Effect of potassium fluoride in electrolytic solution on the structure and properties of microarc oxidation coatings on magnesium alloy

Liang, Jun; Guo, Baogang; Tian, Jun; Liu, Huiwen; Zhou, Jinfang; Xu, Tao

doi:10.1016/j.apsusc.2005.01.007

Cited by 187 publications

(95 citation statements)

References 14 publications

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“…These observations were in agreement with the results of Cai and Liang. 9,12) It was also reported that the barrier layer had an influence on the corrosion resistance of magnesium alloys although the layer existed very thin. 18) In order to evaluate microstructure in the oxide layer in detail, the oxide layer was analyzed using cross-sectional TEM.…”

Section: Characteristics Of Oxide Layer On Az91 Mg Alloymentioning

confidence: 98%

“…Oxide layer coated from Bath B containing fluorine ion consisted of MgO, Mg 2 SiO 4 and MgF 2 . Liang 12) showed that electrolyte containing fluorine ion in the potassium hydroxide-silicate solution played an important role during the initial film formation. Therefore, it was indicated that fluorine ion in the electrolyte participates in the reaction and were incorporated into the oxide layer.…”

Section: Characteristics Of Oxide Layer On Az91 Mg Alloymentioning

confidence: 99%

“…3,11) Some researchers reported that the presence of F À ion played an important role in the formation of oxide layer. 9,12) However, there is a lack of systematic study on the effect of F À ion on corrosion resistance in Mg alloy coated by PEO process. In this study, the influence of potassium fluoride in the electrolyte on the structure of oxide layer of AZ91 Mg alloy was reported and the corrosion resistance was also evaluated by electrochemical analysis.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Resistance of Plasma-Anodized AZ91 Mg Alloy in the Electrolyte with/without Potassium Fluoride

2009

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Plasma Electrolyte Oxidation (PEO) behavior of AZ91 Mg alloy was investigated in the electrolytes with/without potassium fluoride. Growth rate of coating thickness in the electrolyte containing potassium fluoride (Bath B) was much higher than that in the electrolyte without potassium fluoride (Bath A). The oxide layer formed on AZ91 Mg alloy in electrolyte with potassium fluoride and sodium silicate consisted of MgO, MgF 2 and Mg 2 SiO 4 . Corrosion current density of oxide layer coated from the electrolyte with potassium fluoride was much lower than that of oxide layer coated from the electrolyte without potassium fluoride. From the result of EIS analysis, it was known that inner barrier layer in the oxide layer coated from the electrolyte with potassium fluoride had a good influence of the corrosion resistance of Mg alloy. The corrosion resistance curves of Bath B were similar to the thickness curves, indicating that the thickness of the oxide layer played an important role in corrosion resistance of AZ91 Mg alloy. The oxide layer in the Bath B containing potassium fluoride was found to be a compact barrier-type passive film in presence of fluoride ions. The existence of the dense MgO and MgF 2 in the barrier layer had a favorable effect on the corrosion resistance of the AZ91 Mg alloy formed from Bath B by PEO process.

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Section: Characteristics Of Oxide Layer On Az91 Mg Alloymentioning

confidence: 98%

Section: Characteristics Of Oxide Layer On Az91 Mg Alloymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion Resistance of Plasma-Anodized AZ91 Mg Alloy in the Electrolyte with/without Potassium Fluoride

2009

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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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Effect of potassium fluoride in electrolytic solution on the structure and properties of microarc oxidation coatings on magnesium alloy

Cited by 187 publications

References 14 publications

Corrosion Resistance of Plasma-Anodized AZ91 Mg Alloy in the Electrolyte with/without Potassium Fluoride

Corrosion Resistance of Plasma-Anodized AZ91 Mg Alloy in the Electrolyte with/without Potassium Fluoride

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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Effect of potassium fluoride in electrolytic solution on the structure and properties of microarc oxidation coatings on magnesium alloy

Cited by 187 publications

References 14 publications

Corrosion Resistance of Plasma-Anodized AZ91 Mg Alloy in the Electrolyte with/without Potassium Fluoride

Corrosion Resistance of Plasma-Anodized AZ91 Mg Alloy in the Electrolyte with/without Potassium Fluoride

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