Materials Performance

JUN 2019

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. 58, NO. 6 JUNE 2019 Continued on page 38 temperatures. Many of those were especially desirable characteristics at this job site, con- sidering the coastal location. "at's a really tough environment for tra- ditional paint to withstand, because effec- tively, you've got salt water, humidity, wind, and significant temperature variations," says Merrick Alpert, president of EonCoat. "With us, rather than lay a traditional tarp over it, you're passivating the steel." e unique features of the technology, though, can require specialized applicator expertise. So before turning Ahn and his crew loose on this or any other job site, some training from the coatings manufacturer was a prerequisite. "We train the applicator, and we're there with the applicator for the first job," Alpert says. "From there, they go out and do it and don't need us. Our business is to manufac- ture the coating and to ship it, and we send out the technical support to train and advise the customer's applicator, who applies the material." "EonCoat is a really sensitive product compared to other conventional coatings," Ahn adds. "It reacts really fast in hot temper- atures, and it's also fast enough with just nor- mal temperatures, too. But it reacts really slowly under cold conditions. It's much faster or slower than an epoxy, for example. In the past, we had trouble since it's either a fast reaction or a slow reaction. ere's plugging of the gun, a wrong mixing ratio caused by a pump problem, no curing under 0 °C (32 °F), and many other problems can occur if you don't pay attention to the details. You need to prepare all the equipment and products very carefully before you start to spray to prevent any trouble. But when you use it correctly, it's a good product with excellent quality." Hopping Crew For the April 2018 assignment, POSCO chose the EonCoat system with an aesthetic topcoat for the four boiler dust-collection "hoppers" at the facility. Due to the system's inorganic properties, chemical resistance, and its ability to withstand temperatures up to 500 °C (932 °F), it is useful in such high-temperature areas, where it can help prevent CUI. "e corrosion inside the dust-collection hopper was severe due to the sulfuric and nitric acid of the line," Ahn says. "e older plates were too thin because of corrosion. Although not all plates were thinned, ran- dom spots with low thickness could cause a collapse." Because POSCO opted to replace the carbon steel plates entirely, a separate 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 temperature, 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 N o sharps, no needles! For use with all Bresle pat ch t ypes including t he innovat ive PosiPat ch

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