Erosion-corrosion of cooled thermal sprayed coatings impacted by mixtures of quartz and chemically active compounds

Conference · Thu Aug 01 04:00:00 EDT 1996

OSTI ID:268221

Wang, B; Luer, K ^[1]

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1. Metalspray USA, Inc., Richmond, VA (United States)

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 SiO{sub 2} (quartz) with 1--4% NaCl or 1--4% KCl. The specimens were water-cooled on the backside. Test conditions attempted to simulate erosion-corrosion (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-17CoCr coating demonstrated the lowest thickness loss of all of the quartz/salt mixtures while the Cr{sub 3}C{sub 2}-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.

• OSTI ID: 268221
• Report Number(s): CONF-960389--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
CARBON STEELS
CHROMIUM ALLOYS
CHROMIUM CARBIDES
COBALT ALLOYS
CORROSION
CORROSION RESISTANCE
EROSION
FLUIDIZED BED BOILERS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
PROTECTIVE COATINGS
TUBES
TUNGSTEN CARBIDES
WEAR RESISTANCE