%0 Journal Article
%A Gateman, SM
%A Page, K
%A Halimi, I
%A Nascimento, ARC
%A Savoie, S
%A Schulz, R
%A Moreau, C
%A Parkin, IP
%A Mauzeroll, J
%D 2020
%F discovery:10090631
%J ACS Applied Materials and Interfaces
%K high-velocity oxygen fuel, thermal spray, coatings, stainless steel, superhydrophobicity, surface chemistry, corrosion
%N 1
%P 1523-1532
%T Corrosion of One-Step Superhydrophobic Stainless-Steel Thermal Spray Coatings
%U https://discovery.ucl.ac.uk/id/eprint/10090631/
%V 12
%X As most superhydrophobic coatings are made of soft materials, the need for harder, more robust films is evident in applications where erosional degradation is of concern. The work herein describes a methodology to produce superhydrophobic stainless-steel thermal spray coatings using the high-velocity oxygen fuel technique. Due to the use of a kerosene fuel source, a carbon-rich film is formed on the surface of the thermal spray coatings, lowering the surface energy of the high-energy metallic substrates. The thermal spray process generates a hierarchical micro-/sub-micro-structure that is needed to sustain superhydrophobicity. The effect of spray parameters such as particle velocity and temperature on the coating’s hydrophobicity state was explored, and a high particle velocity was shown to cause superhydrophobic characteristics. The coatings were characterized using scanning electron microscopy, profilometry, X-ray photoelectron spectroscopy, static water contact angle measurements, water droplet roll-off measurements, and water droplet bouncing tests. The corrosion behavior of the coatings was studied using potentiodynamic polarization measurements in order to correlate water repellency with corrosion resistance; however, all coatings demonstrated active corrosion without passivation. This study describes an interesting phenomenon where superhydrophobicity does not guarantee corrosion resistance and discusses alternative applications for such materials.
%Z This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.