Features of microarc oxidation coatings formation technology in slurry electrolytes

Malyshev, V. N.; Zorin, K.M.

doi:10.1016/j.apsusc.2007.07.079

Cited by 77 publications

(40 citation statements)

References 3 publications

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“…Up to now, researchers have been making great efforts to overcome this problem. One effort is to adjust the microstructure and composition of ceramic coatings by using a modified electrolyte with additives such as nano/microparticles or sol [24][25][26][27][28][29]. Another effort is to form composite coatings by a combined process including MAO/DLC [30], MAO/sol-gel [31], and MAO/ organic polymer [32].…”

Section: Introductionmentioning

confidence: 99%

Characterization of plasma electrolytic oxidation coatings formed on Mg–Li alloy in an alkaline silicate electrolyte containing silica sol

Liu

Jing

et al. 2009

Materials & Corrosion

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We investigate the influence of silica sol addition on the ceramic coatings of Mg-Li alloy by plasma electrolytic oxidation (PEO) in an alkaline silicate electrolyte. Scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and energy dispersive spectroscopy are employed to characterize the microstructure and composition of the ceramic coatings. The anti-corrosion behavior of the ceramic coatings is evaluated by potentiodynamic polarization measurements in conjunction with electrochemical impedance analysis. The ceramic coating formed in the electrolyte containing silica sol contains SiO 2 and Mg 2 SiO 4 phase and has more uniform morphology and higher corrosion resistance than that formed in the electrolyte without addition of silica sol.

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Section: Introductionmentioning

confidence: 99%

Characterization of plasma electrolytic oxidation coatings formed on Mg–Li alloy in an alkaline silicate electrolyte containing silica sol

Liu

Jing

et al. 2009

Materials & Corrosion

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“…In the past half decade, another characteristic of MAO on Mg alloys, namely composition diversity of electrolytes in contrast with electrolytes of MAO on Al alloys that are mostly composed of simple alkaline silicates/phosphates, was reported in relevant literature [27][28][29][30][31][32][33][34][35][36][37][38][39]. Although alkaline silicates/phosphates are basic electrolytes for MAO of Mg alloys, the compactness of the fabricated coatings is far inferior to that on Al alloys; meanwhile, the main compositions of the fabricated MAO coatings include crystal MgO as well as some electrolyte-related compounds (crystal Mg 2 -SiO 4 , crystal Mg 2 (PO 4 ) 3 or non-crystal compounds) [27,28].…”

Section: Introductionmentioning

confidence: 97%

Product/metal ratio (PMR): A novel criterion for the evaluation of electrolytes on micro-arc oxidation (MAO) of Mg and its alloys

Song

Shan

et al. 2011

Sci. China Technol. Sci.

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Product/metal ratio (PMR) was introduced as a novel criterion for the evaluation of electrolytes on micro-arc oxidation (MAO) of Mg and its alloys. The criterion initially sprang from Pilling-Bedworth ratio (PBR), focused on the roles of electrolytes for the compactness of the fabricated coatings, and took attention on properties of reactants/products during MAO. Meanwhile, based on our experiments as well as the results from literatures, the effects of electrolyte additives on morphologies and compositions of the fabricated MAO coatings of Mg alloys were exploited for verification and supplement of the initial criterion. In combination of the initial PMR criterion and experimental verification, PMR could be represented by special mode (PMR s =V oxide products /V alloy substrates ) and general mode (PMR g = PMR s + PMR d ). The ideal PMR s should be between 1 and 2, while PMR d is related to the coating deposition during MAO. PMR d is a supplement to PMR s when the effect of the overlaying property (O) of the coatings and the effective deposition (D) of electrolyte composites are considered (PMR d =f(O, D). O is related to the melting point (MP) and boiling point (BP) of the MAO products. D is related to the effective reactions between alloy substrates and electrolytes during MAO. micro-arc oxidation, Mg alloys, Pilling-Bedworth ratio, product/metal ratio Citation: Song L W, Song Y W, Shan D Y, et al. Product/metal ratio (PMR): A novel criterion for the evaluation of electrolytes on micro-arc oxidation (MAO) of Mg and its alloys.

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“…Suspensions of Al 2 O 3 [1,3,4], SiO 2 [1] and SiC [5] have been employed to produce coatings with enhanced thermomechanical properties, reduced surface porosity and increased wear-resistance. An increased coating strength has been shown for PEO coatings formed in electrolytes with Al 2 O 3 , TiO 2 , Cr 2 O 3 , ZrO 2 , TiC, B 4 C, BN particles [6]. Alumina films containing *16 wt.% iron have been produced by PEO in an electrolyte containing iron particles [7,8].…”

Section: Introductionmentioning

confidence: 98%

Incorporation of zirconia nanoparticles into coatings formed on aluminium by AC plasma electrolytic oxidation

et al. 2008

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Composite ceramic coatings were formed on aluminium by AC plasma electrolytic oxidation (PEO) using Na 6 P 6 O 18 or Na 2 SiO 3 Á 5H 2 O/KOH electrolytes with monoclinic zirconia nanoparticles in suspension. The coatings grown in Na 2 SiO 3 Á 5H 2 O/KOH electrolyte revealed c-Al 2 O 3 and amorphous phase; a-Al 2 O 3 and AlPO 4 were additionally produced with the Na 6 P 6 O 18 electrolyte. Higher temperature zirconia phases, possibly tetragonal and orthorhombic, in addition to the monoclinic phase, were indicative of elevated temperatures at sites of microdischarges. Further, local melting resulted in zirconium-rich dendrites in the coating formed in silicate electrolyte. Zirconium was mainly located in the relatively compact, outer layer of the coating, constituting *70-90% of the coating thickness. Nanoparticles appeared to be incorporated at the coating surface and following transport to the interface regions between the inner and outer layers along short-circuit paths through the outer coating.

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Features of microarc oxidation coatings formation technology in slurry electrolytes

Cited by 77 publications

References 3 publications

Characterization of plasma electrolytic oxidation coatings formed on Mg–Li alloy in an alkaline silicate electrolyte containing silica sol

Characterization of plasma electrolytic oxidation coatings formed on Mg–Li alloy in an alkaline silicate electrolyte containing silica sol

Product/metal ratio (PMR): A novel criterion for the evaluation of electrolytes on micro-arc oxidation (MAO) of Mg and its alloys

Incorporation of zirconia nanoparticles into coatings formed on aluminium by AC plasma electrolytic oxidation

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