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

Author

Watkins, Evan, Griffiths, Chris M., Richards, Calvin A. J., Potts, Sarah-Jane, Batchelor, Chris, Barker, Peter, Searle, Justin, and Jewell, Eifion

Subjects
CORROSION resistance, STEEL, STEEL corrosion, SURFACE coatings, EPOXY coatings, ETHYL silicate
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. [ABSTRACT FROM AUTHOR]

Published
2024
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11. The effect of graphite and carbon black ratios on conductive ink performance

Author

Phillips, Chris, Al-Ahmadi, Awadh, Potts, Sarah-Jane, Claypole, Tim, and Deganello, Davide

Subjects
Materials science, Mechanical Engineering, chemistry.chemical_element, 02 engineering and technology, Carbon black, Conductivity, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 7. Clean energy, 0104 chemical sciences, chemistry, Mechanics of Materials, Screen printing, Conductive ink, Surface roughness, General Materials Science, Graphite, Composite material, 0210 nano-technology, Electrical conductor, Carbon, Composites
Abstract

Conductive inks based on graphite and carbon black are used in a host of applications including energy storage, energy harvesting, electrochemical sensors and printed heaters. This requires accurate control of electrical properties tailored to the application; ink formulation is a fundamental element of this. Data on how formulation relates to properties have tended to apply to only single types of conductor at any time, with data on mixed types of carbon only empirical thus far. Therefore, screen printable carbon inks with differing graphite, carbon black and vinyl polymer content were formulated and printed to establish the effect on rheology, deposition and conductivity. The study found that at a higher total carbon loading ink of 29.4% by mass, optimal conductivity (0.029 Ω cm) was achieved at a graphite to carbon black ratio of 2.6 to 1. For a lower total carbon loading (21.7 mass %), this ratio was reduced to 1.8 to 1. Formulation affected viscosity and hence ink transfer and also surface roughness due to retention of features from the screen printing mesh and the inherent roughness of the carbon components, as well as the ability of features to be reproduced consistently.

Published
2017

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