Effect of surface nanostructuring on corrosion behavior of Ti
By Kumar, Sanjeev; Chattopadhyay, K.; Singh, Vakil
Published in Materials Characterization
NULL
2016
Abstract
Abstract Surface nanostructure was induced in Ti-6Al-4V alloy by ultrasonic shot peening (USSP) for different durations, from 15 s to 30 min, and the modified surface was characterized by optical, scanning, atomic force and transmission electron microscopy. Nano size grains were observed to form on surface of the {USSPed} samples and surface roughness was increased with duration of USSP. Polarization study was carried out in Ringer's solution to examine the effect of surface nanostructuring on corrosion resistance of this alloy. Electrochemical corrosion was carried out for all the {USSPed} specimens as well as the non-USSPed sample in Ringer's solution. Surface morphology of the corroded samples was examined by SEM. In general, corrosion resistance was improved by {USSP} up to the duration of 15 min and there was maximum improvement in the specimen {USSPed} for 1 min. However, corrosion resistance was drastically reduced due to {USSP} for long duration of 30 min.
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