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Research Papers

Nanostructured Aluminum Oxide Black Coating: Electrochemical, Mechanical, and Optical Characterizations

[+] Author and Article Information
Ahmed M. Awad

Chemical Engineering and Pilot Plant Department,
National Research Centre,
33 Bohouth Street,
Dokki, Giza 12311, Egypt
e-mail: awadx1@yahoo.com

Maha F. Shaffei, Hala S. Hussein

Chemical Engineering and Pilot Plant Department,
National Research Centre,
33 Bohouth Street,
Dokki, Giza 12311, Egypt

1Corresponding author.

Manuscript received April 3, 2015; final manuscript received June 17, 2015; published online July 23, 2015. Assoc. Editor: Roger Narayan.

J. Nanotechnol. Eng. Med 6(1), 011002 (Jul 23, 2015) (5 pages) Paper No: NANO-15-1024; doi: 10.1115/1.4030920 History: Received April 03, 2015

Nanoporous anodized aluminum oxide (AAO) template is continuously investigated since it is vital for producing a variety of promised nanomaterial. In this study, two steps anodization of aluminum working electrode was carried out in H2SO4 under control of temperature at 17 °C and revolution rate 150 rpm using thermostatic cooling system and revolution control mechanical stirrer, respectively. Different times 15 mins, 30 mins, and 45 mins of first anodization were used and followed by electrolytic detachment for 1 min. Then, second anodization was applied for 10 mins, 20 mins, 30 mins, and 40 mins. Each sample of the prepared nanoporous AAO was used as working electrode into the electrolytic coloring cell containing coloring salt solution of 40 g/l CuSO4. Copper ions were deposited into the porous layer by AC current with gentle agitation using magnetic stirrer. The surface was characterized by field-emission scanning electron microscope device (FESEM), atomic force microscope (AFM), microhardness, corrosion resistance, and optical characteristics. The optical characteristics and reflectivity measurements revealed that the prepared selective coating is promised for solar heating systems and solar water heaters (SWH).

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Figures

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Fig. 1

Scheme of work depicts different samples (S1–S12) electrolytically colored at different conditions: first anodization time—15 mins, 30 mins, and 45 mins and second anodization time—10 mins, 20 mins, 30 mins, and 40 mins

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Fig. 2

Three different regions appeared after two steps anodization and electrolytic coloring: region 1, virgin surface of Al substrate; region 2, second anodized nanoporous AAO region after two steps anodization; and region 3, black colored region after electrodeposition of Cu2+

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Fig. 3

FESEM image of top surface of nanoporous AAO after second anodization and coloring steps

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Fig. 4

Cross section FESEM of nanoporous AAO after second anodization and coloring steps

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Fig. 5

AFM (1 μm × 1 μm) of nanoporous AAO after second anodization and coloring steps

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Fig. 6

Measurements of hardness of nanoporous AAO after second anodization and coloring steps

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Fig. 7

Influence of second anodization time on Cu content after electrodeposition into nanoporous AAO oxide film at different first anodization times

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Fig. 8

Effect of two steps anodization time on the Tafel plot and corrosion current in 0.5 M HCl of samples S1–S12 colored by Cu deposition

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Fig. 9

Variation of corrosion current and polarization resistance with different times of first and second anodization times

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Fig. 10

Reflectivity of the surface after electrolytic coloring of prepared nanoporous AAO layer

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