COMPARATIVE STUDY ON THE CORROSION RATE OF GRAY AND DUCTILE CAST IRON IN HCl SOLUTION
Publication Date : 01/02/2010
The corrosion characteristics of Ductile and Gray Cast Irons in varying concentrations of HCl acid were investigated using weight loss method of corrosion analysis. The cast irons were obtained from the foundry shop of the National Metallurgical Development Center, Jos. The cast iron were cut and machined into coupons, then suspended in solutions of the acid concentrations (0.2, 0.4, 0.6, 0.8. and 1.0M) for 8 days. From the result, it was observed that the rate of corrosion of both irons increased with increase in concentrations of the acid but decreased with the time of exposure. However, the gray iron had the lowest corrosion rates in all the acid concentrations and this is attributable to the graphite flake structure of Gray Cast Iron which are tightly bound together as compared to discrete nodules readily detachable in Ductile Iron.
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