Correlations of electrolyte state and characteristics of microplasma coatings with quantity of transmitted electricity

Terleeva, O. P.; Slonova, A. I.; Belevantsev, V. I.; Kireenko, I. B.; Ryzhikh, A. P.

doi:10.1134/s2070205111010199

Cited by 10 publications

(5 citation statements)

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“…Regarding conventional anodizing processes such as chromic acid anodizing (CAA) or sulfuric acid anodizing (SAA), ageing of the treatment baths (cleaning, sealing, painting) is controlled empirically by manufacturers who limit the drifts in chemical composition by continuously renewing and tuning the content of chemical reagents. In a recent paper Terleeva et al [19] evidenced the variations in the elemental composition of a silicate-alkaline electrolyte characteristics with ageing time (mainly a decrease in concentration of OH − and Si 4+ and increase in Al 3+ ), expressed in terms of accumulated charge quantity flowing through the investigated electrolyte. Their findings revealed that such variations in the electrolyte have a substantial influence on the PEO coating characteristics such as a decrease in the coating thickness and a substantial increase in the degree of aggregation of electrolyte components (Si, Na, and K) at the top most surface of the oxide layer.…”

Section: Introductionmentioning

confidence: 97%

Influence of electrolyte ageing on the Plasma Electrolytic Oxidation of aluminium

Martin¹,

Leone²,

Nominé³

et al. 2015

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 97%

Influence of electrolyte ageing on the Plasma Electrolytic Oxidation of aluminium

Martin¹,

Leone²,

Nominé³

et al. 2015

Surface and Coatings Technology

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“…The processes at the interface are governed by many external factors and become even more complicated because of the mutual influence of these factors. Apart from providing the general knowledge about the potential of microarc oxidation, studies of microplasma electrochemical processes [1][2][3][4][5][6][7][8] make it possible to create models of the individual stages of this process.…”

Section: Introductionmentioning

confidence: 99%

Dynamic model of single discharge during microarc oxidation

Нечаев

Popova

2015

Theor Found Chem Eng

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A dynamic model of microdischarge with a mobile liquid cathode was presented. The possibility of electron autoemission was substantiated. It was suggested that the liquid cathode rate be calculated by the Navier-Stokes equation. A scheme that shows the development of a plasma formation depending on the thickness of the coating was given. The objects found on the coating surface and in the sludge were shown to correspond to the model.

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“…A gradient structure of thick PEO coatings is known to cause considerable variation in friction coefficients, because the coating layers possess different phase compositions, microstructures, and properties [25,26]. In practice, the consistency (stability) of the mechanical characteristics during the component lifetime is quite important, especially in terms of the average values of the friction coefficient and wear rate.…”

Section: Introductionmentioning

confidence: 99%

Wear Resistant Coatings with a High Friction Coefficient Produced by Plasma Electrolytic Oxidation of Al Alloys in Electrolytes with Basalt Mineral Powder Additions

et al. 2019

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To achieve a better performance of engineering components, modern design approaches consider the replacement of steel with lightweight metals, such as aluminum alloys. However, bare aluminum cannot satisfy requirements for surface properties in situations where continuous friction is needed. Among the various surface modification techniques, plasma electrolytic oxidation (PEO) is considered as promising for structural applications, owing to its hard and well-adhered ceramic coatings. In this work, the surfaces of two Al alloys (2024 and 6061) have been modified by PEO coating (~180 µm) reinforced with basalt minerals, in order to increase the coefficient of friction and wear resistance. A slurry electrolyte, including a silicate-alkaline solution with addition of basalt mineral powder (<5 µm) has been used. The coating composition, surface morphology, and microstructure were studied using X-ray diffraction, scanning electron, and optical microscopy. Linear reciprocating wear tests were employed for the evaluation of the friction and wear behavior. It was found that the coatings reinforced with basalt mineral showed that the wear and friction coefficients reached values 10−6–10−7 (mm3 N−1 m−1) and 0.7–0.85, correspondingly (sliding distance of 100 m). In comparison with the characteristics of resin-based materials (10−5–10−4 (mm3 N−1 m−1) and 0.3–0.5, respectively), the employment of thin inorganic frictional composites may bring considerable improvement in the thermal stability, durability, and compactness, as well as a reduction in the weight of the final product. These coatings are considered an alternative to the reinforced resin composite materials on steel used in frictional components, for example, clutch disks and braking pads. It is expected that the smaller thickness of the active frictional material (180 μm) reduces the volume of the wear products, extending the service intervals associated with filter and lubricant maintenance.

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Correlations of electrolyte state and characteristics of microplasma coatings with quantity of transmitted electricity

Cited by 10 publications

References 0 publications

Influence of electrolyte ageing on the Plasma Electrolytic Oxidation of aluminium

Influence of electrolyte ageing on the Plasma Electrolytic Oxidation of aluminium

Dynamic model of single discharge during microarc oxidation

Wear Resistant Coatings with a High Friction Coefficient Produced by Plasma Electrolytic Oxidation of Al Alloys in Electrolytes with Basalt Mineral Powder Additions

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