Effect mechanism of ultrasound on growth of micro-arc oxidation coatings on A96061 aluminum alloy

He, Donglei; Li, Guolong; Shen, Dejiu; Guo, Changhong; Ma, Haojie; Cai, Jingrui

doi:10.1016/j.vacuum.2014.04.015

Cited by 37 publications

(24 citation statements)

References 7 publications

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“…[15,55] Therefore, an equivalent circuit model with two constant phase elements is applied to fit the data of EIS results (Figure 9a, inset). [56] Herein, R s is the solution resistance. The constant phase elements of CPE 1 and CPE 2 simulate the electrical properties of the outer and inner layers, respectively.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Electrochemical Measurementsmentioning

confidence: 99%

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

et al. 2021

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“…The reduction in the values of Y o / Y n of the oxide layers fabricated in CMC-containing electrolytes compared to that made in electrolytes without CMC additive might be attributed to a drop in the local dielectric constant and/or an increase in the electric double-layer thickness . The relatively low values of n o / n i obtained in the 3CMC sample are attributed to the inhomogeneous deposition of HA and the large micropores …”

Section: Resultsmentioning

confidence: 99%

Synchronized Improvements in the Protective and Bioactive Properties of Plasma-Electrolyzed Layers via Cellulose Microcrystalline

Kaseem

Choe

2022

ACS Biomater. Sci. Eng.

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This study reports synchronized improvements in the protective and bioactive properties of Ti-6Al-4V alloy through the formation of titania-based inorganic layers by considering the role of cellulose microcrystalline (CMC) additive into account. Acetatephosphate-based electrolyte with cellulose CMC is formulated for the first time to modify the porous structure of the oxide layers made via plasma electrolysis of Ti-6Al-4V alloy. The presence of CMC (0, 1, 2, 3 g/L) changed the characteristics of plasma discharges where porous oxide layers with different pore sizes and surface roughness were obtained. A rough oxide layer with large pores was found in the 3 g/L CMC, while a slightly smoother oxide layer with smaller pores was obtained in the case of 2 g/L CMC. The −OH groups in CMC would facilitate the formation of an adsorption layer on the substrate surface, affecting the sparking behavior during plasma electrolysis (PE). Due to a synergy between controlled microstructure, surface roughness, and the insertion of bioactive phases, the coated samples in CMC-containing electrolytes displayed protective and bioactive properties simultaneously. Based on the obtained results, the samples coated in CMC-containing electrolytes can be used as safe implants to replace missing teeth in dental applications.

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“…Furthermore, CPE-n o and CPE-n i were used as an indicator to confirm microstructural results, such as porosity and micropore size, which strongly affect the anticorrosion properties of PEO coatings 31, 32 . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Toward a nearly defect-free coating via high-energy plasma sparks

Kaseem

Yang

2017

Sci Rep

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A nearly defect-free metal-oxide-based coating structure was made on Al-Mg-Si alloy by plasma electrolytic oxidation at high current density accompanying high-energy plasma sparks. The present coatings were performed at two different current densities of 50 and 125 mA/cm2 in the alkaline-phosphate-based electrolytes with different concentrations of sodium hexafluoroaluminate (Na3AlF6). The addition of (Na3AlF6) to the electrolyte used in this study would result in a decrease in the size of the micropore, and a reasonably defect-free coating structure was achieved in the sample treated at high current density of 125 mA/cm2. This was attributed mainly to the hydrolysis of AlF6 3− triggered by intense plasma sparks, which resulted in a uniform distribution of fluorine throughout the coating. Accordingly, the corrosion performance of the coating formed in the electrolyte containing 1.5 g/L Na3AlF6 at 125 mA/cm2 was improved significantly as confirmed by electrochemical impedance analysis. In addition, the formation mechanism of the nearly defect-free coating in the presence of Na3AlF6 was discussed.

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Effect mechanism of ultrasound on growth of micro-arc oxidation coatings on A96061 aluminum alloy

Cited by 37 publications

References 7 publications

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

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

Synchronized Improvements in the Protective and Bioactive Properties of Plasma-Electrolyzed Layers via Cellulose Microcrystalline

Toward a nearly defect-free coating via high-energy plasma sparks

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