%0 Journal Article
%T STUDIES ON THE KINETICS OF Ni DISSOLUTION IN AQUEOUS AMMONIACAL SOLUTION<br>
%A Xia Guangxiang
%A Chen Jiayong Institute of Chemical Metallurgy
%A Academia Sinica
%A <br>
%J 金属学报
%D 1980
%I 
%X Studies have been carried out on the kinetics of Ni dissolution in aqueoussolution of NH_3 and (NH_4)_2CO_3 with O_2 present. It is shown that the NH_3 andNH_4~+ salt dissolution of Ni is an electrochemical reaction accompanied by surfaceoxidation of Ni by O_2. The reaction rate may be either in the NH_3 concentrationcontrol region or in the O_2 concentration control region depending on the ratio ofthe concentration of NH_3 and that of O_2. In the NH_3 controlling region, the surface of Ni will be passivated rathereasily with the formation of oxide film. The dissolution reaction will then beinterrupted. In the O_2 controlling region, the rate of reaction will be controlled bythe rate of O_2 transfer through the liquid film around the Ni surface. It can becorrelated with the equation of the rate of O_2 mass transfer.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=45819ADC9BA2B17C5D2C500F02FC561C&yid=E56875464B1C0EC1&vid=7801E6FC5AE9020C&iid=38B194292C032A66&sid=211C7E02AC474301&eid=DFEE4E8C33C95CEF&journal_id=0412-1961&journal_name=金属学报&referenced_num=0&reference_num=11