A NOVEL BLACKENING METHOD OF PREPARING ULTRA-BLACKNi–PCOATINGS: EFFECT OF PROCESS PARAMETERS ON MORPHOLOGY AND OPTICAL PROPERTY

Yongzhong Jin (), Kui Yang, Xianguang Zeng and Qingshan Fu
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Yongzhong Jin: The Key Laboratory of Material Corrosion, and Protection of Sichuan Province, Sichuan University of Science and Engineering, 180 Huixing Road, Zigong, Sichuan 643000, P. R. China
Kui Yang: The Key Laboratory of Material Corrosion, and Protection of Sichuan Province, Sichuan University of Science and Engineering, 180 Huixing Road, Zigong, Sichuan 643000, P. R. China
Xianguang Zeng: The Key Laboratory of Material Corrosion, and Protection of Sichuan Province, Sichuan University of Science and Engineering, 180 Huixing Road, Zigong, Sichuan 643000, P. R. China
Qingshan Fu: The Key Laboratory of Material Corrosion, and Protection of Sichuan Province, Sichuan University of Science and Engineering, 180 Huixing Road, Zigong, Sichuan 643000, P. R. China

Surface Review and Letters (SRL), 2015, vol. 22, issue 02, 1-8

Abstract: Ni–Pultra-black coatings were prepared by a novel blackening method of anodic oxidation in nonoxidizing acid media. The effect of the applied voltage, concentration ofH3PO4and anodization time on the microstructure and optical property of blackened coatings was investigated. The results show that the applied voltage plays the most important role during the formation of the ultra-black coatings. The concentration ofH3PO4is the next-important factor, then anodization time. The optimum process parameter for obtaining ultra-black coatings is at 0.9 V in 3 mol/L for 40 min, in which the reflectance is only 0.14–0.21% in the visible region. The low reflectance is mainly attributable to the unique array structure of conical cavities ranging 1–3μm in size, in which the innumerable tiny pits distribute on the cavity wall. In contrast, the black coatings etched by chemical etching method by strong oxidizing acid(HNO3)have larger conical cavities (10–20μm) with smooth cavity wall, and thus lead to higher reflectance of 0.69–2.44%.

Keywords: Black coatings; blackening; anodic oxidation; process parameter; solar absorption (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1142/S0218625X15500171

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