Silicate-based Plasma Electrolytic Oxidation (PEO) coatings with incorporated CeO2 particles on AM50 magnesium alloy

Mohedano, M.; Blawert, Carsten; Zheludkevich, Mikhail L.

doi:10.1016/j.matdes.2015.07.132

Cited by 118 publications

(31 citation statements)

References 55 publications

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“…5b, at higher magnification, reveals a characteristic surface morphology of the PEO layer, composed by pores and microcracks [44]. The formation of such a typical morphology was caused by the gas evolution through the molten oxide during the PEO process and the thermal stresses at the sites of the discharge channels [45]. Fig.…”

Section: × 100%mentioning

confidence: 93%

Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31

et al. 2018

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Section: × 100%mentioning

confidence: 93%

Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31

et al. 2018

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“…PEO is an anodizing surface engineering technology used to fabricate ceramic-like coatings on light metals (Mg, Al and Ti) and their alloys [1][2][3]. This technology requires a power supply to provide high voltage that can maintain the dielectric breakdown of the oxide film growing on the surface of a metal anode, and mainly alkaline electrolytes based on silicate, phosphate and/or aluminate [4][5]. Since the investment costs of the equipment are relatively low and the electrolytes are without any pollutant compounds, PEO is considered to be one of the most cost-effective and environmentally friendly ways to provide enhanced corrosion protection, wear resistance, biomimetic and thermal barrier properties for light metals [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of electrode distance impact on PEO coating formation assisted by simulation

Zhang

Blawert

Höche

et al. 2016

Applied Surface Science

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To better understand the influence of electrode distance between anode and cathode during plasma electrolytic oxidation (PEO) process, present study investigates its impact on the coating properties through experiments and assisted simulation. Firstly a model was built to simulate the effect of electrode distance on anode current using COMSOL software package. Complementary, PEO coatings were fabricated on AM50 magnesium alloy in alkaline electrolyte with different electrode distances under constant voltage by a DC power supply. Coating morphology, phase composition and coating thickness were studied at each electrode distance. Through combining the simulation and experiment results, the interaction between electrode distance and coating features is explored. It is demonstrated that under constant voltage mode, PEO coating features on both front and back sides of magnesium samples are affected by electrode distances, which ascribes to the changed current distribution in the bath and related average current density on the surfaces induced by electrode distances.

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“…Numerous attempts such as modifying treatment parameters or introducing various micro-and nanoparticles into electrolytes [7][8][9][10][11][12][13][14][15][16][17] have been made to increase corrosion resistance of PEO coatings. However, none of them was successful.…”

Section: Introductionmentioning

confidence: 99%

Corrosion protection of magnesium alloy by PEO-coatings containing sodium oleate

2019

Int. J. Corros. Scale Inhib.

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The kinetics of plasma-electrolytic oxidation (PEO) coating growth on AZ31 alloy in an alkaline-phosphate-aluminate electrolyte was studied. The structure, elemental composition and corrosion resistance of obtained PEO coatings were studied as a function of thickness. It was established that formation of the coating layers takes place in the following sequence: anodic, external and internal layers. Their formation occurs due to: 1) dielectric layer formation due to anodic conversion of surface; 2) ignition of powerful microdischarges in the transversal pores of the initially formed coating, forming the main part of its outer layer in case of increasing duration of the PEO process; 3) etching of magnesium alloy as a result of electrolyte penetration through the transversal pores to the metal substrate, followed by its anodizing; 4) ignition of microdischarges under the coatings outer layer, leading to formation of an inner layer. Existence of the coating inner layer causes a significant increase in corrosion resistance; however, it is still insufficient for long-lasting standalone corrosion protection. It was shown that sodium oleate (SOl) is the best inhibitor for the AZ31 substrate, therefore it was selected for impregnating PEO coatings. Impregnation of the coatings in 10 mM SOl solution increases their protective ability. Corrosion tests of PEO coated AZ31 samples in a climate chamber showed that the effect of impregnating is most pronounced for thin PEO coatings (20 μm). Under more corrosive conditions of salt spray test, impregnating the PEO coating with SOl increased the time until the appearance of the first corrosion marks. It also significantly slowed down the development of the corrosion marks compared with the samples coated by PEO without impregnation.

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Silicate-based Plasma Electrolytic Oxidation (PEO) coatings with incorporated CeO2 particles on AM50 magnesium alloy

Cited by 118 publications

References 55 publications

Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31

Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31

Investigation of electrode distance impact on PEO coating formation assisted by simulation

Corrosion protection of magnesium alloy by PEO-coatings containing sodium oleate

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