Effects of partial crystallinity and quenched-in defects on corrosion of a rapidly solidified Ti-Cu alloy

Abstract

Rapid solidification by planar flow casting has been found to have introduced deficiencies, viz. partial crystallinity, air pockets and compositional difference in the ribbons of rapidly solidified Ti 42·9Cu57·1 alloy. In order to investigate the effects of these deficiencies on the corrosion of rapidly solidified Ti 42·9Cu57·1 alloy ribbons, electrochemical behaviour of alloy ribbons has been investigated in the acidic chloride environments at room temperature by taking into consideration each side of the alloy ribbon separately. The alloy displayed passivity followed by pitting corrosion. In the as-solidified condition, air pockets appear to be the most detrimental defect from the viewpoint of corrosion resistance of the alloy ribbons.