Fireside corrosion of alloys for USC plants.
Conference
·
OSTI ID:971128
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.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- FE
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 971128
- Report Number(s):
- ANL/NE/CP-119395
- Country of Publication:
- United States
- Language:
- ENGLISH
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