Silicon-based thermal-sprayed coatings in utility boiler components

Journal Article · Fri Dec 01 00:00:00 EST 1995 · Materials Performance

OSTI ID:136981

Porcayo-Calderon, J; D`Granda, S ^[1]; Martinez, L ^[2]

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1. Inst. de Investigaciones Electricas, Cuernavaca (Mexico). Dept. Fisico-Quimica Aplicada
2. Univ. Autonoma de Campeche, Cuernavaca (Mexico). Programa de Corrosion del Golfo de Mexico

The performance of thermal-sprayed coatings applied to uncooled components installed in the high-temperature zone of a 300-MW boiler was investigated. The environment in the boiler is highly corrosive because of the burning of heavy fuel oil with high contents of vanadium, sodium, and sulfur. The additive feeder components coated by thermal spraying were exposed to a gas temperature of 1,100 C during approximately 3,240 hours. A nickel-chromium/silicon-iron two-layer based coating demonstrated the best performance. Details of the microstructure in the interfaces between the coating and the corrosive environment and of the coating and the base metal are discussed.

• OSTI ID: 136981
• Journal Information: Materials Performance, Vol. 34, Issue 12; Other Information: DN: Paper presented at Corrosion/95, Orlando, FL (US), March 1995; PBD: Dec 1995
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
02 PETROLEUM
36 MATERIALS SCIENCE
OIL FURNACES
PROTECTIVE COATINGS
CORROSION PROTECTION
MICROSTRUCTURE
RESIDUAL FUELS
CORROSIVE EFFECTS
VISCOSITY
NICKEL ALLOYS
CHROMIUM ALLOYS
SILICON ALLOYS
IRON ALLOYS
SPRAY COATING
STAINLESS STEEL-304
CHEMICAL COMPOSITION
IMAGES