Study on the anodizing of AZ31 magnesium alloys in alkaline borate solutions

Wu, Chu-Tsun; Zhang, Z.; Cao, Fahe; Zhang, L.J.; Zhang, J.Q.; Chen, Cao

doi:10.1016/j.apsusc.2006.08.020

Cited by 129 publications

(68 citation statements)

References 22 publications

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“…It is the dissolution of this film that yields to the formation of corrosion products on the electrode surface. This behaviour agrees with the observation of other authors on the same alloy, AZ31 immersed in 3.0 wt% of NaCl [1,32].…”

Section: Discussionsupporting

confidence: 83%

“…It has also excellent specific strength and a low density, only 2/3 that of aluminium, so Mg and its alloys can be used in many applications including computer parts, mobile phones, aerospace components, handheld tools and so on [1][2]. Magnesium alloys are also potentially useful for bone implants and stent applications due to their low density, inherent biocompatibility and adequate mechanical properties including a fracture toughness higher than that of ceramics [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Several treatments to protect magnesium against corrosion have been proposed such as magnesium purification [11], fluoride conversion coatings [12], alloying with other elements, anodizing, [1,11,13], etc. Several studies [14][15][16][17][18][19][20] have shown that the corrosion behaviour of Mg alloys is significantly dependent on the microstructure and particularly on the amount and distribution of the intermetallic phases and the grain size.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion behaviour of AZ31 magnesium alloy with different grain sizes in simulated biological fluids☆

et al. 2010

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The comparative study of the corrosion behaviour of the AZ31 magnesium alloy with different grain sizes immersed in simulated body fluids was made in chloride solutions (8g/L) and Phosphate Buffer-containing Solution (PBS). The influence of the immersion time was also analysed. Electrochemical techniques such as the open circuit potential, polarization curves, current transients and electrochemical impedance spectroscopy, complemented with scanning electron microscopy and energy dispersive spectroscopy were used. Immediately after the immersion in the corrosive media the corrosion resistance was similar for both grain sizes of the AZ31 alloy and higher in 2 NaCl solutions than in PBS. However, this corrosion behaviour was reversed after longer periods of immersion due to the stabilizing of the corrosion products of MgO and/or Mg(OH) 2 with P-containing compounds. These P-compounds contribute to a higher level of protection by hindering the aggressive action of chloride ions. The best corrosion behaviour of the AZ31 alloy was obtained for the finest grain alloy associated with the highest transfer resistance value, after long periods of immersion in PBS.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion behaviour of AZ31 magnesium alloy with different grain sizes in simulated biological fluids☆

et al. 2010

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“…The corrosion resistance was improved greatly; however, MAO coatings still exhibited poor corrosion resistance [15]. The porous microstructure might offer a beneficial surrounding for cells [16][17][18][19], but MgO exhibited poor biological activity. Calcium and phosphorus coatings on magnesium alloy were potential biomaterials [20,21].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and corrosion resistance of ultrasonic micro-arc oxidation biocoatings on magnesium alloy

Liu

et al. 2013

J Adv Ceram

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Abstract:The ultrasonic micro-arc oxidation (UMAO) was used to fabricate ceramic coatings on magnesium alloy. UMAO coatings were produced at 60 W input ultrasonic. The effects of the ultrasound on the microstructure, phase composition, elemental distribution and corrosion resistance of the coatings were extensively investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectrometry (EDX) and electrochemical workstation. The results showed that ultrasound improved the homogeneous distribution of micro-porous structure. The coatings were mainly composed of MgO ceramic and small amount of calcium and phosphorus with porous structure. The Ca/P ratio of the coatings increased when 60 W ultrasonic was used. The corrosion potential in simulated body fluid (SBF) changed from 1.583 V of bare magnesium alloy to 0.353 V of magnesium alloy coated under 60 W ultrasonic. The corrosion resistance of UMAO coatings was better than that of MAO coatings.

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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 have been conducted in many different aqueous electrolytes containing silicates 5,6,[15][16][17] , fluorides 10,11,18) , phosphates 3,19) , borates 20) and stannate electrolytes 21) . Verdier et al…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydroxide and Silicate ions on the Plasma Electrolytic Oxidation of AZ31 Mg Alloy

Moon¹,

Yang²,

Na³

2014

Journal of the Korean institute of surface engineering

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Formation behavior of PEO (Plasma Electrolytic Oxidation) films on AZ31 Mg alloy was studied in aqueous solutions containing various concentrations of hydroxide ion (OH − ) and silicate ion (SiO 3 2− ) by voltage-time curves, and corrosion resistance of the PEO film-covered specimen was investigated by immersion test in 0.5 M NaCl solution. From the analyses of the voltage-time curves, it is suggested that two different types of anions are essentially needed for the formation of PEO films on AZ31 Mg alloy: film formation agent and local film breakdown agent. SiO 3 2− ion acts only as a film formation agent but OH -ion acts not only as a film formation agent but also film breakdown agent. The PEO films prepared on AZ31 Mg alloy in alkaline silicate solution showed very good corrosion resistance without any pitting or filiform corrosions up to 480 h of immersion in 0.5 M NaCl.

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Study on the anodizing of AZ31 magnesium alloys in alkaline borate solutions

Cited by 129 publications

References 22 publications

Corrosion behaviour of AZ31 magnesium alloy with different grain sizes in simulated biological fluids☆

Corrosion behaviour of AZ31 magnesium alloy with different grain sizes in simulated biological fluids☆

Microstructure and corrosion resistance of ultrasonic micro-arc oxidation biocoatings on magnesium alloy

Effects of Hydroxide and Silicate ions on the Plasma Electrolytic Oxidation of AZ31 Mg Alloy

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