【作者】 周鸿勋； 王海江；

【Author】 Zhou Hougxun Wang Haijiang In our previous paper.We have demonstrated that in the Ammonia-NicotinicAcid bright Silver electroplating bath Ag(I)is mainly Ag(NH_(?))_(?)~+ in bulk Solution andAg(C_(?)H_(?)NO_a)_a on the surface of the electrode when it discharges.The differenceshows that a preceding chemical reaction must exist.This can be homogeneous or(?)heterogeneous.Experments of Chronopotential curve measurement and measurement ofpolarization curve on rotating dise electrode negated the existance of homogeneouspreceding chemical reaction.Hence,a conclusion is achieved that a heterogeneouspreceding chemical reaction must exist.Analyses to the polarization carve on RDEfurther demonstrated the above conclusion and the effects of the existance of theheterogeneous preceding chemical reaction on whole electrode process have been dis-cussed

【机构】 河南师范大学化学系； 河南师范大学化学系；