Modification of a Ti–Mo alloy surface via plasma electrolytic oxidation in a solution containing calcium and phosphorus

Abstract

a b s t r a c tInvestigations into the surface modification of a Ti-15Mo alloy via plasma electrolytic oxidation are reported. The oxidation process was conducted in a solution containing Ca(H 2 PO 2 ) 2 , H 3 PO 4 , or (HCOO) 2 Ca. Anodisation was performed at voltages in the range of 100-400 V. The morphology of the sample surface did not change during alloy oxidation at lower voltages. Higher voltages led to the incorporation of calcium and phosphorus or of calcium only into the formed oxide layer and to significant modification of the surface morphology. Based on the SEM and EDX analysis results, a set of samples was selected for further investigations. To study the surface of the Ti-Mo alloy after anodic oxidation, we used scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), thin-layer X-ray diffraction (TL-XRD), and X-ray photoelectron spectroscopy (XPS). The electrochemical characteristics of the modified alloy in Ringer's solution were determined. Anodisation results in a considerable increase in the corrosion resistance of the Ti-15Mo alloy.

Alginate Biopolymer Coatings Obtained by Electrophoretic Deposition on Ti15Mo Alloy

“…Before EPD, each bath was stirred magnetically for 24 h. Tested samples of Ti15Mo alloy in the form of disks were cut from the rod of 10 mm in diameter, and grounded with 80 to 5000# grit silicon carbide paper. The samples were ultrasonically cleaned using acetone and depassivated for 1 min in solution containing H 2 SO 4 (4 mol dm −3 ) and HF (1 mol dm −3 ) [3], and then rinsed with nanopure water. The sample under investigation was placed inside a self-designed teon holder which contained O-ring.…”

“…Addition of molybdenum is an excellent stabilizer of β-titanium (body-centred cubic crystal structure) phase. Furthermore, Mo reduces the modulus of elasticity and increases corrosion resistance as well as biocompatibility due to the ability to spontaneous passivation resulting in oxide layer formation which is characterized by a high electrochemical stability [3,4]. This layer has the ability to self-repair if damaged, known as self-passivation.…”

The Influence of the Electrolyte Nature and PEO Process Parameters on Properties of Anodized Ti-15Mo Alloy Intended for Biomedical Applications

“…Simka et al [16] O with pH = 3.44 (series 11). The main reason for choosing these combinations of compounds was their comparatively high solubility in water, which allowed using more concentrated solutions.…”

Semi-Conducting Properties of Titanium Dioxide Layer on Surface of Ti-15Mo Implant Alloy in Biological Milieu

“…Titanium and its alloys with mechanical properties similar to the human bones, low weight and Young modules, high biocompatibility, biological inertness, and good corrosion resistance are excellent materials for biomedical applications [1][2][3][4]. Among these materials, a Ti15Mo alloy can be distinguished.…”

“…Among these materials, a Ti15Mo alloy can be distinguished. Addition of Mo increases the corrosion resistance simultaneously reducing the elastic modulus [4]. Moreover, because of the high oxygen affinity of Ti and its alloys, the Ti-15Mo alloy is self-passivated material and is covered with a stable oxide layer which is strongly adherent to the surface and protects it against harmful environmental factors, e.g.…”