PROGRESSIVE CORROSION STUDY OF METALS LIKE MILD STEEL, ZINC AND ALUMINIUM IN RURAL ATMOSPHERE

摘要

Corrosion rate (Progressive) of mild-steel (MS), zinc and aluminium has been determined under outdoor conditions of exposure at Mota-Vaghchhipa (South Gujarat) representing rural atmosphere. MS, zinc and aluminium plates exposed during November 2005 indicates corrosion rate of 31, 18 and 1 mg/sq.dm after one month exposure period and 3931, 1088 and 32 mg/sq.dm after twelve months (one year) exposure period. Mild steel panels exposed vertically suffer less corrosion than those exposed at an angle of 45°. The resistivity towards the atmosphere was n the increasing order: mild steel < zinc < aluminium. Corrosion rate of these three metals was found more in rainy seasons than the rate of winter and summer season.