Gateman, SM;
Page, K;
Halimi, I;
Nascimento, ARC;
Savoie, S;
Schulz, R;
Moreau, C;
... Mauzeroll, J; + view all
(2020)
Corrosion of One-Step Superhydrophobic Stainless-Steel Thermal Spray Coatings.
ACS Applied Materials and Interfaces
, 12
(1)
pp. 1523-1532.
10.1021/acsami.9b17836.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Corrosion of One-Step Superhydrophobic Stainless-Steel Thermal Spray Coatings |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acsami.9b17836 |
| Publisher version: | http://dx.doi.org/10.1021/acsami.9b17836 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | high-velocity oxygen fuel, thermal spray, coatings, stainless steel, superhydrophobicity, surface chemistry, corrosion |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10090631 |
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