期刊
INFRARED PHYSICS & TECHNOLOGY
卷 67, 期 -, 页码 63-72出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.infrared.2014.07.009
关键词
Micro arc oxidation; Ceramic coating; Aluminum 6061 alloy; Electrolyte temperature; Pulsed bipolar current mode; Infrared emissivity
6061 aluminum alloy was treated by MAO at various temperatures of the alkali silicate electrolyte using pulsed bipolar current mode for ten minutes. The surface microstructures and properties were studied using SEM, EDX, and XRD. The infrared emissivities of the MAO ceramic coatings were measured at the 70 degrees C using FTIR spectrometer. The electrolyte temperature strongly affected all the surface properties. The MAO alumina ceramics prepared in cold electrolytes have volcano-like and accumulated particles microstructures, while those prepared in hot electrolytes were: rougher, thinner and contained grainy spherical hollow bulgy microstructures with more pore density and more sillimanite and cristobalite phases which enhanced the IR emissivity. Also, the increment of sillimanite and cristobalite phases moved the apparent peaks toward longer wavelengths, and broadened the opaque region of the IR spectra. As a result, the increment of electrolyte temperature from 12.3 degrees C to 90.5 degrees C increased the average of LWIR emissivity from 80.4% to 94.4%, respectively, for the MAO ceramic coatings. (C) 2014 Elsevier B.V. All rights reserved.
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