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Open AccessArticle

Structure and Infrared Emissivity Properties of the MAO Coatings Formed on TC4 Alloys in K2ZrF6-Based Solution

by Guangrui Gao 1,2,3,*, Ying Li 1,*, Dan Hu 3 and Zhengping Xi 1
1
School of Metallurgy, Northeastern University, Shenyang 110819, China
2
Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China
3
Xi’an Surface Material Protection Co, Ltd., Xi’an 710016, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(2), 254; https://doi.org/10.3390/ma11020254
Received: 16 January 2018 / Revised: 26 January 2018 / Accepted: 6 February 2018 / Published: 7 February 2018
Micro-arc oxidation (MAO) ceramic coatings were formed on TC4 alloy surface in silicate and metaphosphate electrolytes based with K2ZrF6 for various concentrations. X-ray diffraction (XRD), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) were used to characterize the phase composition, microstructure and chemical compositions of the coatings. The infrared emissivity of the coatings was measured at 50 °C in a wavelength range of 8–20 µm. The microstructural observations all revealed the typical porousstructures. Moreover, adecline in roughness and thickness of the prepared coatings can be observed when the concentration of K2ZrF6 increases. Combined with the results of XRD and XPS, it was found that all the oxides existed as the amorphous form in the coatings except the TiO2 phase. The coatings exhibited the highest infrared emissivity value (about 0.89) when the concentration of K2ZrF6 was 6 g/L, which was possibly attributed to the defect microstructure and the optimal role of ZrO2. View Full-Text
Keywords: micro-arc oxidation; K2ZrF6; coating; infrared emissivity micro-arc oxidation; K2ZrF6; coating; infrared emissivity
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MDPI and ACS Style

Gao, G.; Li, Y.; Hu, D.; Xi, Z. Structure and Infrared Emissivity Properties of the MAO Coatings Formed on TC4 Alloys in K2ZrF6-Based Solution. Materials 2018, 11, 254.

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