bromide (CTAB)}and/or I- on iron electrode in 0. 5mol. L-1 H2SO4solution was investigated by polarization curve measure ments. The results showed that the adsorption stability of the organic inhibitors and /or I- was closely related to their anodic desorption behavior. The anodic desorption potential (Edes) of the joint adsorption layer was more positive than that of the individual species, which suggested that the joint adsorption layer was more stable. The dependence of Edes on the concentration of each constituent not only could provide an evidence for the joint adsorption mode but also could decide the competitive ability of the different species. Furthermore, the desorption rate and the desorption potential region of various adsorption layers were discussed on the basis of the differential polarization curves.