Corrosion of high chromium alloys by sulfated slags at elevated temperatures
- Inst. de Investigaciones Electricas, Cuernavaca (Mexico)
- U.A. Campeche, Cuernavaca (Mexico). Programa de Corrosion del Golfo de Mexico
The aim of this paper is to study the corrosion behavior at elevated temperatures of four commercial heat resistant alloys exposed to a slag containing sodium sulfates and vanadates. Laboratory corrosion tests were conducted to obtain information on the performance of the alloys. The UNS specifications of the tested alloys were S44600, N06601, N08330, and ODS MA956. The slag used as corrosive agent was collected from the high temperature zone of an utility oil-fired boiler. Corrosion weight-loss measurements as well as microscopic observations were performed to evaluate resistance of alloys to internal corrosion and sulfidation. The interrelationship between the corrosion behavior of materials and alloy chemistry and temperature are examined. The corrosion mechanisms involved in the degradation of the alloys in the range of 600 C--900 C are discussed. The influence of temperature on alloy degradation is found to be described by a curve with a maximum in the range of 750 C to 805 C. It is illustrated through the characteristics of the corrosion product scales, which have been studied by SEM and x-ray microanalysis. All the alloys exhibited sulfidation at least at the temperature of maximum corrosion rate.
- OSTI ID:
- 397808
- Report Number(s):
- CONF-960389-; TRN: IM9649%%16
- 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
20 FOSSIL-FUELED POWER PLANTS
02 PETROLEUM
IRON ALLOYS
CORROSION
CHROMIUM ALLOYS
NICKEL ALLOYS
ALUMINIUM ALLOYS
MANGANESE ALLOYS
SILICON ALLOYS
FOSSIL-FUEL POWER PLANTS
BOILERS
HEAT EXCHANGERS
FUEL OILS
COMBUSTION
CARBON ADDITIONS
BENCH-SCALE EXPERIMENTS
WEIGHT MEASUREMENT
SULFIDATION
TEMPERATURE DEPENDENCE
SCALING
SCANNING ELECTRON MICROSCOPY
MICROANALYSIS
SODIUM SULFATES
VANADATES
SODIUM COMPOUNDS
EXPERIMENTAL DATA