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Long-term corrosion protection by a thin nano-composite coating
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Polymer och fiber. KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Chemistry, Division of Surface and Corrosion Science.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
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2015 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 357, no Part B, 2333-2342 p.Article in journal (Refereed) Published
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Abstract [en]

We report and discuss the corrosion protective properties of a thin nano-composite coating system consisting of an 11μm thick polyester acrylate (PEA) basecoat, covered by an approximately 1-2μm thick layer of TiO2 nanoparticles carrying a 0.05μm thick hexamethyl disiloxane (HMDSO) top coat. The corrosion protective properties were evaluated on carbon steel substrates immersed in 3wt% NaCl solution by open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements. The protective properties of each layer, and of each pair of layers, were also evaluated to gain further understanding of the long-term protective properties offered by the nano-composite coating. The full coating system showed excellent corrosion protective properties in the corrosive environment of 3wt% NaCl-solution for an extended period of 100 days, during which the coating impedance, at the lower frequency limit (0.01Hz), remained above 108 Ωcm2. We suggest that the excellent corrosion protective properties of the complete coating system is due to a combination of (i) good adhesion and stability of the PEA basecoat, (ii) the surface roughness and the elongated diffusion path provided by the addition of TiO2 nanoparticles, and (iii) the low surface energy provided by the HMDSO top coat.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 357, no Part B, 2333-2342 p.
Keyword [en]
carbon steel, corrosion, corrosion protection, impedance spectroscopy, liquid flame spray, plasma coating
National Category
Corrosion Engineering Materials Chemistry Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:ri:diva-160DOI: 10.1016/j.apsusc.2015.09.238Scopus ID: 2-s2.0-84957029673OAI: oai:DiVA.org:ri-160DiVA: diva2:939304
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Publication no: A3589

Available from: 2016-06-18 Created: 2016-06-07 Last updated: 2017-11-28Bibliographically approved

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