Journal
SURFACE ENGINEERING
Volume 36, Issue 4, Pages 429-437Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670844.2019.1680037
Keywords
Electroplating; XRD; Faradays efficiency; sulphamic acid; corrosion
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Funding
- N.M.A.M. Institute of Technology, Nitte
- Nitte Education Trust, Mangalore
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Acidic sulphate baths having ZnSO4 7H(2)O, NiSO4 7H(2)O, CoSO4 7H(2)O and sulphamic acid (SA) were optimized for the deposition of smooth Zn-Ni, Zn-Co and Zn-Ni-Co coatings on mild steel substrate. Bath compositions and deposition conditions were optimized by Hull cell method for maximum efficiency against depositions in corrosion. Faradic efficacy exceeded 90% as the current density increased; increased wt-% of nobler metal content (Ni and Co) in the deposit. Potentiodynamic polarization and electrochemical impedance spectroscopy indicates that the Zn-Ni-Co coating; corrosion resistance was 28 times higher than the Zn-Ni and 21 times higher than the Zn-Co coating. The good corrosion resistance of the Zn-Ni-Co coating was ascribed to its phase structure and the surface morphology. New cheap sulphate baths have been suggested for bright and uniform coating of Zn-Ni, Zn-Co and Zn-Ni-Co and result have been discussed.
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