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| CORROSION BEHAVIOR OF NICKEL-BASE SUPERALLOYS IN (Na, K)_2 SO_4 MELT |
| Wu Weitao(Institute of Corrosion and Protection of Metal; Academia Sinica) Rahmel; A.; Schorr; M.;(DECHEMA Institut; Frankfurt/Main; West Germany) |
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Abstract The influence of the electrode potential on the corrosion behavior of a series of nickel base superalloys has been studied in a 90(mol.%)Na_2SO_4-10 (mol.%) K_2SO_4 melt at 900 C. Acidic fluxing occurs at positive potentials and basic fluxing at negative potentials. A protective scale is formed in aa intermediate (neutral) potential range on high chromium containing alloys such as IN738LC, IN939, IN597 and IN657. The breakthrough potentials for acidic and basic fluxing are dependent on the composition of the alloys. Alloys with low chromium contents such as IN100 and IN713LC do not form stable protective scale at any potential. Numerous sulfide phases have been identified in the scales and subscales, depending on the potential. the severity of the attack and the materials composition. NaCrS_2 only forms under basic conditions. Its presence can therefore be considered as an indication that basic fluxing conditions have been existent.
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Received: 25 April 1984
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Cite this article:
Wu Weitao(Institute of Corrosion and Protection of Metal; Academia Sinica) Rahmel; A.; Schorr; M.;(DECHEMA Institut; Frankfurt/Main; West Germany). CORROSION BEHAVIOR OF NICKEL-BASE SUPERALLOYS IN (Na, K)_2 SO_4 MELT. J Chin Soc Corr Pro, 1984, 4(2): 79-91.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1984/V4/I2/79
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