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Magneto-electrodeposition of Sn–Ni alloy Coating for Better Corrosion Protection

Sandhya Shetty, Vaishaka R. Rao, Ampar Chitharanjan Hegde

Abstract


The present paper reports the development of excellent corrosion resistant Sn–Ni alloy coatings from a new pyrophosphate bath by magneto-electrodeposition (MED) approach. First part reports optimization of conditions for deposition of Sn–Ni coatings on mild steel by conventional electrodeposition (ED) method and their characterization. The second part demonstrates how the corrosion resistance of Sn–Ni alloy coatings can be improved drastically by MED method, using same bath. Significant decrease of corrosion rate exhibited by MED coatings (under parallel and perpendicular magnetic field, B) was attributed to increase of Sn content in the deposit due to increase of its limiting current density (iL). Drastic decrease of corrosion rates was due to basic difference in the process of electro-crystallization and phases found in MED coatings, confirmed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) study. Low corrosion rates were attributed to unique phase structures formed, namely Sn (220), (411), (501) and Ni (200) which do not correspond to any distinct phases in ED Sn–Ni coatings. Changed crystallographic orientation and surface morphology of MED coatings, responsible for less corrosion rate were explained in the light of magneto-hydrodynamic (MHD) effect, and results are discussed.

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