Protective oxide coatings on Mg-Mn-Ce, Mg-Zn-Zr, Mg-Al-Zn-Mn, Mg-Zn-Zr-Y, and Mg-Zr-Nd magnesium-based alloys

Sinebryukhov, Sergey L.; Сидорова, М В; Egorkin, Vladimir S.; Недозоров, П. М.; Ustinov, A. Yu.; Волкова, Е. Ф.; Gnedenkov, Sergey V.

doi:10.1134/s2070205112060147

Cited by 19 publications

(8 citation statements)

References 7 publications

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“…During plasma electrolytic oxidation of Mg–Zn–Zr, Mg–Al–Zn–Mn, Mg–Zn–Zr–Y and Mg–Zr–Nd alloys, the anodised layers had very similar chemical composition. 176 Thus, the chemical and phase composition of the oxides is practically independent on the alloy anodised. Although ZE41alloy contained 0·75–1·75 wt-% of rare earth elements, a porous oxide film was obtained after anodising.…”

Section: Oxidation Of Mg Alloys Modified With Resmentioning

confidence: 99%

The reactive element effect on high-temperature oxidation of magnesium

Czerwiński

2015

International Materials Reviews

101

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It was discovered over 75 years ago that minor additions of elements with high affinity to oxygen exert a profound effect on oxidation resistance of many metals and alloys. In this report, progress in understanding the 'reactive element effect' (REE) and opportunities created for controlling the high-temperature oxidation of magnesium alloys were reviewed. Magnesium, the lightest structural metal, exhibits high affinity to oxygen and, as opposed to heat-resistant materials, does not form a dense, slow-growing and protective oxide layer. However, additions of small amounts of reactive elements (REs) to magnesium alloys produce a number of positive effects in improving their oxidation resistance. What is of crucial importance for magnesium is that RE benefits are also extended to its ignition, flammability, evaporation and liquid-state reactivity. The mechanism by which these elements influence oxidation and other related behaviour remains, so far, unclear. Although no specific theory explaining the REE on magnesium has been developed, growth kinetics, surface morphology and internal microstructure of magnesia films and scales, doped with REs show characteristics typical for high-temperature materials that form protective oxides.

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Section: Oxidation Of Mg Alloys Modified With Resmentioning

confidence: 99%

The reactive element effect on high-temperature oxidation of magnesium

Czerwiński

2015

International Materials Reviews

101

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“…The Plasma Electrolytic Oxidation (PEO) [ 11 ] method is environmentally friendly, and the treatment is normally performed in aqueous solutions without the addition of toxic compounds. The formation of PEO coatings is possible on almost all cast and wrought magnesium alloys [ 12 , 13 ], with the result of dense coating structures and good corrosion resistance. These methods, despite very performing, are costly and hardly applicable on the wide scale required at industry and commercial levels, where powder or spray coating are widely employed.…”

Section: Introductionmentioning

confidence: 99%

Low-Cost Biobased Coatings for AM60 Magnesium Alloys for Food Contact and Harsh Environment Applications

Mangolini

Lopresti

Conterosito

et al. 2021

IJMS

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Low-cost, environmentally friendly and easily applicable coating for Mg alloys, able to resist in real world conditions, are studied. Coatings already used for other metals (aluminum, steel) and never tested on Mg alloy for its different surface and reactivity were deposited on AM60 magnesium alloys to facilitate their technological applications, also in presence of chemically aggressive conditions. A biobased PA11 powder coating was compared to synthetic silicon-based and polyester coatings, producing lab scale samples, probed by drop deposition tests and dipping in increasingly aggressive, salty, basic and acid solutions, at RT and at higher temperatures. Coatings were analyzed by SEM/EDX to assess their morphology and compositions, by optical and IR-ATR microscopy analyses, before and after the drop tests. Migration analyses from the samples were performed by immersion tests using food simulants followed by ICP-OES analysis of the recovered simulant to explore applications also in the food contact field. A 30 μm thick white lacquer and a 120 μm PA11 coating resulted the best solutions. The thinner siliconic and lacquer coatings, appearing brittle and thin in the SEM analysis, failed some drop and/or dipping test, with damages especially at the edges. The larger thickness is thus the unique solution for edgy or pointy samples. Finally, coffee cups in AM60 alloy were produced, as real word prototypes, with the best performing coatings and tested for both migration by dipping, simulating also real world aging (2 h in acetic acid at 70° and 24 h in hot coffee at 60 °C): PA11 resulted stable in all the tests and no migration of toxic metals was observed, resulting a promising candidate for many real world application in chemically aggressive environments and also food and beverage related applications.

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“…The range of practical applications of construction and functional materials such as titanium [3][4][5], magnesium [6][7][8], aluminium [9][10] and steel [11,12] might be significantly extended by the application of the plasma electrolytic oxidation (PEO) method to form the protective oxide layer on their surface.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Electrochemical Properties of the PEO-Coatings Treated with Hydrophobic Agent Solution on Aluminium Alloy

Egorkin

Vyaliy

Sinebryukhov

et al. 2015

SSP

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The developed methods of formation and results of the study of the hydrophobic layers on aluminum alloy, previously subjected to plasma electrolytic oxidation (PEO) and additional treatment (either in ethanol solution or under UV-radiation in the presence of ozone plasma) with subsequent deposition of the hydrophobic agent (methoxy-{3-[(2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluoroctyl) oxy] propyl}-silane solution in decane) have been described. It was found, that the formed composite layers possess a hydrophobicity (contact angle higher 157o) and high anticorrosion properties (the impedance modulus, |Z|f=0.01Hz, ranges from 9.2·109 to 4.0·1010 Оhm·cm2 depending on the treatment procedure).

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Protective oxide coatings on Mg-Mn-Ce, Mg-Zn-Zr, Mg-Al-Zn-Mn, Mg-Zn-Zr-Y, and Mg-Zr-Nd magnesium-based alloys

Cited by 19 publications

References 7 publications

The reactive element effect on high-temperature oxidation of magnesium

The reactive element effect on high-temperature oxidation of magnesium

Low-Cost Biobased Coatings for AM60 Magnesium Alloys for Food Contact and Harsh Environment Applications

Evaluation of Electrochemical Properties of the PEO-Coatings Treated with Hydrophobic Agent Solution on Aluminium Alloy

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