On fabrication and corrosion resistance of super-hydrophobic 17-4 ph stainless steel surfaces

Amiriafshar, Mona (2019) On fabrication and corrosion resistance of super-hydrophobic 17-4 ph stainless steel surfaces. Masters thesis, Memorial University of Newfoundland.

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Abstract

Fabrication of surfaces with hydrophobic and super-hydrophobic property has drawn extensive interests as a solution to protect metal surfaces from corrosion attacks, with potential applications in cooling devices for electronics, microfluidic systems for controlled drug delivery, as well as anti-icing, and self-cleaning techniques. This study addresses the impact of surface wettability, i.e., hydrophobicity and super-hydrophobicity, on corrosion resistance improvement of metallic materials. Hydrophobic and super-hydrophobic metal surfaces are desirable to minimize the adhesion between water droplets and the surface. This thesis aims to fabricate and investigate 17-4 PH stainless steel surfaces with lowered surface energies and modified wetting properties. Various micro- and sub-micro scale finished surfaces with different surface roughness, namely as-received, sandblasted, ground, and polished, were employed, followed by applying a low energy super-hydrophobic and Zn electrodeposition coatings on 17-4 PH stainless steel base material to fabricate hydrophobic and super-hydrophobic surfaces, respectively. The specific impacts of the surface roughness on wettability, corrosion resistivity, and coating adhesion of the manufactured surfaces were examined. The coated 17-4 PH stainless steel surfaces were found effective in preventing the aggressive chloride ions from approaching the substrate, leading to the improved corrosion performance of the material. Moreover, the initial surface roughness of the material was found to be a dominating factor in controlling the uniformity and adhesion durability of the coated substrates.

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