Materials Performance

SEP 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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37 MATERIALS PERFORMANCE: VOL. 57, NO. 9 SEPTEMBER 2018 equipment such as pipe, ductwork, or tanks to within safe-to-touch limits ( for person- nel protection), maintain temperatures in storage units, and provide thermal insula- tion properties. In some cases, the coatings have either partly or completely replaced traditional insulation cladding systems and wire cages for both hot and cold processing temperatures. If any corrosion is occurring, it is visible and easily rectified during a maintenance program. e TIC technolo- gies can be applied at ambient or elevated temperatures for in-service applications and adhere to a range of anticorrosion primers, which results in a high-perfor- mance coating system that provides both corrosion-resistance and insulation properties. Until recently, TICs were formulated from predominately organic-based poly- mers (acrylics or epoxies) and filled with ceramic/glass microspheres or silica- based insulation media, which influence the resulting low thermal conductivities of TICs. Two major drawbacks with the organic-based TICs include relatively low film-build capabilities—between 20 to 40 mils (508 to 1,016 μm)—which may require up to 10 or more coats to achieve to the required thickness for providing insulation properties. Also, the organic-based poly- mers limit the coatings' temperature resistance range to –40 to 356 °F (–40 to 180 °C). According to Reynolds and Bock, fur- ther research and development of the poly- siloxane matrix resulted in a water-based (low VOC), single-component, ambient- cure, third-generation polysiloxane TIC technology. ese coatings are designed for ultra-high-build dry film thicknesses that can exceed 800 mils (20 mm) and a temper- ature tolerance range from –76 to 752 °F (–60 to 400 °C). Additionally, the polysilox- ane polymer facilitates high weathering resistance and thermal cycling properties in ultra-high film thicknesses >800 mils—film thickness capabilities needed for efficient thermal insulation and personnel protection. With these new developments in polysi- loxane coatings for both anticorrosion and insulation applications, Reynolds and Bock conclude that assets can be protected with thermal insulation and corrosion control via a two-coat system—a third-generation polysiloxane TIC applied over a third-gener- ation polysiloxane CUI primer. is system enables a coating system to replace tradi- tional coating/insulation systems that are prone to CUI. By using a coating system that doesn't need a protective cladding, asset owners can visually assess equipment during inspection programs, which elimi- nates the hidden corrosion threat of CUI. More information on polysiloxane coat- ings and CUI can be found in CORROSION 2018 paper no. 11415, "ird Generation Polysiloxane Coatings for CUI Mitigation," by J. Reynolds and P. Bock. Continued on page 38 DeFelsko Corporation l Ogdensburg, New York USA Tel: +1-315-393-4450 l Email: techsale@defelsko.com Measures the concentration of soluble salts on metal surfaces using the Bresle method n Displays test duration, sample t emperat ure, conductivity (µs/cm) and surface density n Easy 1-2-3 gage interface guides users through the Bresle method n Includes PosiSoft suite of software for viewing and reporting data NEW 1 -800-448-3835 www.defelsko.com Innovative PosiPatch TM n No adhesive residue n No sharps, no needles! For use with all B resle pat ch t ypes including t he innovat ive PosiPat ch

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