Materials Performance

NOV 2014

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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43 NACE INTERNATIONAL: VOL. 53, NO. 11 MATERIALS PERFORMANCE NOVEMBER 2014 Continued on page 44 BLOG Continued from The MP Blog, p. 13. The following items relate to coatings & linings. Please be advised that the items are not peer-reviewed, and opinions and suggestions are entirely those of the in- quirers and respondents. NACE Interna- tional does not guarantee the accuracy of the technical solutions discussed. MP welcomes additional responses to these items. They may be edited for clarity. Environmentally friendly coating selection Q: We are often given the task of recommending protective coatings for various applications for process plants. The choices usually are fusion-bonded epoxy (FBE), powdered coatings through f luidized beds, or electroplating. From the environmental point of view, which coating process is appropriate? A: I recommend that you include 100% solids, liquid-applied coatings. Situations will exist that make powder-applied coatings impractical. Versatility and portability are two impor- tant benefts of liquid-applied coatings. Tis is not to say liquid-applied coatings are better than FBE, powder coatings, or plating—it's just another solution where appropriate. Polysiloxane coatings at high temperatures Q: Does anybody have experience (good or bad) with the applica- tion and/or service performance of polysiloxane paints at temperatures ~500 °C? A: You may have an inaccurate impression that polysiloxane coatings are designed for high-tempera- ture service. Te entire group of poly - siloxane hybrid coatings is organic by design, and temperature-limited by thermal decomposition. A lthough some organic resins (epoxy, acrylic, etc.) used in polysiloxane may be slightly more temperature-resistant, by 250 °C every- thing organic has evaporated or burned. If you need performance at 500 °C, consider straight silicone resin coatings. A: I agree. If you are looking for a solution for high temperature and also chemically resistant conditions, you should consider inorganic systems such as potassium silicate, calcium aluminate, and so on. A: I have used polysiloxane coatings on a furnace stack at 800 °F (426 °C) with very good results. Be cau- tious about using them with any thing that cycles.

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