Influence of post-treatment on the corrosion resistance of PEO coated AM50B and AM60B Mg alloys

Malayoğlu, U.; Tekin, Kadir Cihan; Shrestha, Suman

doi:10.1016/j.surfcoat.2010.08.022

Cited by 144 publications

(63 citation statements)

References 14 publications

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“…The results show that the majority of samples involve a higher corrosion resistance as compared to the base alloy, except for samples coated in silicatebased electrolytes with nanoparticles. As it has been reported by other authors, corrosion resistance of PEO coated Mg alloys doesn't significantly improve compared to uncoated ones unless some post processing to be done on coated samples [27][28][29]. This might be attributed to the nature of porous PEO coating.…”

Section: Polarization Testmentioning

confidence: 86%

Wettability and corrosion of alumina embedded nanocomposite MAO coating on nanocrystalline AZ31B magnesium alloy

Gheytani

Mahmood

Bagheri

et al. 2015

Journal of Alloys and Compounds

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Section: Polarization Testmentioning

confidence: 86%

Wettability and corrosion of alumina embedded nanocomposite MAO coating on nanocrystalline AZ31B magnesium alloy

Gheytani

Mahmood

Bagheri

et al. 2015

Journal of Alloys and Compounds

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“…The pores compromise the corrosion resistance of such coatings, particularly in the presence of Cl − ions, and this may restrict any future potential application of PEO on Mg alloys. Different surface post-treatment approaches for PEO coatings were suggested including organic, sol-gel and polymer coatings in order to avoid the early failure of PEO coatings on Mg alloys due to their permeability to the environment [29][30][31]. Among these, the Ce-based postsealing treatments for PEO on Mg can be considered as one of the most promising candidates in terms of costs, efficiency and environmental compatibility [32,33].…”

Section: Introductionmentioning

confidence: 99%

Cerium-based sealing of PEO coated AM50 magnesium alloy

Mohedano

Blawert

Zheludkevich

2015

Surface and Coatings Technology

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a b s t r a c t a r t i c l e i n f o Available online xxxx Keywords: Magnesium PEO Cerium Sealing CorrosionEnvironmentally friendly Ce-based sealing post-treatments were developed for PEO coatings on AM50 magnesium alloy. The influence of the Ce(NO 3 ) 3 concentration in the Ce bath and the time of the sealing process were evaluated in terms of morphological and structural properties using SEM, EDS and XRD. Ce content in the layer increased with both the amount of salt in the solution and the time of the sealing post-treatment process due to a higher Ce product accumulation into the pores and cracks of the coatings. Sealed PEO coatings revealed an improvement in the corrosion protection properties as measured by electrochemical impedance spectroscopy. Differences in the corrosion resistance values for the sealed coatings indicate a strong relation between the parameters of the sealing process and its effectiveness, showing higher resistance for the sealed PEO coating developed after 3 h of immersion in 10 g/l Ce(NO 3 ) 3 sealing bath.

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“…Some corrosion inhibitors 23) or ceramic particles 24,25) were added into the PEO electrolyte or surface pretreatment 26) to improve the corrosion resistance of PEO films. Sealing of the PEO films to improve their corrosion protective property has been tried by immersion in boiling water 11,27) , alkaline phosphate and silicate 28) , stannate 29) and E-paint solution 30) , solgel coatings 27,28,31) and polymer or organic coatings 27,32) . Although a number of such works have been conducted to elucidate the effects of electrolyte compositions on the formation of PEO films on Mg alloys, still there is lack of information about the effects of OH -and SiO 3 2− ions in aqueous electrolyte on the formation and corrosion protective properties of PEO film formed on AZ31 Mg alloy.…”

Section: )mentioning

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.

show abstract

Influence of post-treatment on the corrosion resistance of PEO coated AM50B and AM60B Mg alloys

Cited by 144 publications

References 14 publications

Wettability and corrosion of alumina embedded nanocomposite MAO coating on nanocrystalline AZ31B magnesium alloy

Wettability and corrosion of alumina embedded nanocomposite MAO coating on nanocrystalline AZ31B magnesium alloy

Cerium-based sealing of PEO coated AM50 magnesium alloy

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

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