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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Page 93 of 128

35 MATERIALS PERFORMANCE: VOL. 57, NO. 9 SEPTEMBER 2018 n NEW Faster measurement speed— 60+ readings per minute n N o calibrat ion adjustment required for most applicat ions – measure right out of the box! n Tough probes, robust housing and strong two year warranty n All models include Certificate of Calibration n Includes PosiSoft suite of software f or viewing and reporting dat a Co at in g Th ic k n e ss Gage s Simple. Durable. Accurate. DeFelsko Corporation l Ogdensburg, New York USA Tel: +1-315-393-4450 l Email: Award Winning Compatibility! The PosiTector gage accepts ALL coating thickness, surface profile, environmental, soluble salt, Shore hardness and ultrasonic wall thickness probes. 1 -8 0 0 -4 4 8-3835 www. d ef el sko. com Scan Modes Advanced models now include 3 Powerful Scan Modes NEW! exposed to temperature stability, and ther- mal cycling and hot saline-water immersion properties. e coating's properties should be present upon application without stov- ing or curing at elevated temperatures. If a coating requires heat curing, specification and use of that coating in conditions below its cure temperature should be avoided as CUI protection will be limited. Polysiloxane is an inorganic polymer with superior properties that include tem- perature tolerance and ultraviolet (UV) resistance. Reynolds and Bock comment that polysiloxane polymers have demon- strated particular characteristics that enable them to withstand the harsh condi- tions that can lead to CUI, including hot water immersion, high temperatures, and chemical and UV exposure. e polysilox- ane polymer's silicon/oxygen bonding mechanism is very resistant to heat and UV degradation due to its higher bond dissociation energy (452 kJ/mol) and oxi- dized state. e traditional carbon/carbon bonding of organic-based polymers has lower bond dissociation energy (346 kJ/ mol) and the potential to oxidize further, making the organic polymers more suscep- tible to degradation. When heat and UV resistance (either individually or combined) are required, polysiloxane chemistry dem- Continued on page 36 onstrates a greater degree of suitability over organic-based polymers. In their presentation, Reynolds and Bock note that a first-generation polysilox- ane coating, comprised of an epoxy-silox- ane hybrid that cures in ambient tempera- tures, was introduced in the mid-1990s. It was developed for use as an elevated- temperature coating, either exposed or under insulation, and is usable on substrate

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