Effect of surface nanostructuring on corrosion behavior of Ti–6Al–4V alloy

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2016.09.031· OSTI ID:22689644

Kumar, Sanjeev; Singh, Vakil

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. - Highlights: •Nanostructure was induced by USSP on alloy Ti–6Al–4V of about 28 nm. •Grain refinement was confirmed by XRD and TEM. •USSP is an effective technique for the improvement in corrosion resistance. •Nanostructured surface promotes formation of protective surface layer of TiO{sub 2}.

• OSTI ID: 22689644
• Journal Information: Materials Characterization, Vol. 121; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CORROSION RESISTANCE
ELECTROCHEMICAL CORROSION
GRAIN REFINEMENT
LAYERS
MORPHOLOGY
NANOSTRUCTURES
POLARIZATION
ROUGHNESS
SCANNING ELECTRON MICROSCOPY
SHOT PEENING
SURFACES
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
TUNGSTEN BASE ALLOYS
ULTRASONIC WAVES
VANADIUM ALLOYS
X-RAY DIFFRACTION