Electrochemical performance of microarc oxidation films formed on AZ91D magnesium alloy in silicate and phosphate electrolytes

Cai, Qizhou; Wang, Lishi; Bo-kang, Wei; Liu, Quanxin

doi:10.1016/j.surfcoat.2005.05.039

Cited by 183 publications

(102 citation statements)

References 12 publications

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“…Even though PEO of magnesium alloys can be accomplished in many different electrolytes, silicate and phosphate based electrolytes are the most widely employed electrolytes even today [19][20][21][22][23][24]. In our previous work [21], the electrochemical behaviour of PEO coated AM50 magnesium alloy produced from silicate and phosphate electrolytes in 0.1 M NaCl solution was reported.…”

Section: Introductionmentioning

confidence: 99%

Influence of chloride ion concentration on the electrochemical corrosion behaviour of plasma electrolytic oxidation coated AM50 magnesium alloy

Liang

Srinivasan

Blawert

et al. 2010

Electrochimica Acta

141

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The electrochemical degradation of a silicate-and a phosphate-based plasma electrolytic oxidation (PEO) coated AM50 magnesium alloy obtained using a pulsed DC power supply was investigated using potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) in NaCl solutions of different chloride ion concentrations viz., 0.01M, 0.1M, 0.5M and 1M. The surface of the PEO coated specimens after 50 h of immersion/EIS testing was examined by optical microscopy and scanning electron microscopy. The results showed that the corrosion deterioration of PEO coated magnesium alloy in NaCl solutions was significantly influenced by chloride ion concentration. The silicate-based coating was found to offer a superior corrosion resistance to the magnesium substrate than the phosphate based coatings in lower chloride ion concentration NaCl solutions (0.01 M and 0.1 M NaCl). On the other hand both these PEO coatings were found to be highly susceptible to localized damage, and could not provide an effective corrosion protection to Mg alloy substrate in solutions containing higher chloride concentrations (0.5 M and 1 M). The extent of localized damage was observed to be more with increase in chloride concentration in both the cases.

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Section: Introductionmentioning

confidence: 99%

Influence of chloride ion concentration on the electrochemical corrosion behaviour of plasma electrolytic oxidation coated AM50 magnesium alloy

Liang

Srinivasan

Blawert

et al. 2010

Electrochimica Acta

141

View full text Add to dashboard Cite

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“…15 and 16 show its dissolving rate into water or corrosion rate is quite low (Cai et al, 2006). Increase in thickness of the anodized layer is thought to correspond to the enlargement in the range of sacrificial protection, which means elongated duration in practical use.…”

Section: Discussionmentioning

confidence: 99%

Anodization of Magnesium Alloys Using Phosphate Solution

Murakami¹,

Hino²,

Kanadani³

2011

Magnesium Alloys - Corrosion and Surface Treatments

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“…Aluminum to form MgAl 2 O 4 should be derived mainly from electrolyte, since MgO is a major phase in the coatings formed on AZ91 and AM60 magnesium alloys in aluminate-free alkaline solutions. 13,23,34) …”

Section: Phases In the Peo Coatingsmentioning

confidence: 99%

“…There are a number of studies on PEO coatings of magnesium alloys for corrosion protection. [9][10][11][12][13][14][15][16][17][18][19][20][21][22] The composition, thickness and morphology of the PEO coatings are dependent upon various parameters including electrolyte composition, current density, applied voltage and current wave form. 15,[21][22][23][24] Pulsed DC or AC mode of anodizing is generally used, instead of simple DC anodizing, due to wider possibility of controlling the PEO process.…”

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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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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Electrochemical performance of microarc oxidation films formed on AZ91D magnesium alloy in silicate and phosphate electrolytes

Cited by 183 publications

References 12 publications

Influence of chloride ion concentration on the electrochemical corrosion behaviour of plasma electrolytic oxidation coated AM50 magnesium alloy

Influence of chloride ion concentration on the electrochemical corrosion behaviour of plasma electrolytic oxidation coated AM50 magnesium alloy

Anodization of Magnesium Alloys Using Phosphate Solution

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

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