The characterization of plasma electrolytic oxidation coatings on AZ41 magnesium alloy

Apelfeld, A. V.; Крит, Б. Л.; Ludin, V. B.; Morozova, N. V.; Vladimirov, B. V.; Wu, Ruizhi

doi:10.1016/j.surfcoat.2017.05.048

Cited by 39 publications

(11 citation statements)

References 11 publications

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“…There are two ways to improve its corrosion resistance: Firstly, alloying design and plastic deformation [7][8][9][10] as well as heat treatment [11] are applied to weaken the galvanic corrosion and promote the formation of a compact and stable surface or passive film on the surface of Mg alloys. Secondly, surface modification like chemical conversion treatment [12,13], sol-gel method [14,15] and micro-arc oxidation [16] was widely used to improve the anti-corrosive performance of Mg and its alloys.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of AZ91 Mg Alloy Modified by High-Current Pulsed Electron Beam

Deng

Nie

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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The high-current pulsed electron beam (HCPEB) treatment with current density 6 J/cm 2 was applied on AZ91 Mg alloy to improve its corrosion resistance. Results showed that the net-like Mg 17 Al 12 disappeared on the surface of AZ91 Mg alloy after irradiation by HCPEB, which was instead of supersaturated Al element on the surface. Nevertheless, the application of HCPEB also led to the formation of crater-like and groove-like structures as well as micro-cracks on the surface of AZ91 Mg alloy. After HCPEB treatment by 3, 5 and 10 pulses, the AZ91 Mg alloy exhibited better corrosion resistance. However, the increasing amount of micro-cracks reduced the anti-corrosive properties of AZ91 Mg alloy as the pulse increased to 20 and 30. Keywords High-current pulsed electron beam (HCPEB) Á Corrosion resistance Á Electrochemical impedance spectroscopy (EIS) Á AZ91 Mg alloy Á Microstructure

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Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of AZ91 Mg Alloy Modified by High-Current Pulsed Electron Beam

Deng

Nie

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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“…The corrosion resistance of the fabricated MAO samples is jointly determined by coating characteristics such as coating thickness, surface morphology, phase structure, and the used substrate [3,9,11,13,14,16,17,19,36,[44][45][46]. The thick MAO coating with a uniform surface, a compact inner layer, and chemically stable components can effectively prevent the corrosion solution from penetrating the coating and reacting with magnesium substrate.…”

Section: Influence Of Processing Factors On Corrosion Resistancementioning

confidence: 99%

“…With increasing coating thickness, the corrosion resistance of MAO treated samples increases [13,14]. Besides coating thickness, surface morphology such as micro-cracks, micro pore size, and porosity can effectively influence the corrosion resistance of MAO treated magnesium alloys [3,13,17,45,46]. For example, with an increasing KOH concentration, through porosity also increases and corrosion resistance decreases [46].…”

Section: Influence Of Processing Factors On Corrosion Resistancementioning

confidence: 99%

Investigation on Corrosion Resistance and Formation Mechanism of a P–F–Zr Contained Micro-Arc Oxidation Coating on AZ31B Magnesium Alloy Using an Orthogonal Method

et al. 2019

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In this study, the synergistic effects of NH4HF2, sodium phytate (Na12Phy), K2ZrF6, and treatment time on corrosion resistance of a micro-arc oxidation (MAO) treated magnesium alloy and the entrance mechanism of P, F, and Zr into anodic coatings were investigated using an orthogonal method. In addition, the roles of NH4HF2, Na12Phy, and K2ZrF6 on coating development were separately studied. The results show that NH4HF2 and Na12Phy, the corrosion inhibitors of magnesium alloys, are beneficial but K2ZrF6 is harmful to developing anodic coatings. The corrosion resistance of MAO coatings is synergistically determined by coating characteristics, though the coating thickness plays a main role. Na12Phy significantly improves but NH4HF2 decreases the corrosion resistance of MAO coatings, while excess high K2ZrF6 is harmful to the coating corrosion resistance. Treatment time can increase the coating thickness but is the least important factor in corrosion resistance. During MAO, NH4HF2, Na12Phy, and K2ZrF6 take part in coating formation, causing P, F, and Zr to compete with each other to enter into anodic coatings.

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“…A porous coating material containing nano-to micro-sized pores [4,5] is generated at the locations of microdischarges, with lifetimes in the microsecond to millisecond range [6][7][8], on the substrate surface. The coating material, often oxide-based [9][10][11], is probably formed by a mixture of processes, involving anodic oxidation, thermal oxidation and plasma-chemical reactions under the high temperatures and pressures at the microdischarge sites. Species from both the substrate and the electrolyte are incorporated into the coating, including the possibility of incorporation of nanoparticles if present as an addition to the electrolyte [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Superconducting properties of PEO coatings containing MgB2 on niobium

et al. 2019

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A study has been carried out of superconductivity in coatings formed on niobium by plasma electrolytic oxidation (PEO) in electrolyte containing different concentrations of MgB2. From preliminary experiments, a suitable PEO condition was selected. The coatings were examined by analytical scanning electron microscopy and X-ray diffraction. Superconductivity was assessed using magnetic moment-field measurements. At 6 K, superconductivity of the niobium dominated, which revealed strong flux pinning and sudden release. The latter was more gradual following PEO, indicating pinning was a surface effect. Between the critical temperature of niobium (9.25 K) and MgB2 (about 39 K), the diamagnetic behaviour of superconducting MgB2 was present, with earlier flux penetration the closer the temperature to 39 K. The hysteresis loop indicated stronger flux pinning for lower temperatures, as expected for a superconductor.

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The characterization of plasma electrolytic oxidation coatings on AZ41 magnesium alloy

Cited by 39 publications

References 11 publications

Corrosion Resistance of AZ91 Mg Alloy Modified by High-Current Pulsed Electron Beam

Corrosion Resistance of AZ91 Mg Alloy Modified by High-Current Pulsed Electron Beam

Investigation on Corrosion Resistance and Formation Mechanism of a P–F–Zr Contained Micro-Arc Oxidation Coating on AZ31B Magnesium Alloy Using an Orthogonal Method

Superconducting properties of PEO coatings containing MgB2 on niobium

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