Evaluation of the anti-fouling properties of nm thick atmospheric plasma deposited coatings

Both organic and inorganic fouling are significant problems for stainless steel surfaces used in industrial applications as diverse as shipping and paper making. The objective of this study is to evaluate the anti-fouling properties of a range of fluoropolymer, fluorinated and non-fluorinated siloxa...

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Bibliographic Details
Published in:Surface & coatings technology 2010-11, Vol.205 (5), p.1544-1551
Main Authors: Dowling, Denis P., Nwankire, Charles E., Riihimäki, Markus, Keiski, Riitta, Nylén, Ulf
Format: Article
Language:English
Subjects:
Anti-fouling
Atmospheric plasma coatings
Atmospherics
Calcium carbonate
Coatings
Cross-disciplinary physics: materials science
rheology
Crystallization fouling
Discs
Disks
Exact sciences and technology
Fouling
Heat exchangers
Materials science
Oil fouling
Particulate fouling
Physics
Siloxane
Stainless steels
Steels
Surface treatments
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Summary:Both organic and inorganic fouling are significant problems for stainless steel surfaces used in industrial applications as diverse as shipping and paper making. The objective of this study is to evaluate the anti-fouling properties of a range of fluoropolymer, fluorinated and non-fluorinated siloxane coatings on stainless steel substrates. These nm thick coatings were deposited using the atmospheric plasma jet system called PlasmaStream™. The surface properties of the plasma polymerised coatings were examined using optical profilometry, SEM–EDX, ellipsometry, contact angle measurement and FTIR. Accelerated wear testing of the coated heat exchangers indicated that coating durability was a significant issue for the nanometre thick coatings investigated. A crystallization fouling study was carried out using a laboratory scale heat exchanger test apparatus. In this the heated steel surface was in contact with flowing fluid containing CaCO 3 particles. The coated steel exhibited both a delay before fouling was initiated and in addition a decrease in the fouling rate. A lubricant oil fouling study was also carried out involving a comparison between both coated and uncoated stainless steel separator discs over a 30 day period, in the engine of a passenger ferry. A significant reduction in the level of oil fouling was observed for the fluorosiloxane and fluoropolymer coated separator discs compared with the uncoated discs.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2010.10.010