Improving the Corrosion Performance of Organically Coated Steel Using a Sol–Gel Overcoat

Author:

Watkins Evan1ORCID,Griffiths Chris M.1,Richards Calvin A. J.1,Potts Sarah-Jane1ORCID,Batchelor Chris1ORCID,Barker Peter2,Searle Justin1ORCID,Jewell Eifion1ORCID

Affiliation:

1. Faculty of Science and Engineering, Swansea University, Bay Campus, Crymlyn Burrows, Swansea SA1 8EN, UK

2. Tata Steel UK, Shotton Works, Deeside CH5 2NH, UK

Abstract

Organically coated steels are widely used in applications in which they are subjected to the natural environment and therefore require excellent corrosion resistance. Organic clearcoats are typically employed as a barrier that improves the overall corrosion resistance; however, they are typically derived from fossil fuel-based feedstock. A more sustainable alternative could be possible using sol–gel coatings. The application of a simple tetraethoxysilane (TEOS)-based sol–gel was applied to polyurethane-coated steels using a spray coater. The concentration of TEOS was altered to produce coatings containing either 2.5% or 10%. The 10% TEOS resulted in dense, homogeneous coatings that offered a significant improvement in corrosion resistance compared to an uncoated substrate. Whereas the 2.5% TEOS coatings were inhomogeneous and porous, which indicated a limitation of concentration required to produce a uniform coating. The successful demonstration of using a simple TEOS-based coating to improve the corrosion resistance of organically coated steel highlights the potential for further investigation into the use of sol–gels for these applications.

Funder

Engineering and Physical Sciences Research Council

Innovate UK

Welsh Government

Publisher

MDPI AG

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