Corrosion rate (Progressive) of mild-steel (MS), zinc and aluminum have been determined under outdoor conditions of exposure at Tithal (South Gujarat) representing a marine environment. Mild steel (MS), zinc and aluminium plates exposed during November-2005 indicates corrosion rate of 122, 55 and 2.1 mg/sq.dm for one month exposure period and 3305, 1227 and 25.9 mg/sq.dm for twelve months exposure period. Mild steel panels exposed vertically suffer less corrosion than those exposed at an angle of 45°. The resistivity towards the environment was in the increasing order of mild steel < zinc < aluminium. Corrosion rate of these three metals was found more in rainy seasons than the rate of winter and summer season.
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