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Technical Brief

Laser Texturing of Plasma Electrolytically Oxidized Aluminum 6061 Surfaces for Improved Hydrophobicity

[+] Author and Article Information
B. S. Yilbas

Mechanical Engineering Department,
King Fahd University of Petroleum & Minerals,
Dhahran 31261, Saudi Arabia
e-mail: bsyilbas@kfupm.edu.sa

A. Matthews

Department of Materials Science and Engineering,
University of Sheffield,
Sheffield S10 2TN, UK
e-mail: a.matthews@sheffield.ac.uk

C. Karatas

Engineering College,
Hacettepe University,
Ankara, Turkey
e-mail: doc_cihan@hotmail.com

A. Leyland

Department of Materials Science and Engineering,
University of Sheffield,
Sheffield S10 2TN, UK

M. Khaled

Chemistry Department,
King Fahd University of Petroleum & Minerals,
Dhahran 31261, Saudi Arabia
e-mail: mkhaled@kfupm.edu.sa

N. Abu-Dheir, N. Al-Aqeeli

Mechanical Engineering Department,
King Fahd University of Petroleum & Minerals,
Dhahran 31261, Saudi Arabia

X. Nie

Mechanical, Automotive and Materials Engineering,
University of Windsor,
Windsor, ON N9B 3P4, Canada
e-mail: xnie@uwindsor.ca

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received December 30, 2013; final manuscript received June 21, 2014; published online August 6, 2014. Assoc. Editor: Y. B. Guo.

J. Manuf. Sci. Eng 136(5), 054501 (Aug 06, 2014) (8 pages) Paper No: MANU-13-1445; doi: 10.1115/1.4027977 History: Received December 30, 2013; Revised June 21, 2014

Laser surface texturing of plasma electrolytically oxidized aluminum 6061 alloy has been carried out through a controlled surface ablation under a high pressure nitrogen gas assistance. Morphological and metallurgical changes in the laser-treated region were examined using optical, scanning electron, and atomic force microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction phase analysis. The hydrophobicity of the textured surface was assessed through water droplet contact angle measurements. It was found that a dense layer with a nanotexture/microtexture is developed at the surface after the laser treatment process. The assessment of the surface characteristics reveals that a superhydrophobic surface results from the laser treatment process; in which case, high water droplet contact angles are measured over the treated surface, which can be explained by known models of texture-induced superhydrophobicity.

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Figures

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Fig. 1

Optical and SEM micrographs of plasma electrolytically oxidized PEO and after the laser treatment of PEO surfaces: (a) optical photograph showing laser treated and PEO surface, (b) laser-treated PEO surface, (c) PEO surface, (d) close view of laser treated PEO surface, and (e) close view of PEO surface

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Fig. 2

AFM images of laser-treated PEO surfaces: (a) 3D view of laser textured surface and (b) surface roughness

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Fig. 3

SEM micrographs of cross section of laser-treated and PEO layers: (a) laser-treated layer and heated regions due to overlapping of laser irradiated spots, (b) PEO layer, (c) dense layer with fine grains in laser treated layer, (d) cracks in PEO laser, (e) fine cellular structure in laser treated layer, and (f) fine columnar structure in laser treated layer

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Fig. 4

X-ray diffractogram for the laser treated PEO and PEO surfaces. AlNO has the composition of Al2.85O3.45N0.56.

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Fig. 5

Scratch tests results for laser treated PEO surface and PEO surface. (a) Laser treated surface and (b) PEO treated surface.

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Fig. 6

(a) Scar depth for laser treated PEO and untreated PEO surfaces and (b) wear tracks resulted during the starch tests: (i) laser-treated PEO surface and (ii) PEO surface

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Fig. 7

Micrographs and photographs representing the hydrophobic state of the PEO and laser-treated PEO surfaces

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