Surface characteristics of titanium-silver alloys in artificial saliva

Abstract

Titanium and its alloys are widely used in biomedical and dental fields because of their excellent corrosion resistance and biocompatibility. It is well known that titanium is protected from corrosion because of the stability of the passive film that controls and determines the corrosion resistance and biocompatibility of titanium and its alloys. The purpose of this study was to evaluate the electrochemical properties of titanium-silver alloys and the surface characteristics of passive film in artificial saliva.We designed titanium-silver alloys with silver contents ranging from 0 to 5 at.%, in 1% increments. These alloys were arc-melted, homogenized, hot-rolled to 2 mm thickness, and finally solution heat-treated for 1 h and quenched. Potentiostatic testing was performed, and the open circuit potentials of the alloys were measured in artificial saliva, at 37°C. The passive films of the titanium-silver alloys were analyzed via XPS.Titanium-silver alloys maintained low current density and showed stable passive region and also had high open circuit potential as compared with pure titanium. The open circuit potential of titanium-silver alloys increased as silver addition increased. With regard to the fraction of oxygen species, a component of over 80% was found to be comprised of oxide. Therefore, the titanium surface mainly consisted of titanium oxide and, on the titanium-silver alloys, this film was composed of TiO 2 , Ti 2 O 3 , and TiO. As silver content increased, the TiO 2 fraction also increased, as did the thickness of the titanium oxide layer formed.

Properties of experimental titanium‐silver‐copper alloys for dental applications

“…There are several reports on the mechanism for the high corrosion resistance of Ti‐noble metal alloys 7, 10, 11. Silver has a much higher electromotive force than titanium, which brings about the selective dissolution of the alloying elements with a lower electromotive force among the alloying elements 7.…”

“…Moreover, titanium‐silver alloys have thicker oxide layers in artificial saliva than pure titanium. It can be assumed that the addition of silver to titanium plays an important role in the formation of a thick passive film on the alloy surface 11…”

Fabrication and characterization of the microporous and nanoporous anodic oxidations of titanium–silver alloys

“…[17,19] Ti-Ag alloy plates (10 × 10 × 1 mm 3 ) were used as the experimental group. Specimens were pretreated in the same manner as cp Ti.…”

Surface modification of titanium alloy with the Ti3Al + TiB2/TiN composite coatings

“…[1][2][3][4] Laser cladding is an available surface modifying technique that can greatly improve the wear resistance of titanium alloys. [5,6] Nitriding and boriding are the most effective ways to improve the wear resistance of steel.…”