Premium
Kinetic model of induced codeposition of Ni‐Mo alloys
Author(s) -
Yue Zeng,
Muig Ma,
XiaoMing Xiao,
ZeLin Li,
ShiXun Lian,
SbaoMin Zhou
Publication year - 2000
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20000180106
Subject(s) - chemistry , molybdenum , nickel , kinetic energy , molybdate , electrochemistry , ammonium molybdate , inorganic chemistry , saturated calomel electrode , metal , electrode , analytical chemistry (journal) , reference electrode , organic chemistry , raw material , physics , quantum mechanics
The kinetic model of induced codeposition of nickel‐molybdenum alloys from ammonium citrate solution was studied on rotating disk electrodes to predict the behavior of the electrode‐position. The molybdate (MoO 4 2− ) could be firstly electro‐chemically reduced to MoO 2 , and subsequently undergoes a chemical reduction with atomic hydrogen previously adsorbed on the inducing metal nickel to form molybdenum in alloys. The kinetic equations were derived, and the kinetic parameters were obtained from a comparison of experimental results and the kinetic equations. The electrochemical rate constants for discharge of nickel, molybdenum and water could been expressed as k 1 ,( E ) = 1.23 × 10 −9 C N exp( ‐ 0.198 FE/RT ) mol/(dm 2 · s), k 2 ( E ) = 3.28 × 10 −10 C Mo exp ( ‐ 0.208 FE/ RT ) mol/(dm 2 · s) and k 3 ( E ) = 1.27 × 10 −6 exp ( ‐0.062 FE/ RT ) mol/(dm 2 · s), where C N and C Mo , are the concentrations of the nickel ion and molybdate, respectively, and E is the applied potential vs. saturated calomel electrode (SCE). The codeposition process could be well simulated by this model.