Effects of formation voltage and electrolyte ions concentration on the structure and passivity of anodic films on magnesium

Ono, Satoshi; Miyake, Megumi; Asoh, Hidetaka

doi:10.2464/jilm.54.544

Cited by 17 publications

(6 citation statements)

References 15 publications

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“…It is known that aluminum species are incorporated into the anodic films formed on magnesium and its alloys in aluminate electrolytes. 27,28) aluminate. 23) XRD patterns revealed that no MgAl 2 O 4 peaks are detected in the coating formed in the aluminate-free electrolyte.…”

Section: Discussionmentioning

confidence: 99%

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Influence of Phosphate Concentration on Plasma Electrolytic Oxidation of AZ80 Magnesium Alloy in Alkaline Aluminate Solution

2010

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Plasma electrolytic oxidation of AZ80 magnesium alloy in alkaline aluminate electrolytes develops MgAl 2 O 4 -based highly crystalline oxide coatings with the morphology changing largely with phosphate concentration in electrolyte. The thickness of the coatings increases with phosphate concentration from 5 mm in phosphate-free electrolyte to $70 mm in the electrolyte containing 0.1 molÁdm À3 phosphate after anodizing for 900 s. The formation of the latter thick coating is associated with intense sparking during anodizing. The thick coatings formed in the electrolytes containing 0.075 and 0.1 molÁdm À3 phosphate are highly cracked. In contrast, the coating formed in the electrolyte containing 0.05 molÁdm À3 phosphate is relatively uniform, showing the highest corrosion protection in 0.5 molÁdm À3 NaCl solution. The coatings consist of two layers, comprising an outer thick layer with high concentration of aluminum and an inner thin magnesium-rich layer.

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Section: Discussionmentioning

confidence: 99%

“…[25][26][27][28] Khaselev et al anodized magnesium alloys in alkaline electrolytes containing aluminate [29][30][31] . They found the formation of MgAl 2 O 4 spinel phase under continuous sparking.…”

Section: Introductionmentioning

confidence: 99%

Influence of Phosphate Concentration on Plasma Electrolytic Oxidation of AZ80 Magnesium Alloy in Alkaline Aluminate Solution

2010

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“…Different passive and active states can be found depending on the applied voltage/current, time, substrate, and electrolyte [121]. Studies have investigated many aspects of anodizing Mg, such as electrolyte composition [122][123][124][125], anodizing parameters such as constant voltage or constant current density control modes [120,124,126], substrate effects including substrate type, Mg purity, and alloying element concentration [38,72,120,124,127], and time of anodization [114]. Different electrolytes have been proposed: either an aqueous [114-116, 123-125, 128-132] or nonaqueous [119,133] solutions.…”

Section: Hydroxyapatite (Ha)mentioning

confidence: 99%

“…Ono and Asoh [146] studied anodization of pure Mg in nonaqueous solutions where they showed the formation of a barrier layer in a solution consisting of a mixture of amine, ethylene glycol, and water. They also investigated the formation of anodic oxide films on Mg surfaces in alkalinefluoride solutions [125] and for the first time, using alkaline aluminate solution, they reported formation of cylindrical cellular structures [124].…”

Section: Hydroxyapatite (Ha)mentioning

confidence: 99%

Corrosion Protection and Surface Treatment of Magnesium Alloys Used for Orthopedic Applications

Nassif

Ghayad

2013

Advances in Materials Science and Engineering

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An overview is reported about the history of prevailing magnesium alloys as orthopedic biodegradable materials. Important features of the effect of alloying additions, along with surface treatments for corrosion protection of magnesium alloys, are described. Hydroxyapatite (HA), the promising coat deposited by different direct and electrochemical methods to tailor corrosion resistance and biocompatibility, is discussed. Surface modifications, such as microarc oxidation or anodization which lead to nanostructures fabricated to provide better adhesion for HA coatings, are presented.

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“…Anodization is one of the effective approaches used to slow down the corrosion rate of Mg. Many studies have investigated various aspects of anodization of Mg including the effects of different substrate materials [5][6][7], anodizing process parameters [7][8][9], and electrolytes [9][10][11]. Currently, alkaline electrolyte is used most.…”

Section: Introduction*mentioning

confidence: 99%

The Effects of Primary Oxy-Salts on Anodizing Magnesium Alloy AZ91D

Yun

Xue

Halsall

et al. 2014

J. Coat. Sci. Technol.

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Anodization is known to be an effective way to slow down the initial corrosion rate of magnesium (Mg) and its alloys. Here, we investigated the specific use of oxy-salts to improve the corrosion resistance of anodizing coatings. Oxy-salts of silicate, phosphate, and carbonate were added separately to a sodium hydroxide alkaline electrolyte used to anodize Mg alloy AZ91D. The process was investigated in terms of anodizing behavior, the surface properties, and the corrosion behavior of AZ91D. Anodizing AZ91D using the silicate-containing electrolyte generated sparks, and produced a thicker and more corrosion-resistant layer than the other oxy-salts. In the process, MgO and SiO2 formed Mg2SiO4 at high temperatures. Coatings from the phosphate-and carbonate-containing electrolyte anodizations did not contain phosphorus or carbon. We also studied the effects of silicate concentration on the corrosion resistance and properties of the surface.

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Effects of formation voltage and electrolyte ions concentration on the structure and passivity of anodic films on magnesium

Cited by 17 publications

References 15 publications

Influence of Phosphate Concentration on Plasma Electrolytic Oxidation of AZ80 Magnesium Alloy in Alkaline Aluminate Solution

Influence of Phosphate Concentration on Plasma Electrolytic Oxidation of AZ80 Magnesium Alloy in Alkaline Aluminate Solution

Corrosion Protection and Surface Treatment of Magnesium Alloys Used for Orthopedic Applications

The Effects of Primary Oxy-Salts on Anodizing Magnesium Alloy AZ91D

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