Electrodeposition of Zn-Al-GO Nano Composite Coatings on Stainless Steel from Chloride Bath and Its Surface Morphological and Corrosion Protection Studies

Achary G, Kiran K, Shivakumar

Abstract

Thin films of Zn-Al-GO nanocomposites were prepared by electrodeposition in chloride bath solution with different concentration of dispersed graphite oxide (GO) colloid and Aluminum silicate. The various bath parameters were optimized to get the required morphology of the deposit and their effect on the morphology were studied. The micro morphologies of film were captured by scanning electron microscopy and EDAX, to get information about metal lattice parameters, texture and phase composition of the coatings which dramatically changed from to nanocrystal sheets owing to the addition of GO. The corrosion resistance properties of Zn-Al-GO composite coatings in HCl solution were investigated by the electrochemical methods. Using Stern method the corrosion potential - Ecorr, corrosion current density - icorr, and polarization resistance - Rp. have been determined as a measure of corrosion resistance. The nanocomposite coatings obtained from optimized bath parameters, showed better corrosion protective ability and surface properties.