Anodizing of magnesium alloy AZ31 in alkaline solutions with silicate under continuous sparking

Chai, Liyuan; Yu, Xia; Yang, Zhihui; Wang, Yunyan; Okido, Masazumi

doi:10.1016/j.corsci.2008.08.038

Cited by 145 publications

(69 citation statements)

References 10 publications

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“…Truong et al and Kannan et al reported corrosion resistant polymer films on magnesium [8,9]. The corrosion problem of magnesium 4 still remains however, and an effective coating for corrosion protection is still needed.…”

Section: Introductionmentioning

confidence: 99%

Corrosion resistant TiO2 film formed on magnesium by liquid phase deposition treatment

Fujita

Sakairi

Kikuchi

et al. 2011

Electrochimica Acta

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Liquid phase deposition treatment (LPD) was applied to form a corrosion protective titanium dioxide (TiO 2 ) film on commercially available pure magnesium. Changing the solution pH, from acidic to highly alkaline, and with the addition of sucrose, it becomes possible to form a highly adhesive and thin TiO 2 film on commercially available pure magnesium without any heat treatment. The role of the sucrose may be attributed to the formation of tetrafluoroboric acid (BF 4 ) -in the solution reducing the homogeneous nucleation of TiO 2 in the LPD solution. The film formed in the weak alkaline environment shows better corrosion resistance than at other LPD conditions, while the average rest potential is the same as that of as-polished specimens. This low rest potential may be due to micro-cracks in the formed film and high activity of the magnesium substrate.

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Section: Introductionmentioning

confidence: 99%

Corrosion resistant TiO2 film formed on magnesium by liquid phase deposition treatment

Fujita

Sakairi

Kikuchi

et al. 2011

Electrochimica Acta

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“…strips, sheets) and extruded products [4,9,15]. Basic strength properties of the AZ31 alloy are presented in Table 1 [1,4,13,18,20].…”

Section: Introductionmentioning

confidence: 99%

“…Over the last decade, MgAl-Zn (AZ) alloys have been of special interest due to their good tensile strength, atmospheric corrosion resistance, good casting properties and small production costs compared with other magnesium alloys. This set of properties makes the AZ alloys useful materials for certain structural applications in the aerospace, automotive and electronic industries [1][2][3][4]. Other advantages of Mg-Al-Zn alloys, as well as of other light-metal alloys like Ti and Al, and of the composites based on their matrixes, are: a high damping coefficient, size stability, stiffness and a high recycling potential [2,[6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Quality of Coatings Deposited on AZ31 Magnesium Alloy Using the Anodising Method / Ocena Jakości Powłok Wykonanych Na Stopie Magnezu Az31 Metodą Anodowania

Wieczorek¹,

Oleksiak²,

Mizera³

et al. 2015

Archives of Metallurgy and Materials

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The paper presents results of a study on the quality of coatings deposited on surfaces of AZ31 magnesium alloy products. In order to obtain protective coatings (corrosion and erosive wear protection), the methods of anodising (specimens A, B and C) and, for comparison, electroless plating (specimen D) were applied. The assessment of coating quality was based on the scratch test results. The results were used for determination of critical loads resulting in coating rupture. The best result was obtained for the specimen B (sulphuric acid anodising in combination with sealing): the critical load was 7.5 N. The smallest value (5.5 N) was observed for the specimen D, i.e. the coating produced using the electroless plating method. Moreover, erosion resistance of the coatings was assessed. In this case, a depth of the wear trace due to an erodent agent (SiC powder) effects was investigated. The results are comparable to those obtained in the scratch test. The poorest erosion resistance is demonstrated by the coating D and the best resistance is observed for the coating B.

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“…The composition and corrosion resistance of PEO films on Mg alloys have been known to be largely dependent upon the solution composition and concentration. PEO treatment of Mg alloys has been conducted in many different aqueous electrolytes containing silicates [4,[14][15][16], fluorides [5,8], phosphates, borates and stannite electrolytes. Verdure et al [17] reported that all the elements in the electrolytes could be included in the PEO films on AM60 Mg alloy.…”

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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Anodizing of magnesium alloy AZ31 in alkaline solutions with silicate under continuous sparking

Cited by 145 publications

References 10 publications

Corrosion resistant TiO2 film formed on magnesium by liquid phase deposition treatment

Corrosion resistant TiO2 film formed on magnesium by liquid phase deposition treatment

Evaluation of the Quality of Coatings Deposited on AZ31 Magnesium Alloy Using the Anodising Method / Ocena Jakości Powłok Wykonanych Na Stopie Magnezu Az31 Metodą Anodowania

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

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