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Title: Fireside corrosion of alloys for USC plants.

Abstract

A program on fireside corrosion, in support of ultrasupercritical (USC) plants, is being conducted at Argonne National Laboratory to evaluate the performance of several structural alloys in the presence of mixtures of synthetic coal ash, alkali sulfates, and alkali chlorides. Experiments in the present program address the effects of deposit chemistry, temperature, and alloy chemistry on the corrosion response of alloys at temperatures in the range of 650-800 C. Fe-base materials selected for the study included intermediate-Cr ferritic and high-Cr austenitic alloys. Ni-base alloys selected for the study included 600, 601, 617, 690, 625, 602CA, 214, 230, 45TM, HR160, 740, and 693. Data were obtained on weight change, scale thickness, internal penetration, microstructural characteristics of corrosion products, mechanical integrity of the scales, and cracking of scales. The intermediate-Cr ferritic steels exhibited catastrophic corrosion at 650 C in the presence of 150-300 vppm NaCl in the exposure environment. Based on acquired corrosion information, we have proposed a mechanism for accelerated corrosion in the presence of a NaCl-containing oxidizing environment. We have modified the chemical composition of the surface of these alloys to improve their corrosion resistance in the fireside environment. The surface-modified alloys showed substantial resistance to corrosion after 200-h exposures.more » Additional tests are in progress to evaluate the long-term performance and the effect, if any, of the combination of ash and NaCl in the corrosion resistance of intermediate-Cr steels. Experiments are also underway to evaluate austenitic Fe- and Ni-base alloys in similar environments.« less

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
FE
OSTI Identifier:
971128
Report Number(s):
ANL/NE/CP-119395
TRN: US201003%%580
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 20th Annual Conference on Fossil Energy Materials; Jun. 12, 2006 - Jun. 14, 2006; Knoxville, TN
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; 01 COAL, LIGNITE, AND PEAT; ALLOYS; ANL; CHEMICAL COMPOSITION; CHEMISTRY; CHLORIDES; COAL; CORROSION; CORROSION PRODUCTS; CORROSION RESISTANCE; FERRITIC STEELS; MIXTURES; PERFORMANCE; STEELS; SULFATES; THICKNESS

Citation Formats

Natesan, K., Park, J. H., and Nuclear Engineering Division. Fireside corrosion of alloys for USC plants.. United States: N. p., 2007. Web.
Natesan, K., Park, J. H., & Nuclear Engineering Division. Fireside corrosion of alloys for USC plants.. United States.
Natesan, K., Park, J. H., and Nuclear Engineering Division. Mon . "Fireside corrosion of alloys for USC plants.". United States. doi:.
@article{osti_971128,
title = {Fireside corrosion of alloys for USC plants.},
author = {Natesan, K. and Park, J. H. and Nuclear Engineering Division},
abstractNote = {A program on fireside corrosion, in support of ultrasupercritical (USC) plants, is being conducted at Argonne National Laboratory to evaluate the performance of several structural alloys in the presence of mixtures of synthetic coal ash, alkali sulfates, and alkali chlorides. Experiments in the present program address the effects of deposit chemistry, temperature, and alloy chemistry on the corrosion response of alloys at temperatures in the range of 650-800 C. Fe-base materials selected for the study included intermediate-Cr ferritic and high-Cr austenitic alloys. Ni-base alloys selected for the study included 600, 601, 617, 690, 625, 602CA, 214, 230, 45TM, HR160, 740, and 693. Data were obtained on weight change, scale thickness, internal penetration, microstructural characteristics of corrosion products, mechanical integrity of the scales, and cracking of scales. The intermediate-Cr ferritic steels exhibited catastrophic corrosion at 650 C in the presence of 150-300 vppm NaCl in the exposure environment. Based on acquired corrosion information, we have proposed a mechanism for accelerated corrosion in the presence of a NaCl-containing oxidizing environment. We have modified the chemical composition of the surface of these alloys to improve their corrosion resistance in the fireside environment. The surface-modified alloys showed substantial resistance to corrosion after 200-h exposures. Additional tests are in progress to evaluate the long-term performance and the effect, if any, of the combination of ash and NaCl in the corrosion resistance of intermediate-Cr steels. Experiments are also underway to evaluate austenitic Fe- and Ni-base alloys in similar environments.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

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  • No abstract prepared.
  • Oxy-Fuel Fireside Research goals are: (1) Determine the effect of oxy-fuel combustion on fireside corrosion - (a) Flue gas recycle choice, Staged combustion ramifications, (c) JCOAL Collaboration; and (2) Develop methods to use chromia solubility in ash as an 'ash corrosivity' measurement - (a) Synthetic ashes at first, then boiler and burner rig ashes, (b) Applicable to SH/RH conditions.
  • A program on fireside corrosion is being conducted at Argonne National Laboratory to evaluate the performance of several structural alloys in the presence of mixtures of synthetic coal ash, alkali sulfates, and alkali chlorides. Candidate alloys are also exposed in a small-scale coal-fired combustor at the National Energy Technology Laboratory in Pittsburgh. Experiments in the present program, which addresses the effects of deposit chemistry, temperature, and alloy chemistry on the corrosion response of alloys, were conducted at temperatures in the range of 575-800 C for time periods up to {approx}1850 h. Alloys selected for the study included HR3C, 310TaN, HR120,more » SAVE 25, NF709, modified 800, 347HFG, and HCM12A. In addition, 800H clad with Alloy 671 was included in several of the exposures. Data were obtained on weight change, scale thickness, internal penetration, microstructural characteristics of corrosion products, mechanical integrity, and cracking of scales. Results showed that relationship of corrosion rates to temperature followed a bell-shaped curve, with peak rates at {approx}725 C, but the rate itself was dependent on the alloy chemistry. Several alloys showed acceptable rates in the sulfate-containing coal-ash environment; but NaCl in the deposit led to catastrophic corrosion at 650 and 800 C.« less
  • Experimental and recently developed alloys, claddings, and coating have been evaluated for use in the superheater region of pulverized-coal-fired boilers. Six series of tests were conducted to determine the effects of gas composition, ash composition, exposure temperature, length of exposure, and the effect that disturbance of the ash layer had on the wastage rates of the alloys. Long-term in-situ testing with air-cooled, retractable corrosion probes is being finalized.