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Abstract Low temperature hot corrosion behavior of Fe-Al alloys was studied in the presence of a thin film of Na_2SO_4-K_2SO_4 deposit on their surfaces in O_2/SO_2/SO_3 gas atmospheres in the temperature range of 650～750℃。 The reaction kinetics were measured gravimetrieally,and the alloys corroded were physically examined and analyzed. The results indicated that the binary sulfate deposit induced more severe hot corrosion of the alloys than a unitary sulfate Na_2SO_4 or K_2SO_4 deposit did. On the basis of a discussion on the effect of the addition of either K_2SO_4 to Na_2SO_4 or Na_2SO_4 to K_2SO_4 on thermodynamics of the equilibrium of mixed salts,the accelerated hot corrosion of the alloys caused by the binary sulfate deposit is attributed to the earlier appearance of a ternary sulfate eutectic, Na_2SO_4-K_2SO_4-Fe_2(SO_4)_3,on the alloy surface.
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Received: 25 June 1992
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Cite this article:
Shi Liangquan; Zhang Yunshu and Shih Shengtai (Shanghai Institute of Metalluargy; Chinese Academy of Sciences). LOW TEMPERATURE HOT CORROSION OF Fe-Al ALLOYS INDUCED BY Na_2SO_4-K_2SO_4 DEPOSIT. J Chin Soc Corr Pro, 1992, 12(3): 196-204.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I3/196
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