The fretting corrosion behaviour of thermally oxidized (at 650 °C for 48 h) commercially pure (CP) titanium in Ringer's solution was evaluated and reported for the first time in this paper. A cathodic shift in free corrosion potential (FCP) with the onset of fretting occurs very rapidly for untreated CP-Ti whereas it occurs over the entire 18,000 cycles for thermally oxidized (TO) CP-Ti and the extent of cathodic shift in FCP is relatively less for TO CP-Ti. The tribocorrosion performance of TO CP-Ti is better than that of untreated CP-Ti. © 2009 Elsevier Ltd. All rights reserved.

S. Ganesh Sundara Raman

Department of Metallurgical and Materials Engineering

Satendra Anand Kumar

Suresh Krishnamoorthy Seshadri

A. Titanium

B. Polarization

C. FRETTING CORROSION

CATHODIC SHIFTS

COMMERCIALLY PURE TITANIUMS

Corrosion potentials

RE-PASSIVATION

RINGER'S SOLUTION

THERMALLY OXIDIZED

Tribo-corrosion

Corrosive effects

Diffraction

Electrochemical corrosion

FRETTING CORROSION

oxidation

Passivation

Polarization

titanium

X ray diffraction

TITANIUM METALLOGRAPHY

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

Titanium (Ti) is a lustrous transition metal which possesses excellent corrosion resistance in several aggressive environments but is attacked by acidic fluoride media. In this work, the addition of fluoride ion to nitric acid on the corrosion behavior of Ti and air-oxidized Ti was studied. Air oxidation of Ti at 800 °C for 5 h resulted in the formation of an intact rutile TiO2 layer with a thickness of about 35 μm. The corrosion resistance was investigated from the polarization resistance (RP) values which were obtained from linear polarization and electrochemical impedance spectroscopy (EIS) measurements. A decrease in the RP value of Ti with the addition of fluoride ion in nitric acid was observed, and this indicated the formation of an unstable layer, which resulted in accelerated dissolution. The several order increase in the RP value of air-oxidized Ti in nitric acid containing fluoride ions pointed the improved resistance to corrosion. The diffusivity of species through the air-oxidized TiO2 layer was estimated from the electrochemical equivalent circuit (EEC) analysis of EIS data. Even though the diffusivity increased by several orders with the addition of fluoride ions, air-oxidized Ti provided better protection against nitric acid containing fluoride ions than Ti. The corrosion rates of Ti and air-oxidized Ti in boiling nitric acid containing fluoride ions were also estimated from weight loss experiments. Even in boiling fluorinated nitric acid, air-oxidized Ti provided better corrosion protection, with corrosion rates of about 1000 times less than that of Ti. © 2019, The Author(s).

Fulltext

Transactions of the Indian Institute of Metals

Studies on Corrosion of Titanium and Air-Oxidized Titanium in Fluorinated Nitric Acid

Fretting corrosion of boride coated commercially pure titanium (CpTi) is investigated in Ringer's solution using open circuit potential (OCP) method. Coating is synthesized at 850, 910 and 1050 °C for 1, 3 and 5 h. Upon fretting, borided specimens exhibited lower galvanic coupling than bare and correspondingly the wear loss. TiB2+TiB and/or TiB2 thickness plays a significant role in determining the fretting resistances. Passivation/repassivation is attributed by TiO2/B2O3 and TiO2 formations in borided and bare CpTi respectively. Study revealed that suppression of summation of synergistic and corrosion components improved the fretting performance of coated CpTi. Boriding of CpTi has enhanced the biocompatibility response. © 2018 Elsevier Ltd

Tribology International

Fretting corrosion response of boride coated titanium in Ringer's solution for bio-implant use: Elucidation of degradation mechanism

Fretting corrosion is a complex phenomena and a variety of factors such as load, contact area, frequency, number of fretting cycles, extent of damage of the fretted zone, trapping of debris between the contacting surfaces, corrosivity of the medium, etc., will determine the fretting-corrosion behaviour. The present paper aims to develop a fretting-corrosion map of commercially pure Ti (CP-Ti) based on its fretting-corrosion behaviour in Ringer's solution under various combinations of load, frequency and number of fretting cycles. Based on the fretting-corrosion behaviour and restoration ability, a fretting-corrosion map of CP-Ti in Ringer's solution is developed for the first time. The fretting-corrosion map of CP-Ti in Ringer's solution enables identification of various regimes depending on the nature of predominant phenomenon for a given set of conditions. Since fretting corrosion is the dominant phenomenon at lesser duration of fretting at 5 and 10 Hz for a load of 3 and 5 N, the safer use of CP-Ti, particularly for hip and knee implants, is a major concern. © 2010 Elsevier B.V. All rights reserved.

Wear

Fretting-corrosion mapping of CP-Ti in Ringer's solution

In situ impedance spectroscopy study of the electrochemical corrosion of Ti and Ti–6Al–4V in simulated body fluid at 25°C and 37°C

Improving the corrosion and tribocorrosion resistance of Ni–Co nanocrystalline coatings in NaOH solution

Depassivation–repassivation behavior of type-312L stainless steel in NaCl solution investigated by the micro-indentation

Tribocorrosion of 316L stainless steel and TA6V4 alloy in H2SO4 media

Tribology Letters

Tribocorrosion of Diamond-Like Carbon Deposited on Ti6Al4V

Fretting corrosion behaviour of thermally oxidized CP-Ti in Ringer's solution

Journal	Corrosion Science
ISSN	0010938X
Open Access	No