Laser Surface Texturing on Nickel-Aluminium-Bronze Alloy for Improving the Hydrophobicity
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Laser Surface Texturing on Nickel-Aluminium-Bronze Alloy for Improving the Hydrophobicity V. Ezhilmaran 1
& R.
Damodaram 2
Received: 14 May 2020 / Revised: 7 November 2020 / Accepted: 10 November 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The laser-assisted surface engineering approach to produce hydrophobic surfaces on the metals is exponentially increasing over the last decade. In this study, nanosecond pulsed Nd3+:YAG laser was used to form a linear and non-linear micro-channel textured surface on the surface of Nickel-Aluminium-Bronze metal which is extensively used for marine applications. Contact angle measurement was performed on both non-textured and textured surfaces using a contact angle meter and its hydrophobic behavior was studied. A linear and non-linear textured surface was produced. Initially, the effect of linear micro-channel spacing and re-deposition layer on hydrophobicity was analyzed. Then the inside surface of the linear micro-channel was produced as a periodic surface structure and its influence on hydrophobicity was studied. A non-linear micro-channel containing protruding type structure was also laser textured and its hydrophobic nature was studied. The plain non-textured surface showed a contact angle of 92º. A maximum contact angle of 166º was observed on a non-linear micro-channel containing protruding type pattern. Keywords Surface engineering . Hydrophobicity . Wettability . Texturing . Laser . NickelAluminium-Bronze
Introduction Wettability refers to the tendency of the spreading of the liquid droplet on a solid surface. Wetting properties of surfaces are affected by the micro and nano-scale hierarchical structure as well as the surface chemistry [1–3]. Earlier studies showed that wettability and the resulting surface energies may change the interaction of the solid surfaces with the
* V. Ezhilmaran [email protected]
1
Department of Mechanical Engineering, Mepco Schlenk Engineering College, Sivakasi, India
2
Department of Mechanical Engineering, SSN College of Engineering, Chennai, India
Lasers in Manufacturing and Materials Processing
surrounding liquids [1]. A surface should be hydrophobic to minimize its corrosion behavior [4, 5]. Hydrophilicity is necessary for the surface to improve the tribological behavior such as friction and wear [6, 7]. The surface whether hydrophobic or hydrophilic can be accessed by measuring the contact angle [8]. Hydrophobic surfaces have a contact angle of more than 90˚ whereas hydrophilic surfaces have a contact angle of less than 90˚ [9]. The contact angle of more than 150˚ is termed as super-hydrophobic [9] and the contact angle of less than 5˚ are super-hydrophilic [8]. Wettability studies on different metals such as carbon steels [10], copper [11], aluminium [12], titanium [13], etc. have been already studied by different research groups. Zhiru Yang et al. [1] prepare a micro/nano hierarchical structure i.e. dimple texturing, on the surface of the titanium alloy (Ti-6Al-4V) and developed a
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