Structural and electrochemical properties of the catalytic CeO2 nanoparticles-based PEO ceramic coatings on AZ91 Mg alloy

Rehman, Zeeshan Ur; Uzair, Muhammad; Lim, Hyung Tae; Koo, Bon Heun

doi:10.1016/j.jallcom.2017.07.301

Cited by 39 publications

(13 citation statements)

References 45 publications

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“…Various particles including Al 2 O 3 [26], MoS 2 [27], CeO 2 [28], SiO 2 [29], TiO 2 [30] to improve the corrosion behavior, of SiO 2 [29], Si 3 N 4 [31] to improve abrasion behavior and nanoparticles of Ag [32], AgHAp [33], CuO [34,35] to improve the antibacterial performance of PEO coatings produced on Mg and its alloys have been utilized. Among the chemical composition of nanoparticles, HAp is a beneficial and safe option for implants as they are the principal component of human bones [36].…”

Section: Introductionmentioning

confidence: 99%

Effect of ZnO nanoparticles addition to PEO coatings on AZ31B Mg alloy: antibacterial effect and corrosion behavior of coatings in Ringer’s physiological solution

Seyfi

Fattah‐alhosseini

Pajohi‐Alamoti

et al. 2021

Journal of Asian Ceramic Societies

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In this paper, the plasma electrolyte oxidation (PEO) technique was applied to modify the AZ31B Mg alloy surface. Effects of various concentrations of ZnO nanoparticles into an electrolyte with nanoparticles of hydroxyapatite (HAp) on the antibacterial and corrosion behavior of coatings were studied. Potentiodynamic polarization tests were done in Ringer's electrolyte to study the coatings corrosion behavior. Results of XRD indicated that the provided PEO films mostly have phases of HAp, MgO, and Mg 3 (PO 4 ) 2 and ZnO. The results indicated that increasing the concentration of ZnO nanoparticles raised the thickness, roughness, and wetting angle and also enhanced the coatings antibacterial activity. The inhibition percentage of bacterial growth for the specimen with the highest concentration of nanoparticles (4 g/L) after 6 h against E. coli and S. aureus was 23.5% and 45.5%, respectively. The concentration of nanoparticles had no major effect on the porosity size of the ceramic coating. Moreover, adding ZnO nanoparticles declined the corrosion current density and raised the corrosion potential with regard to the metal substrate. The formed coating in the solution containing 1 g/ L ZnO nanoparticles had the highest corrosion behavior among all of specimens that led to a 970 multiplication corrosion resistance of AZ31B Mg alloy.

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Section: Introductionmentioning

confidence: 99%

Effect of ZnO nanoparticles addition to PEO coatings on AZ31B Mg alloy: antibacterial effect and corrosion behavior of coatings in Ringer’s physiological solution

Seyfi

Fattah‐alhosseini

Pajohi‐Alamoti

et al. 2021

Journal of Asian Ceramic Societies

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“…Alkaline silicate or phosphate electrolytes, with various fluoride precursors, are recently attracting the researchers, due to their enhanced mechanical and electrochemical protective properties [11,12]. Several advantages of the fluoride-based species in PEO electrolytic solution have been proposed earlier: formation of a protective barrier film, which offers resistance to pitting corrosion; [13][14][15] assisting the initiation of sparks during the plasma discharge; and improving the hardness of the coatings [12,13]. Though various fluoride species were used for the said purposes, the obtained results are still under examination stage.…”

Section: Introductionmentioning

confidence: 99%

Influence of Complex SiF62− Ions on the PEO Coatings Formed on Mg–Al6–Zn1 Alloy for Enhanced Wear and Corrosion Protection

2020

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The present study was carried out to explore the effect of SiF62− incorporation and concentration on the plasma electrolytic oxidation (PEO) coatings formed on AZ61 Mg alloy. The coatings were prepared using electrolyte solution with various concentration of Na2SiF6 (0.0–0.7 g/L). Highly compact coatings with minimum porosity were obtained for an optimum concentration of Na2SiF6 ~0.3 g/L added into the electrolyte. The highest corrosion resistance, ~2.04 × 105 Ω·cm2, was obtained for 0.3 g/L of Na2SiF6, in addition to its superior anti-wear properties. However, it was found from the scanning electron microscope (SEM) image analysis that increasing concentration above 0.3 g/L, could cause severe breakdown in the inner layers, and thus the said coatings could not withstand effectively against wear and corrosion.

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“…Therefore, extensive studies have been carried out in multiple directions to optimize the PEO coatings for enhanced anti-corrosion properties, e.g., coating composition and microstructure [6,7], barrier layer property [5,8], coating thickness, etc. Thus, new electric parameters [9,10], electrolyte compositions [7,11,12] and pre-treatments [13,14] have been developed to enhance the corrosion resistance of PEO coatings. Recently, the use of K 2 ZrF 6 additive and two-step PEO coating have achieved prominent interest among the PEO research community.…”

Section: Introductionmentioning

confidence: 99%

Effect of K2ZrF6 Concentration on the Two-Step PEO Coating Prepared on AZ91 Mg Alloy in Alkaline Silicate Solution

2020

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In this study, a two-step Plasma Electrolytic Oxidation (PEO) method with constant primary step parameters and varying K2ZrF6 concentration in the secondary electrolyte solution was carried out to obtain a hard and dense coating on AZ91D alloy. For lower concentrations of K2ZrF6, a mixture of granular and pancake structure with higher surface porosity was obtained. Increasing the concentration up to 6 g/L caused the granular structure to disappear and a significant decrease was observed in the surface porosity as well as inner layer damage. Due to the compact inner layer structure, significant improvement in the corrosion resistance and mechanical properties of the AZ91 was observed with K2ZrF6 concentration. Highest values of hardness and corrosion resistance, i.e., 1589.45 HV and 386.30 × 103 Ω cm2, respectively, were obtained for a 6 g/L K2ZrF6 concentration.

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Structural and electrochemical properties of the catalytic CeO2 nanoparticles-based PEO ceramic coatings on AZ91 Mg alloy

Cited by 39 publications

References 45 publications

Effect of ZnO nanoparticles addition to PEO coatings on AZ31B Mg alloy: antibacterial effect and corrosion behavior of coatings in Ringer’s physiological solution

Effect of ZnO nanoparticles addition to PEO coatings on AZ31B Mg alloy: antibacterial effect and corrosion behavior of coatings in Ringer’s physiological solution

Influence of Complex SiF62− Ions on the PEO Coatings Formed on Mg–Al6–Zn1 Alloy for Enhanced Wear and Corrosion Protection

Effect of K2ZrF6 Concentration on the Two-Step PEO Coating Prepared on AZ91 Mg Alloy in Alkaline Silicate Solution

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