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                           Study on Corrosion Behaviour of Zinc Coating on Commercially Available Galvanized Steels
                                                               Lwin Mar Myat#1, Shwe Wut Hmon Aye*2, Naing Naing Aung#3
#Department of Metallurgical Engineering and Materials Science, West Yangon Technological University, Hlaing Thar Yar , Yangon, Myanmar
                                                                                                   [email protected]
ABSTRACT
The corrosion behaviour of zinc coating on commercially available local and imported galvanized steels was studied in two different aqueous environments, 3.5% NaCl solution and rain water. Corrosion behaviour was analysed by immersion corrosion and salt spray testing. The characteristics of the corroded samples were investigated by Scanning Electron Microscopy (SEM) analysis. As longer exposure time the decreasing corrosion rate of both galvanized steels could be due to the physical barriers effect of the corrosion products at corroded sites. The results from SEM analysis indicated that local galvanized steel sample shows low corrosion resistance compared with imported galvanized steel sample in these two environments as a consequence of its weak protective coating layer.
Keywords - Exposure time, Galvanized steel, Immersion corrosion testing, 3.5% NaCl solution, Rain water, Salt spray testing.