Plasma electrolytic oxidation coatings on Mg alloy with addition of SiO2 particles

Lu, Xiaopeng; Blawert, Carsten; Huang, Yuanding; Ovri, Henry; Zheludkevich, Mikhail L.; Kainer, Karl Ulrich

doi:10.1016/j.electacta.2015.11.033

Cited by 222 publications

(63 citation statements)

References 41 publications

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“…SiO 2 peaks are also visible, indicating that the micro-sized particles are inertly incorporated into PEO coating. This is consistent with our previous investigations [29]. In order to study the influence of electrical parameters on particle uptake, EDS analysis was performed on the surface of all the coated specimens and the Si content is presented in Fig.…”

Section: Phase and Chemical Compositionsupporting

confidence: 64%

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Influence of electrical parameters on particle uptake during plasma electrolytic oxidation processing of AM50 Mg alloy

Blawert

Mohedano

et al. 2016

Surface and Coatings Technology

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The influence of electrical parameters on microstructure and composition of coatings by plasma electrolytic oxidation (PEO) with particle addition was investigated. PEO coatings were produced on AM50 magnesium alloy from an alkaline phosphate based electrolyte (1 g/l KOH + 20 g/l Na 3 PO 4 ) with 5 g/l SiO 2 particle (1-5 µm) addition. Besides the most common electrical parameters (voltage and current density), frequency and duty ratio have effect on the uptake of particles during PEO processing. Higher duty ratio and lower frequency allow to incorporate more particles into the PEO coating. The area of the melting pools, as indicated by the size and area of the open pores on the coating surface, can be considered as one important factor to determine the particle uptake during PEO processing.

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Section: Phase and Chemical Compositionsupporting

confidence: 64%

“…The coatings are composed of two layers, an outer porous layer and an inner barrier layer. A pore band between the outer layer and inner layer is clearly observed, which is normally stated for PEO coatings produced from phosphate based electrolyte [28,29]. (Fig.…”

Section: Accepted M Manuscriptmentioning

confidence: 82%

Influence of electrical parameters on particle uptake during plasma electrolytic oxidation processing of AM50 Mg alloy

Blawert

Mohedano

et al. 2016

Surface and Coatings Technology

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“…플라즈마 전해산화 피막의 형 성 거동 및 산화피막의 특성은 전해질의 화학적 조 성, 농도 및 온도, 인가전류의 크기 및 형태 등의 조건에 영향을 받는다. 그 중, 전해액의 조성 및 농 도는 피막의 형성 및 특성에 결정적인 역할을 하며, 규산염 [7][8][9], 인산염 [10][11][12], 불소 [13][14][15][16] 및 산화티 타늄 [17], 산화세륨 [18], 이산화규소 [19,20] …”

Section: Introductionunclassified

Effects of NaOH Concentration on the Structure of PEO Films Formed on AZ31 Mg Alloy in PO₄^3-and SiO₃^2-Containing Aqueous Solution

Kwon¹,

Moon²

2016

Journal of the Korean institute of surface engineering

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The structure of plasma electrolytic oxidation (PEO) coatings was investigated as a function of NaOH concentration in 0.06 M Na 2 SiO 3 + 0.06 M Na 3 PO 4 solution by using SEM and epoxy replica method. The PEO film was formed on AZ31 Mg alloy by the application of anodic pulse current with 0.2 ms width and its formation behavior was studied by voltage-time curves during the formation of PEO films. It was found that the addition of NaOH into PO 4 3-and SiO 3 2-containing aqueous solution causes a decrease in the PEO film formation voltage, suggesting that dielectric breakdown of the PEO becomes easier with increasing OH -ion concentration in the solution. With increasing OH -ion concentration, thickness of the PEO film increased and surface roughness decreased. The size of pores formed in the PEO layer became smaller and the number of cracks in the PEO layer increased with increasing OH -ion concentration. Based on the experimental results obtained in the work, it is suggested that OH -ions in the solution can contribute not only to the dielectric breakdown but also to the formation of PEO films in the presence of PO 4 3-and SiO 3 2-ions in the solution.

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“…Plasma electrolytic oxidation (PEO) method is one of the promising surface treatment methods for Mg alloys. The PEO treatment method is used to form an anodic oxide film on valve metals using micro arcs generated by dielectric breakdown of the oxide film under high electric field [1][2][3][4][5][6][7][8][9][10][11][12][13]. PEO film on AZ31 Mg alloy has been studied by many authors.…”

Section: Introductionmentioning

confidence: 99%

Anodic Oxide Films Formed on AZ31 Magnesium Alloy by Plasma Electrolytic Oxidation Method in Electrolytes Containing Various NaF Concentrations

Moon¹,

Kwon²

2016

Journal of the Korean institute of surface engineering

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The present work was conducted to investigate the effects of NaF concentration in phosphate and silicatecontaining alkaline electrolyte on the morphology, thickness, surface roughness and hardness of anodic oxide films formed on AZ31 Mg alloy by plasma electrolytic oxidation (PEO) method. The PEO films showed flat surface morphology with pores in the absence of NaF in the electrolyte, but nodular features appeared on the PEO film surface prepared in NaF-containing electrolyte. Numerous pores ranging from 1 to 20 µm in size were observed in the PEO films and the size of pores decreased with increasing NaF concentration in the electrolyte. Surface roughness and thickness of PEO films showed increases with increasing NaF concentration. Hardness of the PEO films also increased with increasing NaF concentration. It was noticed that hardness of inner part of the PEO films is lower than that of outer part of them, irrespective of the concentration of NaF. The low hardness of PEO films was explained by the presence of a number of small size pores less than 2 µm near the PEO film/substrate interface.

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Plasma electrolytic oxidation coatings on Mg alloy with addition of SiO2 particles

Cited by 222 publications

References 41 publications

Influence of electrical parameters on particle uptake during plasma electrolytic oxidation processing of AM50 Mg alloy

Influence of electrical parameters on particle uptake during plasma electrolytic oxidation processing of AM50 Mg alloy

Effects of NaOH Concentration on the Structure of PEO Films Formed on AZ31 Mg Alloy in PO₄^3-and SiO₃^2-Containing Aqueous Solution

Anodic Oxide Films Formed on AZ31 Magnesium Alloy by Plasma Electrolytic Oxidation Method in Electrolytes Containing Various NaF Concentrations

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Plasma electrolytic oxidation coatings on Mg alloy with addition of SiO2 particles

Cited by 222 publications

References 41 publications

Influence of electrical parameters on particle uptake during plasma electrolytic oxidation processing of AM50 Mg alloy

Influence of electrical parameters on particle uptake during plasma electrolytic oxidation processing of AM50 Mg alloy

Effects of NaOH Concentration on the Structure of PEO Films Formed on AZ31 Mg Alloy in PO43-and SiO32-Containing Aqueous Solution

Anodic Oxide Films Formed on AZ31 Magnesium Alloy by Plasma Electrolytic Oxidation Method in Electrolytes Containing Various NaF Concentrations

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Effects of NaOH Concentration on the Structure of PEO Films Formed on AZ31 Mg Alloy in PO₄^3-and SiO₃^2-Containing Aqueous Solution