Studies on electrodeposition of corrosion resistant Ni–Fe–Mo alloy |
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Authors: | Renato A C Santana Shiva Prasad Elisangela S Moura Ana R N Campos Gecilio P Silva Pedro Lima-Neto |
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Affiliation: | (1) Department of Chemical Engeering, Universidade Federal de Campina Grande, Post Box 10108, Campina Grande, Paraiba, 58109-970, Brazil |
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Abstract: | A study to optimize the process parameters for electrodeposition of a Ni–Fe–Mo alloy is reported. A 22full factorial design was successfully employed for the experimental design analysis of the results. The optimum experimental
conditions for producing the corrosion resistant alloy were 120 mA/cm2 current density, 20 rpm cathode rotation, 9.0 pH at 30 °C. The alloy was deposited at 61% current efficiency, with an average
composition of 62 wt% Ni, 17wt% Fe, 21wt% Mo and traces of boron, and with E
corr −0.506 V, R
p
8.883 × 103 Ohm cm2 and I
corr 6.468 × 10−7 A/cm2. The deposit obtained under these conditions had an amorphous character, good adherence, high corrosion resistance and a
nodular morphology. Electrochemical corrosion tests verified that the electrodeposited Ni–Fe–Mo alloy had better corrosion
resistance than the Fe–Mo alloy. |
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Keywords: | |
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