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Article

Wettability of Metal Surfaces Affected by Paint Layer Covering

1
Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Wita Stwosza 57, 80-308 Gdansk, Poland
2
Department of Physics, Gdynia Maritime University, Morska 81-87, 81-225 Gdynia, Poland
3
MGE, Lipowa 7, 82-103 Stegna, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Sara Bagherifard
Materials 2022, 15(5), 1830; https://doi.org/10.3390/ma15051830
Received: 7 February 2022 / Revised: 22 February 2022 / Accepted: 24 February 2022 / Published: 28 February 2022
The aim of the work was to quantify the surface wettability of metallic (Fe, Al, Cu, brass) surfaces covered with sprayed paints. Wettability was determined using the contact angle hysteresis approach, where dynamic contact angles (advancing ΘA and receding ΘR) were identified with the inclined plate method. The equilibrium, ΘY, contact angle hysteresis, CAH = ΘA − ΘR, film pressure, Π, surface free energy, γSV, works of adhesion, WA, and spreading, WS, were considered. Hydrophobic water/solid interactions were exhibited for the treated surfaces with the dispersive term contribution to γSV equal to (0.66–0.69). The registered 3D surface roughness profiles allowed the surface roughness and surface heterogeneity effect on wettability to be discussed. The clean metallic surfaces turned out to be of a hydrophilic nature (ΘY < 90°) with high γSV, heterogeneous, and rough with a large CAH. The surface covering demonstrated the parameters’ evolution, ΘA↑, ΘR↑, γSV↓, WA↓, and WS↓, corresponding to the surface hydrophobization and exhibiting base substratum-specific signatures. The dimensionless roughness fluctuation coefficient, η, was linearly correlated to CAH. The CAH methodology based on the three measurable quantities, ΘA, ΘR, and liquid surface tension, γLV, can be a useful tool in surface-mediated process studies, such as lubrication, liquid coating, and thermoflow. View Full-Text
Keywords: metallic substrata; contact angle; wettability models; contact angle hysteresis; surface wettability energetics; paint layer effect metallic substrata; contact angle; wettability models; contact angle hysteresis; surface wettability energetics; paint layer effect
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MDPI and ACS Style

Pogorzelski, S.; Boniewicz-Szmyt, K.; Grzegorczyk, M.; Rochowski, P. Wettability of Metal Surfaces Affected by Paint Layer Covering. Materials 2022, 15, 1830. https://doi.org/10.3390/ma15051830

AMA Style

Pogorzelski S, Boniewicz-Szmyt K, Grzegorczyk M, Rochowski P. Wettability of Metal Surfaces Affected by Paint Layer Covering. Materials. 2022; 15(5):1830. https://doi.org/10.3390/ma15051830

Chicago/Turabian Style

Pogorzelski, Stanislaw, Katarzyna Boniewicz-Szmyt, Maciej Grzegorczyk, and Pawel Rochowski. 2022. "Wettability of Metal Surfaces Affected by Paint Layer Covering" Materials 15, no. 5: 1830. https://doi.org/10.3390/ma15051830

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