Metallic implants such as hip and knee often fail due to the combined action of wear and corrosion. Nanocrystalline diamond (NCD) coatings on metallic implants can be a potential candidate to overcome this issue. In this work, we investigated the tribocorrosion and electrochemical behaviour of Nanocrystalline Diamond (NCD) Coatings deposited on Cp-Ti, Ti-6Al-4V and Ti-13Nb-13Zr using hot filament chemical vapour deposition (HFCVD) technique. The results demonstrate that the factors such as intercrystallite pores, TiC interlayer, and electrical conductivity influenced the electrochemical behaviour of all the NCD coatings. Under tribocorrosion, an unexplainable shift in the open circuit potential (OCP) was noticed at the initiation of sliding. Further, a continuous decrease in OCP was also observed as the sliding progress. © 2016 Elsevier Ltd

Mamidanna Sri Ramachandra Rao

Gopal V

Chandran M

Rao M.S.R

Mischler S

Cao S

Manivasagam G.

Aluminum coatings

Chemical vapor deposition

Coatings

corrosion

Diamonds

Electrochemical corrosion

Nanocrystalline alloys

Nanocrystals

Niobium

titanium

Chemical vapour deposition

Electrical conductivity

ELECTROCHEMICAL BEHAVIOUR

NANOCRYSTALLINE DIAMOND COATINGS

NANOCRYSTALLINE DIAMONDS

Open circuit potential

ORTHOPAEDIC APPLICATIONS

Tribo-corrosion

Titanium alloys

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Tribology International

Colloids and Surfaces B: Biointerfaces

Axial Suspension Plasma Spraying: An ultimate technique to tailor Ti6Al4V surface with HAp for orthopaedic applications

Nanobiomaterials

Use of nanostructured materials in implants

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

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

Biomedical implants in the knee and hip are frequent failures because of corrosion and stress on the joints. To solve this important problem, metal implants can be coated with diamond carbon, and this coating plays a critical role in providing an increased resistance to implants toward corrosion. In this study, we have employed diamond carbon coating over Ti-6Al-4V and Ti-13Nb-13Zr alloys using hot filament chemical vapor deposition method which is well-established coating process that significantly improves the resistance toward corrosion, wears and hardness. The diamond carbon-coated Ti-13Nb-13Zr alloy showed an increased microhardness in the range of 850 HV. Electrochemical impedance spectroscopy and polarization studies in SBF solution (simulated body fluid solution) were carried out to understand the in vitro behavior of uncoated as well as coated titanium alloys. The experimental results showed that the corrosion resistance of Ti-13Nb-13Zr alloy is relatively higher when compared with diamond carbon-coated Ti-6Al-4V alloys due to the presence of β phase in the Ti-13Nb-13Zr alloy. Electrochemical impedance results showed that the diamond carbon-coated alloys behave as an ideal capacitor in the body fluid solution. Moreover, the stability in mechanical properties during the corrosion process was maintained for diamond carbon-coated titanium alloys. © 2018, ASM International.

Fulltext

Journal of Materials Engineering and Performance

Electrochemical Behavior of Biomedical Titanium Alloys Coated with Diamond Carbon in Hanks’ Solution

Tribocorrosion and electrochemical behaviour of nanocrystalline diamond coated Ti based alloys for orthopaedic application

Journal	Data powered by TypesetTribology International
Publisher	Data powered by TypesetElsevier Ltd
ISSN	0301679X
Open Access	No