Evaluation of corrosion resistance of electrodeposited nanocrystalline Ni-Fe alloy coatings

Nickel-iron alloys with a compositional range of 24-80 wt-% iron were electrodeposited on a copper substrate from a sulphate-based bath and using a stirring rate of 100 rev min −1 . The effect of applied current density and Ni 2+ /Fe 2+ metal ion ratio of plating bath on the properties of alloy coat...

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Bibliographic Details
Published inTransactions of the Institute of Metal Finishing Vol. 95; no. 5; pp. 269 - 275
Main Authors Farshbaf, P. A., Bostani, B., Yaghoobi, M., Ahmadi, N. P.
Format Journal Article
LanguageEnglish
Published Taylor & Francis 03.09.2017
Subjects
Corrosion
Electrodeposition
FeNi
Microhardness
Nanocrystalline structure
NiFe alloy
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Summary:Nickel-iron alloys with a compositional range of 24-80 wt-% iron were electrodeposited on a copper substrate from a sulphate-based bath and using a stirring rate of 100 rev min −1 . The effect of applied current density and Ni 2+ /Fe 2+ metal ion ratio of plating bath on the properties of alloy coatings was examined. Crystal structure and grain size of Ni-Fe alloy coatings were investigated using X-ray diffraction technique. Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy were used to analyse the surface morphology and chemical composition of coatings. Microhardness test was applied to evaluate the hardness of the coatings. Finally, the electrochemical behaviour of the Ni-Fe alloy coatings was studied by a polarisation test in 10 wt-% H 2 SO 4 solution. Results revealed that current density and plating bath composition had a strong effect on the characteristics of coatings. As the iron content of alloys produced increased, their corrosion resistance improved with the best corrosion resistivity being achieved at a metal ion ratio of 0.5 and applied current density of 2.5 A dm −2 .
ISSN:0020-2967
1745-9192
DOI:10.1080/00202967.2017.1338375