Corrosion behaviour of Ti DLC deposition on prenitrided 316L stainless steel and Ti–6Al–4V alloy

Abstract

316L and Ti-6Al-4V are widely used as biomaterials and materials of various mechanical components. In biomedical applications, they are used to manufacture coronary and pulmonary stents, hip prosthesis, screws and external fixations. However, Cr, Al and V are released from the alloys to the body environment and these ions mix into the blood stream. Release of even small amounts of these ions may cause local irritation of the tissues surrounding the implant. This situation may be prevented by applying suitable surface treatments to the biomaterials. The overall objective of the present paper is to examine the corrosion properties of duplex treated (nitrided and with a diamond-like carbon coating) 316L stainless steel and Ti-6Al-4V alloy. Diamond-like carbon films were deposited on nitrided samples using closed field unbalanced magnetron sputtering system. The corrosion behaviour of duplex treated samples was tested using the potentiodynamic method in ringer's solution at 37uC. The corrosion resistance of duplex treated samples was significantly improved in comparison with the uncoated and single treated samples. In addition, the corroded surfaces were investigated by SEM where small pits were observed on all samples.

Effect of voltage on microstructure and corrosion resistance of microarc oxidation coatings on CP-Ti

“…5,6 In recent years, many surface treatment technologies have been studied for use with titanium and its alloys, most notably anodising, 7 physical vapour deposition, 8 nitriding, 9 sprayed 10 and ion implantation surface treatment. 11 Recently, microarc oxidation (MAO) has been developed to provide coatings for Al, Ti and Mg components, 12–14 as these ceramic coatings have good wear resistance, high corrosion resistance and, especially, good adhesion between metal and coating in comparison with the conventional anodising treatment. The treatment of biomedical titanium and titanium alloys by MAO to improve their corrosion resistance and bioactivity has been widely investigated.…”

Hydrophobicity and corrosion resistance of steels coated with PFDS film

“…To date, numerous types of films such as Cr, Ni, Zn, Cu, Al 2 O 3 , TiO 2 and diamond-like carbon have been manufactured for coating applications via electrochemical reactions, plasma treatments and other processes. [1][2][3][4][5][6][7][8][9][10][11] Some films are of particular interest because they not only exhibit the shielding effect but also donate excess electrons to the metal by a cathodic or catalytic photoelectron reaction. 10,11 The contact behaviour of water with a metal surface is generally investigated by measuring the static contact angle (CA) of a water droplet (WD) on the metal.…”

Effect of plasma nitriding treatment on structural, tribological and electrochemical properties of commercially pure titanium

“…The cause of these fluctuations is thought to be the increase in the surface roughness due to the layer that formed on the surface of nitrided pure titanium. In addition, in some previous studies, 21,36 it was underlined that the abrasive effect by the nitride layer which formed on the surface especially after the plasma nitriding treatment at higher temperatures caused such fluctuations. However, no abrasive wear scar was observed in our study when looked at the wear scars (Figure 5).…”

“…It has been mentioned in the literature that wear resistance of the surface of nitrided titanium increases with the increasing treatment temperature and duration. 4,21 It has also been observed that the levels of surface hardness and wear resistance increase with longer treatment durations in the plasma nitriding treatments applied at the same treatment temperature. Yildiz and Alsaran 22 reported that they achieved the highest value of hardness by applying the plasma nitriding treatment to Ti-6Al-4V alloy at 750 °C for 1, 2 and 4 h and the strongest wear resistance at 750 °C for 4 h. In another study, the titanium alloy was plasma nitrided in a gas mixture of 25% argon and 75% nitrogen at 500 °C, 600 °C, 700 °C, 800 °C, and 900 °C for 4 h. It was reported that δ-TiN phase did not form on the surfaces nitrided at the temperatures under 700 °C.…”

“…Hence, several research works investigate them in simulated body fluid (SBF) and Ringer's solution. 4,[26][27][28] The corrosion resistance of titanium alloys in the SBF shows the recovery tendency after nitriding. It was reported that oxidation process of the nitrided titanium alloy leads to the deterioration of the protective properties of Ti-6Al-4V alloy.…”