Effect of NH4VO3 concentration on microstructure and properties of thermal control coatings fabricated by micro-arc oxidation on aluminum alloys

Abstract

Abstract: The effects of different concentrations of NH₄VO₃ coloring agent on the morphology, darkness, microstructure, phase composition, corrosion resistance, and thermal control properties of the micro-arc oxidation (MAO) coatings were investigated by incorporating varying concentrations of NH₄VO₃ coloring agent into the electrolyte based on the phosphate-silicate solution system. The results demonstrated that as the concentration of NH₄VO₃ increases, the darkness of the coating gradually decreases while its color intensifies. However, when the concentration exceeds a critical value, coating formation deteriorates. The black appearance of the coating is attributed to V₂O₃ phase formation. The addition of NH₄VO₃ promotes a self-sealing micro-pore phenomenon in the black coating, significantly enhancing its corrosion resistance. Electrochemical detection revealed that corrosion resistance of the black coatings is 5 and 3 orders higher than thatof both substrate and non-colored coatings, respectively. Moreover, maximum absorptance and emittance values for the black coatings are measured as 0.927 and 0.882, respectively. Both thermal control and corrosion resistance properties for a black coating are achieved simultaneous improvement.

Key words: aluminum alloy, micro-arc oxidation, black coating, thermal control, corrosion resistance

CLC Number:

TG174

LI Zheng-qiang, MA Ying, OU Kai-qi, AN Xiao-li, HENG Zhi-dan, WANG Sheng. Effect of NH₄VO₃ concentration on microstructure and properties of thermal control coatings fabricated by micro-arc oxidation on aluminum alloys[J]. Journal of Lanzhou University of Technology, 2025, 51(2): 1-7.

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Effect of NH₄VO₃ concentration on microstructure and properties of thermal control coatings fabricated by micro-arc oxidation on aluminum alloys

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