AQUEOUS CORROSION BEHAVIOR OF DUCTILE IRON AND DUCTILE IRON-CONTAINING 1 WT. PCT. CHROMIUM

Ductile irons with graphite in spheroidal form enjoy the processing ch aracteristics of grey iron and mechanical properties of steel. This pa per describes the corrosion behaviour of ductile iron containing 1 wt. % chromium in sea water, dilute sulphuric acid and dilute sodium hydr oxide solutions and compares with that of unalloyed ductile iron. Stud y is made in as-cast, annealed and cold worked (upto 28% reduction in thickness) conditions at three different temperatures. Since the alloy ing addition brings changes in the proportion of phases, the corrosion behaviour of the two materials studied were different, though alloyin g addition is small, indicating corrosion behaviour to be structure se nsitive.