Performance of Fe-Si coatings under vanadic attack
- Inst. de Investigaciones Electricas, Cuernavaca (Mexico). Dept. Fisico-Quimica Aplicada
- U.A. de Campeche, Cuernavaca (Mexico). Programa de Corrosion del Golfo de Mexico
The effect of the silicon content on the high temperature corrosion resistance of Fe-Si coatings applied by the thermal spray technique was studied. The coatings were applied using a double-layer system. The first layer was a Ni20Cr coating and the second was composed by the different Fe-Si coatings. The corrosion tests were carried out in a 80%V{sub 2}O{sub 5}-20%Na{sub 2}SO{sub 4} corrosive mixture, for 500 hours at temperatures from 600 to 1,000 C. The performance of each of the coatings varied as a function of the chemical composition, the physical characteristic and the temperature. Increasing the silicon content enhanced the corrosion resistance of the coating. Furthermore, the exposure of the coating to the high temperature testing induced the densification by self-healing of the initial porosity of the coating. Even though the Si-based coatings significantly enhanced the corrosion resistance, sulfidation was observed. In the Ni20Cr coating and metal base the severity of this attack was also a function of the composition of the coating and the temperature of the test.
- OSTI ID:
- 397809
- Report Number(s):
- CONF-960389-; TRN: IM9649%%17
- Resource Relation:
- Conference: National Association of Corrosion Engineers (NACE) annual corrosion conference and exposition: water and waste water industries, Denver, CO (United States), 24-29 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Corrosion/96 conference papers; PB: [6615] p.
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
02 PETROLEUM
IRON ALLOYS
FLAME SPRAYING
CORROSION RESISTANCE
SILICON ALLOYS
NICKEL ALLOYS
CHROMIUM ALLOYS
BOILERS
MATERIALS
FUEL OILS
COMBUSTION
STAINLESS STEEL-304
POWDERS
CHEMICAL COMPOSITION
X-RAY DIFFRACTION
VANADIUM OXIDES
SODIUM SULFATES
TEMPERATURE DEPENDENCE
WEIGHT MEASUREMENT
SCANNING ELECTRON MICROSCOPY
EXPERIMENTAL DATA