Kinetic model of induced codeposition of Ni-Mo alloys |
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Authors: | ZENG Yue MA Ming XIAO Xiao-MingLI Ze-Lin LIAN Shi-Xun ZHOU Shao-Min |
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Affiliation: | ZENG,Yue MA,Ming XIAO,Xiao-MingLI,Ze-Lin LIAN,Shi-Xun ZHOU,Shao-Min Department of Chemistry,Hunan Normal University,Changsha,Hunan 410006,China Department of Chemistry,Xiamen University,Xiamen,Fujian 361005,China |
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Abstract: | 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 electro‐chemically 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 k1,(E) = 1.23 × 10?9 CNexp( ‐ 0.198 FE/RT) mol/(dm2 · s), k2 (E) = 3.28 × 10?10 CMoexp ( ‐ 0.208FE/ RT) mol/(dm2 · s) and k3(E) = 1.27 × 10?6 exp ( ‐0.062FE/ RT) mol/(dm2 · s), where CN and CMo, 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. |
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Keywords: | Kinetic model induced codeposition Ni-Mo alloy |
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