Improved Wear and Corrosion Resistance of Microarc Oxidation Coatings on Ti–6Al–4V Alloy with Ultrasonic Assistance for Potential Biomedical Applications

Abstract

Although microarc oxidation is frequently used in producing wear‐ and corrosion‐resistant coatings on Ti and Ti alloys for biomedical applications, the formation of nonuniform microstructure of the coatings is still unavoidable. To overcome this drawback, this work adopts ultrasonic assistance in the microarc oxidation of Ti–6Al–4V and systematically investigates the influences of ultrasonic treatment with different durations on the coating microstructures and resultant properties. The positive effects of ultrasonic, such as cavitation effect, sound flow effect, and mechanical effect, accelerate the cooling rate of electrolyte and promote the homogeneity of the solute on the sample surface. Therefore, the ultrasonic‐assisted coatings exhibit uniform microstructures with fewer cracks and therefore improve performances. For instance, compared with the counterpart without ultrasonic assistance, the ultrasonic‐assisted coating with 15 min duration demonstrates 25.1% lower mass loss in the tribology test and half corrosion density in Hank's solution. Such results indicate that ultrasonic assistance in microarc oxidation of Ti–6Al–4V can homogenize the microstructures of coatings and enhance their corrosion resistance and wear resistance in human body.

A Novel Ti–6Al–4V–xSi Coating with Superior Wear and Oxidation Behavior

“…Figure shows the XRD pattern of the sample after oxidation at 873–1073 K for 100 h. The results demonstrate that the oxidation products are mainly Al 2 O 3 and rutile‐TiO 2 , which in agreement with the results of Wei et al [ 35 ] Table 4 shows the volume fractions of α‐Ti, rutile‐TiO 2 , and Al 2 O 3 phases in the oxidation products of Ti–6Al–4V– x Si coating, which is calculated by fitting the XRD patterns in Figure 8. [ 36 ] The addition of Si will increase the volume fraction of Al 2 O 3 , which is consistent with the results of Dai et al [ 9 ] Moreover, with the increase of oxidation temperature, the volume fractions of Al 2 O 3 and rutile‐TiO 2 increase sharply, but the diffraction peaks of V 2 O 5 and SiO 2 are not detected by XRD. When oxidation temperature increases to 1073 K, the surface of the sample completely transforms into an oxide structure.…”

A New Method for Evaluating the Bond Strength of Plasma-Sprayed NiCrBSi Coatings

“…The surface modification provides significant convenience for enhancing the surface properties of metallic materials [1][2][3]. Generally, the methods of surface modification can be classified as (i) the surface of a substrate could be used as the component of surfacemodified layer, such as laser processing [4][5][6], friction stir processing [7] and micro-arc oxidation [8]; (ii) an external layer is prepared or synthesized on the surface of the substrate, such as thermal spraying [9], laser cladding [10,11] and chemical vapor deposition [12]. Among the methods for preparing the external layers, thermal spray technology is a widely used method that uses metallic and/or ceramic powders as the feedstock and deposits the powders on a substrate in a high-speed and high-temperature way [13,14].…”

Electrochemical Properties of Diluted Al-Mg Alloys With Columnar-To-Equiaxed Transition

“…Several researches about the corrosion behavior and the characteristics of films formed (Song et al, 2019;Xu et al, 2021;Chen et al, 2021). Other previous studies evaluated corrosion susceptibility of Al alloys (Smialowska, 1999;Amin et al, 2008;Boag et al, 2010;Osório et al, 2013;Zhou et al, 2015;Yasakau et al, 2018).…”