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96170 EROSION-CORROSION OF COOLED THERMAL SPRAYED COATINGS IMPACTED BY MIXTURES OF QUARTZ AND CHEMICALLY ACTIVE COMPOUNDS

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Product Number: 51300-96170-SG
ISBN: 96170 1996 CP
Author: Buqian Wang and Kevin Luer
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A series of erosion-corrosion tests was carried out on AISI 1018 steel and four thermal sprayed coatings using a nozzle type elevated temperature erosion tester. The erodent particles were mechanical mixtures of SiO2 (quartz) with 1-4% NaCl or I -4% KCl. The specimens were water-cooled on the backside. Test conditions attempted to simulate erosioncorrosion (E-C) conditions at the tubes in the convection pass of FBC boilers. The effect of Cl-bearing salt/quartz mixtures on the E-C wastage mechanisms of these materials were investigated. It was found that the E-C wastage of 1018 steel and carbide coating specimens increased with increasing amounts of NaCl and KCl doped in the quartz. Among the four coatings tested, a WC- I 7CoCr coating demonstrated the lowest thickness loss of all of the quartz/salt mixtures while the Cr3C2- 25NiCr coating exhibited the highest E-C wastage. Meanwhile, quartz doped with NaCl or KCl had no effect on the E-C wastage of an HVOF Ni20Cr15Mo metal coating. The accelerating effect of doping alkali chlorides increased with both specimen surface temperature and environmental temperature. Keywords: quartz, SiO2, NaCl, KCl, HVOF coatings, erosion-corrosion, chemically active compounds, fluidized bed combustors, material wastage, elevated temperatures, wastage mechanisms.
A series of erosion-corrosion tests was carried out on AISI 1018 steel and four thermal sprayed coatings using a nozzle type elevated temperature erosion tester. The erodent particles were mechanical mixtures of SiO2 (quartz) with 1-4% NaCl or I -4% KCl. The specimens were water-cooled on the backside. Test conditions attempted to simulate erosioncorrosion (E-C) conditions at the tubes in the convection pass of FBC boilers. The effect of Cl-bearing salt/quartz mixtures on the E-C wastage mechanisms of these materials were investigated. It was found that the E-C wastage of 1018 steel and carbide coating specimens increased with increasing amounts of NaCl and KCl doped in the quartz. Among the four coatings tested, a WC- I 7CoCr coating demonstrated the lowest thickness loss of all of the quartz/salt mixtures while the Cr3C2- 25NiCr coating exhibited the highest E-C wastage. Meanwhile, quartz doped with NaCl or KCl had no effect on the E-C wastage of an HVOF Ni20Cr15Mo metal coating. The accelerating effect of doping alkali chlorides increased with both specimen surface temperature and environmental temperature. Keywords: quartz, SiO2, NaCl, KCl, HVOF coatings, erosion-corrosion, chemically active compounds, fluidized bed combustors, material wastage, elevated temperatures, wastage mechanisms.
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