Effects of Surface Modification Conditions on Hydrophobicity of Silica-based Coating Additives

Conference · Tue Jan 01 00:00:00 EST 2013

OSTI ID:1090485

Armstrong, Beth L ^[1]; Pawel, Steven J ^[1]; Hunter, Scott Robert ^[1]; Haynes, James A ^[1]; Hillesheim, Daniel A ^[1]

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1. ORNL

Superhydrophobic silica (SHS) powders are being evaluated as a potential additive to the polyurethane topcoats used in Chemical Agent Resistant Coating (CARC) systems, with the goal of improving water repellency and corrosion protection characteristics. The current generation of CARC topcoats is already highly loaded with solids, and thus there is a premium on minimization of the total SHS powder required to achieve the desired properties. Therefore, efficient surface modification of the silica and proper dispersion in the coating will be required. The effect of a dispersant on the surface modification of silica particles by chlorosilanes was addressed in this study. The properties of various SHS powders were characterized by thermogravimetric analysis and mass spectroscopy. Correlations between powder modification conditions and the ultimate effects of the modified particles on hydrophobicity of CARC topcoats were assessed. The use of contact and rolling angle measurements along with scanning electron microscopy are discussed as they pertain to the ability to quantify the effects of modified silicas on corrosion prevention coatings. Furthermore, a systematic approach to modifying and testing both powders and top coats of corrosion prevention systems is presented.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: Work for Others (WFO)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1090485
• Resource Relation: Conference: NACE Spring 2013, Orlando, FL, USA, 20130317, 20130321
• Country of Publication: United States
• Language: English