Corrosion performance of duplex and austenitic stainless steels in simulated SO{sub 2} absorber environments
- CC Technologies, Dublin, OH (United States)
- Nickel Development Inst., Toronto, Ontario (Canada)
The new generation of FGD systems are planned to operate in a near closed-loop mode to minimize waste discharge in order to meet the 1990 US Clean Air Act Amendments. Because of this closed-loop operation, the chloride concentration in the SO{sub 2} absorbers could build up as high as 100,000 ppm. Some duplex and 4--6% Mo containing stainless steels are candidate materials of construction for these absorbers. The corrosion behavior of some candidate alloys (Alloy 2205, Type 317LMN and 6% Mo stainless steels) has been investigated in simulated SO{sub 2} absorber environments. In addition to these alloys, Type 316L stainless steel and the nickel-base alloy C-276 were tested as reference alloys. Both welded and unwelded coupons of the alloys were exposed to calcium chloride brines having chloride concentrations of 10,000, 20,000, 30,000, 50,000, and 100,000 ppm at temperatures of 55 and 80 C. Alloy C-276 experienced only very light uniform attack with corrosion rates of less than 1.0 mpy. All the other alloys experienced significant corrosion attack under the scale deposits, some pitting of the base metal, and considerable localized attack in the heat affected zones adjacent to the welds. The overall performance of the alloys in the order of decreasing corrosion resistance was as follows: Alloy C-276 > 6% Mo stainless steel > Alloy 2205 > Type 317LMN > Type 316L. The temperature was a more significant variable in promoting corrosion of the alloys than was chloride concentration in the range investigated.
- OSTI ID:
- 272001
- Report Number(s):
- CONF-960389-; TRN: IM9635%%428
- 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
01 COAL, LIGNITE, AND PEAT
POLLUTION CONTROL EQUIPMENT
CORROSION RESISTANT ALLOYS
STAINLESS STEEL-316L
CORROSION RESISTANCE
STAINLESS STEEL-317
NICKEL BASE ALLOYS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
FLUE GAS
DESULFURIZATION
SULFUR DIOXIDE
CORROSIVE EFFECTS
CALCIUM CHLORIDES
PITTING CORROSION
TEMPERATURE DEPENDENCE
METALLOGRAPHY
WEIGHT
LOSSES
WELDED JOINTS
EXPERIMENTAL DATA