Effect of heat treatment on the corrosion performance of electrodeposited zinc alloy coatings

Abstract

The corrosion performance of zinc deposits when alloyed with d‐metals like nickel and cobalt was evaluated with special reference to heat treatment effects by conventional electrochemical methods such as potential‐time measurement and EIS. Immersion tests were also performed to substantiate the above results. The sacrificial ability of heat treated alloy deposits was examined in the context of protecting steel structures by galvanic coupling. The corrosion performance of the alloy deposits, obtained from the newly developed citrate‐based sulphate bath, was investigated in the neutral medium for instance, 3.5 per cent NaCl solution. XRD technique was employed to ascertain the desired phase formation of the alloy structure and the elemental analysis was performed by means of EDAX analyser in order to substantiate the XRD findings. Light microscopic examination was carried out on the deposits with and without heat treatment in order to study the surface character of these deposits. The microstructure of the alloy deposits was also examined by SEM.

Citation

Siluvai Michael, M. and Radhakrishna, S. (1998), "Effect of heat treatment on the corrosion performance of electrodeposited zinc alloy coatings", Anti-Corrosion Methods and Materials, Vol. 45 No. 2, pp. 113-119. https://doi.org/10.1108/00035599810693435