Kinetic model of induced codeposition of Ni-Mo alloys
- 化学化工－已发表论文 
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 (MoO42-) could be firstly electrochemically reduced to MoO2, 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 x 10(-9) C(Ni)exp( - 0.198FE/RT) mol/(dm(2).s), k(2)(E) = 3.28 x 10(-10) C(Mo)exp(- 0.208FE/RT) mol/(dm(2).s) and k(3)(E) = 1.27 x 10(-6)exp(- 0.062FE/RT) mol/(dm(2).s), where C-Ni 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.