In this study, superhydrophobic surfaces were fabricated using 1H,1H,2H,2H-perfluorooctyltriethoxysilane monolayer deposition on thermally oxidized brass. The superhydrophobic surface showed a contact angle (CA) of 155° with a CA hysteresis of 3.5°. The corrosion behaviour of developed superhydrophobic surface was evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies in 3.5\% NaCl solution. The superhydrophobic surface showed exceptional corrosion behaviour with nearly 21 times higher corrosion resistance compared to as-received (AS) brass. The EIS analysis suggests the presence of Warburg impedance in the AS brass indicating diffusion phenomena, while superhydrophobic brass surface showed a reversed loop in the low-frequency spectra, signifying significantly delayed kinetics of the electrochemical system. The study provides a facile, promising means of developing highly corrosion-resistant surfaces in engineering materials. © 2020, © 2020 Institute of Materials, Minerals and Mining Published by Taylor & Francis on behalf of the Institute.

Harpreet Singh Grewal

Mechanical Engineering

(SoE) School of Engineering

Harpreet Singh

Dominic J.

Perumal G.

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Shiv Nadar University

Facile fabrication of superhydrophobic brass surface for excellent corrosion resistance

Surface Engineering

Superhydrophobic surfaces with high adhesion have attracted huge attention in recent research works due to their versatile applications including transportation of microdroplet without any loss. Modification of metallic surfaces to achieve such properties is important to extend their applications. Especially, the superhydrophobic surfaces with very low bacterial adhesion have attracted intense attention in medical, food, and pharmaceutical industries. Here, we have fabricated different micropatterns on aluminium surfaces using a simple and cost-effective micro-imprinting technique. The surface chemistry was modified through a coating of low surface energy material 1H, 1H, 2H, 2H-perfluorooctyl-trichlorosilane (FOTS) using vapor deposition technique. Surface morphology of the samples was investigated using scanning electron microscopy (SEM) and contact profilometer. Results show a significant influence of the surface morphology on the wetting, adhesion and anti-bacterial properties. Surfaces composed of discrete micropillars showed higher de-wetting compared to surface containing continuous zig-zag micro lines even despite lower roughness factor. However, the opposite trend was observed in case of adhesion. These results are explained based on wetting state and difference in liquid-air interface pinning. Further, the developed samples showed higher water-retaining ability compared to rose-petal along with superhydrophobicity. The surface with micropillar structures with higher roughness factor exhibited improved non-fouling behavior which has been quantified by spot assay and atomic force microscopy (AFM). This study opens up the possibility of fabricating multifunctional metal surfaces on a large scale by a cost-effective, environment friendly and easily scalable processing route. © 2020 IOP Publishing Ltd.

Surface Topography: Metrology and Properties

Effect of topography and chemical treatment on the hydrophobicity and antibacterial activities of micropatterned aluminium surfaces

Advanced Materials Interfaces

Superamphiphobic Surfaces with Controllable Adhesion Fabricated by Femtosecond Laser Bessel Beam on PTFE

Corrosion and fouling behaviours of copper-based superhydrophobic coating

Preparation of corrosion-resisting superhydrophobic surface on aluminium substrate

Electrochemistry Communications

Negative capacitance or inductive loop? – A general assessment of a common low frequency impedance feature

Annals of Clinical Microbiology

Inhibitory Effect of Metal Surface on the Antimicrobial Resistance Microorganism