Development of vanadium impregnated flat absorber composite PEO coating on AA6061 alloy

Pillai, AM and Rajendra, A and Sharma, AK and Bera, P and Poornima, S and Sampath, S (2021) Development of vanadium impregnated flat absorber composite PEO coating on AA6061 alloy. In: Surface and Coatings Technology, 410 .

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Abstract

The formation of black plasma electrolytic oxidation (PEO) coating on aluminium alloy using vanadyl sulphate as additive in a silicate-based electrolyte is investigated. A brief discussion on the mechanism of incorporation of vanadium in PEO coating starting with a cationic species of vanadium (i.e., VO2+) in solution is attempted. The coating formation with respect to morphology and composition is systematically studied as a function of process time. With increase in process time, incorporation of vanadium ions in the coating increases and the formation of black colour is attributed to the presence of V3+ and V4+ species in the coating. A 55 ± 5 μm thick flat absorber black coating with high solar absorptance (0.92) and high infrared emittance (0.88) is obtained with a process time of 10 min.

Item Type:	Journal Article
Publication:	Surface and Coatings Technology
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Aluminum compounds; Black coatings; Electrolysis; Electrolytes; Silicates; Sulfur compounds; Vanadium compounds, Cationic species; Coating formation; Infrared emittance; Morphology and composition; Plasma electrolytic oxidation; Process time; Solar absorptance; Vanadium ions, Vanadium
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	13 Apr 2023 09:47
Last Modified:	13 Apr 2023 09:47
URI:	https://eprints.iisc.ac.in/id/eprint/80616

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