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

Abstract

Plasma electrolytic oxidation (PEO) of Ti-15Mo alloys conducted in electrolytes containing Ca and P compounds can be an efficient process with which to obtain bioactive coatings. This paper reports on the influence of the nature of the electrolyte, its concentration, and PEO process parameters on the properties of anodized layers on Ti-15Mo. A wide range of Ca-and P-containing alkaline and acidic solutions was employed to incorporate Ca and P ions into the anodized layer. The efficiency of the incorporation was evaluated by the Ca/P ratio in the coating as compared to that in the electrolyte. It was found that alkaline solutions are not suitable electrolytes for the formation of good quality, uniform PEO coatings. Only acidic electrolytes are appropriate for obtaining well-adherent homogeneous layers on Ti-15Mo. However, the maximum Ca/P ratios reached in the coatings were rather low (close to 1). The variation of electrical signal (negative-to-positive current ratio, frequency) and time of electrolysis do not result in a substantial change of this value. The processing time, however, did influence the coating thickness. Despite their low Ca/P ratio, the anodized layers demonstrate good biological activity, comparable to pure microrough titanium.

Plasma Electrolytic Oxidation of Metals and Alloys

“…The present Special Issue covers 10 papers: Six articles [1][2][3][4][5][6] discuss the Plasma Electrolytic Oxidation PEO of titanium [2,4,6] and its alloys [1,3,5], two papers talk about the PEO processing of aluminum alloys [7] and composites [8], and one on magnesium alloys [9]. The tenth paper is a review regarding soft sparking issues in PEO [10].…”

“…Banakh et al [5] worked to obtain bioactive coatings on Ti-15Mo alloys using PEO treatment in electrolytes containing Ca and P compounds. The studies were performed to reveal the influence of the nature of the electrolyte, its concentration, and PEO process parameters on the properties of anodized layers.…”

“…Differing from Ti-6Al-4V alloy, which has been routinely used in medicine, these new and advanced titanium alloys do not include vanadium. They are characterized by low Young's modulus and biocompatible alloy elements, and after PEO treatment may be used for medical applications, such as promising metallic implants to bone [1][2][3][4][5][6].…”

Mathematical Modelling of Destabilization Stress Factors of Stable-Elastic Fixation of Distal Trans- and Suprasyndesmotic Fibular Fractures

“…e paper [15] describes the design and engineering of implant manufacturing using additive technologies. e surfaces of biomaterials are subjected to various modifications to affect their physical and chemical properties as well as allow obtaining optimal surface topography [16], such as coatings on operational surfaces of implants [17][18][19]. ese coatings improve surface properties and create effective compositions for combining different characteristics, such as strength, wear resistance, and blocking unwanted heat fluxes [20].…”

Influence of Calcium Acetate Concentration in Electrolyte on Tribocorrosion Behaviour of MAO Treated Titanium

“…Regarding corrosion behaviour, studies show that oxide layers obtained by MAO confer about a one to two decade decrease in corrosion kinetics compared to their Ti or Ti alloy base materials, together with a substantial increase in corrosion potential [7,[13][14][15][16]. On the other hand, biological behaviour studies have shown that MAO layers can have improved cell adhesion, proliferation, and differentiation, as well as antimicrobial properties [4,6,7,[17][18][19][20][21]. Several reports are also available on the tribocorrosion behaviour; however, most of them only report on the evolution of open circuit potential under sliding action, without considering the corrosion kinetics, whereas very little is known about the evolution of kinetics during mechanical action [22,23].…”