Experiments Design for Hardness Optimization of the Ni-Cr Alloy Electrodeposited by Pulse Plating
来源期刊：Acta Metallurgica Sinica2013年第5期
论文作者：I.Imanieh E.Yousefi A.Dolati M.R.Mohammadi
文章页码：558 - 564
摘 要：The hardness of the Ni-Cr alloy which is electrodeposited in chloride solution,is optimized by design of experiment method（central composite design）.Various parameters were evaluated in order to find significant factors in this process.Frequency,duty cycle,current density and temperature were selected as efective factors.Analyses of variance（ANOVA）were performed on the results of the designed experiments.The best model which can predict the hardness of the Ni-Cr alloy electrodeposits was found whereas the frequency and quadratic behaviour of the current density were the most significant model terms.Serious interaction of the current density with frequency and duty cycle also were found in this model.Finally the optimum conditions of the factors for obtaining the maximum hardness of the Ni-Cr alloy were found.Ni-Cr alloy with hardness828 HV（electrodeposited with frequency 63 Hz,current density 1800 A/m2,duty cycle 75%and temperature31℃ bath）were assessed as the optimum deposit.The deposit under the optimum condition was investigated by scanning electron microscopy（SEM）,EDX analysis,polarization method and microhardness.
I.Imanieh，E.Yousefi，A.Dolati，M.R.Mohammadi
Department of Materials Science and Engineering, Sharif University of Technology
摘 要：The hardness of the Ni-Cr alloy which is electrodeposited in chloride solution,is optimized by design of experiment method（central composite design）.Various parameters were evaluated in order to find significant factors in this process.Frequency,duty cycle,current density and temperature were selected as efective factors.Analyses of variance（ANOVA）were performed on the results of the designed experiments.The best model which can predict the hardness of the Ni-Cr alloy electrodeposits was found whereas the frequency and quadratic behaviour of the current density were the most significant model terms.Serious interaction of the current density with frequency and duty cycle also were found in this model.Finally the optimum conditions of the factors for obtaining the maximum hardness of the Ni-Cr alloy were found.Ni-Cr alloy with hardness828 HV（electrodeposited with frequency 63 Hz,current density 1800 A/m2,duty cycle 75%and temperature31℃ bath）were assessed as the optimum deposit.The deposit under the optimum condition was investigated by scanning electron microscopy（SEM）,EDX analysis,polarization method and microhardness.
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