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http://dx.doi.org/10.3365/KJMM.2010.48.04.277

Hot Corrosion Properties of Heat Resistant Chrome Steels  

Lee, Han-sang (Power Generation Laboratory, Korea Electric Power Research Institute)
Jung, Jine-sung (Power Generation Laboratory, Korea Electric Power Research Institute)
Yoo, Keun-bong (Power Generation Laboratory, Korea Electric Power Research Institute)
Kim, Eui-hyun (Power Generation Laboratory, Korea Electric Power Research Institute)
Publication Information
Korean Journal of Metals and Materials / v.48, no.4, 2010 , pp. 277-288 More about this Journal
Abstract
The hot corrosion properties of heat-resistant steels were investigated in an oxidation atmosphere including artificial ash and sulfur dioxide. The heat-resistant steels of T22, T92, T122, T347HFG, Super304H and HR3C were evaluated at 620, 670 and $720^{\circ}C$ for 400 hours. The relationship between the corrosion rate and the temperature followed a bell-shaped curve with a peak rate at around $670^{\circ}C$. The corrosion rates showed a decreasing tendency as the chrome contents of these steels increased from 2.15 wt.% to 24.5 wt.%, and austenitic steels had a lower corrosion rate than ferritic steels. Sulfidation by $SO_2$ as well as molten salt corrosion also had an effect on the total corrosion rate, especially showing an increase in the corrosion rate in ferritic steels. Regardless of the chrome content in the steels and irrespective of the test temperature, the corrosion scale was composed of an outer oxide and an artificial ash mixed layer, a middle oxide layer and inner sulfide, and a mixed oxide layer. As the chrome content increased, the proportion of chrome oxide in the corrosion scale increased. Before spalling of the corrosion scale, voids and cracks were initiated in the sulfide and the mixed oxide layer or at the interface with the substrate.
Keywords
oxides; aging; corrosion; scanning electron microscopy (SEM); X-ray diffraction;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By SCOPUS : 6
연도 인용수 순위
1 R. B. Dooley and W. P. McNaughton, Boiler Tube Failures, EPRI Report TR-105261 (1996)
2 I. M. Rehn, Fireside corrosion of superheater alloys, EPRI Report CS-5195 (1987)
3 K. Natesan and J. H. Park, Int. J. Hydrogen Energy 32, 3689 (2007)   DOI   ScienceOn
4 Material Selection and Corrosion Correlation Development for Superheater/Reheater, p.19, Reaction Eng. Int., Utah (2007).
5 W. T. Reid, External Corrosion and Deposits, Elsevier, New York (1971)
6 A. J. B. Cutler and E. Raask, Cor. Sci. 21, 789 (1981)   DOI   ScienceOn
7 W. T. Reid, External Corrosion and Deposits, Boilers and Gas Turbines, American Elsevier Publishing Company Inc, New York NY (1971)
8 J. Choi and D. Lee, J. Kor. Inst. Met. & Mater. 45, 621 (2007)
9 H. Lee, J. Jung, and E. Kim, J Kor. Inst. Met. & Mater. 47, 99 (2009)
10 M. Homa, Z. Zurek, B. Morgiel, P. Zieba, and J. Wojewoda, Corrosion Science and Technology 7, 139 (2008)
11 I. R. Sohn and T. Narita, Corrosion Science and Technology 31,80 (2002)
12 J. H. Cho, T. W. Kim, K. S. Son, J. H. Yoon, H. S. Kim, G. G. Leisk, D. B. Mitton, and R. M. Latanision, Met. & Mater. Int., 9, 303 (2003)   DOI
13 A. S. Khanna, Introduction to High Temperature Oxidation and Corrosion, p.138, 171, ASM Int. (2002).
14 E. Raask, Mineral Impurities in Coal Combustion, Hemisphere Publishing, Washington DC p.101 (1985)
15 X. Li and C. Zhou, Corrosion Science and Technology 7, 233 (2008)
16 A. B. Hedley, J. Inst. Fuel 40, 142 (1967)