Electrodeposited anodic oxide coatings were produced on Ti-6Al-4V from phosphoric acid electrolyte. Different coatings were produced by varying the time periods. Structure of the coatings was analysed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The coatings were exposed to simulated body fluid for a period of 1 month and the weight loss is used to calculate the corrosion rate. Electrochemical polarization and ac impedance studies were performed on the coatings in simulated body fluid and it was found that coatings produced from shorter times showed very good resistance to the attack by this medium. © 2006 Elsevier Ltd. All rights reserved.

Suresh Krishnamoorthy Seshadri

Anodic oxidation

corrosion

Electrodeposition

Phosphoric acid

titanium

Transmission electron microscopy

X ray diffraction analysis

AC IMPEDANCE

Corrosion rate

OXIDE COATINGS

Titanium alloys

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Corrosion Science

In the work presented in this manuscript, a self-organized TiO2&nbsp;nanotube array film was produced by electrochemical anodization of a Ti&ndash;V alloy in an electrolyte containing NH4F/H3PO4&nbsp;and then annealed at different temperatures under different atmospheres. The effect of annealing temperature in different atmospheres on the morphology of the film was analyzed, and the tribo-mechanical property and corrosion behavior of TiO2&nbsp;were investigated. The morphological features and phase compositions were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively. The results indicated that the TiO2&nbsp;characteristic peaks did not appear after anodization because of the intrinsic amorphous feature. However, highly crystalline TiO2&nbsp;(anatase and rutile) was produced after annealing from 200 to 600 &deg;C. In addition, there was an improvement in the wear resistance of the Ti&ndash;V alloy due to the high hardness and low coefficient of friction of the TiO2&nbsp;nanotubes&rsquo; coating. Moreover, the corrosion behaviors of TiO2&nbsp;coated and uncoated substrates were evaluated in the synthetic medium, and it was confirmed that the corrosion resistance of the TiO2-coated Ti&ndash;V alloy, annealed at 200 &deg;C in the atmosphere, was significantly higher when compared to the uncoated sample.

Fulltext

Coatings

Tribo-Mechanical Properties and Corrosion Behavior Investigation of Anodized Ti–V Alloy

In the work presented in this manuscript, a self-organized TiO2 nanotube array film was produced by electrochemical anodization of a Ti-V alloy in an electrolyte containing NH4F/H3PO4 and then annealed at different temperatures under different atmospheres. The effect of annealing temperature in different atmospheres on the morphology of the film was analyzed, and the tribo-mechanical property and corrosion behavior of TiO2 were investigated. The morphological features and phase compositions were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively. The results indicated that the TiO2 characteristic peaks did not appear after anodization because of the intrinsic amorphous feature. However, highly crystalline TiO2 (anatase and rutile) was produced after annealing from 200 to 600 °C. In addition, there was an improvement in the wear resistance of the Ti-V alloy due to the high hardness and low coefficient of friction of the TiO2 nanotubes' coating. Moreover, the corrosion behaviors of TiO2 coated and uncoated substrates were evaluated in the synthetic medium, and it was confirmed that the corrosion resistance of the TiO2-coated Ti-V alloy, annealed at 200 °C in the atmosphere, was significantly higher when compared to the uncoated sample. © 2019 by the authors.

Tribo-mechanical properties and corrosion behavior investigation of anodized Ti-V alloy

Gel-like layer development during formation of thin anodic films on titanium in phosphoric acid solutions

Biomaterials

Accumulation of aluminium in lamellar bone after implantation of titanium plates, Ti–6Al–4V screws, hydroxyapatite granules

Journal	Corrosion Science
ISSN	0010938X
Open Access	No