Microstructure and corrosion resistance of MAO coatings on AZ31 magnesium

Keyvani, A.; Zamani, M.; Fattah‐alhosseini, Arash; Nourbakhsh, S.H.; Bahamirian, M.

doi:10.1088/2053-1591/aad0d4

Cited by 25 publications

(8 citation statements)

References 21 publications

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“…Where N 0 stands for the initial count (CFU/ml) of the inoculated bacteria and N R stands for the count of the survived bacteria on the surface of specimen after various contact times [43].…”

Section: Surface Characterization and Antibacterial Measurementmentioning

confidence: 99%

“…This means that participated nanoparticles of HAp and ZnO in the production of the coating with no production of a new phase and could not melt under the effect of high discharge energy and then reacted with molten MgO in order to produce a new phase. Stojadinović [41], Bordbar-Khiabani [42], and Keyvani [43,51] reported the inert entry of ZnO particles into the PEO oxide coating. Table 2 provides the results of EDS analysis for coatings that have various concentrations of ZnO nanoparticles, indicating that the coatings are mostly consisted of magnesium, phosphorus, calcium, oxygen, and zinc elements.…”

Section: Phase and Elemental Analyses Of Peo Coatingsmentioning

confidence: 99%

“…In other investigation, the influence of different concentration in the ZnO nanoparticles on the corrosion and bioactivity behaviors of MgO/ZnO nanocomposite coatings applied on AZ91 was studied by Bordbar-Khiabani et al [42] The results indicated that by making an increase in the concentration of ZnO nanoparticles from 0 to 4.5 g/L, the corrosion resistance and bioactivity were augmented. Keyvani et al [43] evaluated the influence of ZnO nanoparticle concentration (0 to 8 g/L) on the corrosion behavior of PEO coatings that were formed on AZ31B alloy in an alkaline solution. They observed that by increasing the concentration of ZnO nanoparticles from 0 to 6 g/L, the percentage of coating porosity was diminished and as a result, the corrosion resistance of the coating increased.…”

Section: Introductionmentioning

confidence: 99%

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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: Surface Characterization and Antibacterial Measurementmentioning

confidence: 99%

Section: Phase and Elemental Analyses Of Peo Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The more the pores or the larger the diameter, the faster the corrosion tendency. It is believed that the large diameter pores of the rolled material at 10m/min cause a high corrosion rate in the first 40 hours [8].…”

Section: Corrosion Testmentioning

confidence: 99%

The Immersion Corrosion Resistance of Shot Peening and MAO Applied on AZ31−0.5% La Sheets

Kara

Ahlatçı

et al. 2020

Eng. Technol. Appl. Sci. Res.

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In this study, the effect of Shot Peening (SP) and Micro Arc Oxidation (MAO) process on the corrosion resistance of 0.5% La with added AZ31 Mg alloy, hot rolled at different rolling speeds, was investigated. It was found that the surface of the rolled material at a rolling speed of 4.7m/min had higher surface smoothness values than the one rolled at 10m/min. It was observed that the corrosion rate changed in the first 40 of 168 hours. In the following hours, the corrosion rate showed different results according to the initial microstructure properties of the base materials. Initially, pore size was the dominant factor determining corrosion resistance, although, after coating, the corrosion rate was affected by the twins formed, based on rolling speed, which enhanced the corrosion rate between 48 and 168 hours.

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“…Many coating methods have been developed to improve the corrosion behavior of magnesium alloys, including thermal spraying, sol-gel, physical vapor deposition, anodizing and chemical vapor deposition [9][10][11][12][13]. PEO is a surface modification technique that applies a thick coating on light metals such as Al, Ti and Mg [14,15].…”

Section: Introductionmentioning

confidence: 99%

Increasing the in-vitro corrosion resistance of AZ31B-Mg alloy via coating with hydroxyapatite using plasma electrolytic oxidation

Chaharmahali

Fattah‐alhosseini

Esfahani

2019

Journal of Asian Ceramic Societies

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This study investigates the effect of hydroxyapatite (HA) coating by plasma electrolytic oxidation (PEO) on the corrosion resistance of AZ31B Mg alloy. The effect of the HA concentration (5, 10 and 15 g.L −1) on the microstructure and corrosion behavior of coatings in the electrolyte was studied. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were used to study the microstructure and composition. Polarization and electrochemical impedance spectroscopy (EIS) tests were applied to the bare and coated samples in simulated body fluid (SBF) to determine the resistance behavior and the kinetics of corrosion coatings. The results showed that HA could be distributed inside the coating along with MgO and Mg 3 (PO 4) 2. Moreover, it was found that the porosity declined and the thickness of coatings increased with increases in the HA concentration. The results also indicated that the corrosion resistance of AZ31B Mg alloy was enhanced by coating with any amount of HA. The highest corrosion resistance was obtained with an electrolyte comprising 15 g.L −1 HA. The lowest corrosion current density (1.99 × 10 −6 A.cm −2) was monitored in respect to the highest corrosion resistance.

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Microstructure and corrosion resistance of MAO coatings on AZ31 magnesium

Cited by 25 publications

References 21 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

The Immersion Corrosion Resistance of Shot Peening and MAO Applied on AZ31−0.5% La Sheets

Increasing the in-vitro corrosion resistance of AZ31B-Mg alloy via coating with hydroxyapatite using plasma electrolytic oxidation

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