CORROSION BEHAVIOR OF Al-DIFFUSION COATINGS ON IN738LC IN ALKALI MELTS AT 1173K

J Chin Soc Corr Pro

1984, Vol. 4

Issue (4): 251-262 DOI:

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CORROSION BEHAVIOR OF Al-DIFFUSION COATINGS ON IN738LC IN ALKALI MELTS AT 1173K

Wu Weitao(Institute of Corrosion and Protection of Metals; Academia Sinica; Shenyang; China) Rahmel; A.; Schorr; M.(DECHEMA Institut; Frankfurt/Main; West Germany)

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Abstract The corrosion behavior and the influence of the electrode potential on the corrosion behavior of simple Al-diffusion coating and Pt-containing Al-diffusion coating LDC-2 have been studied in a 90 mol.％ Na_2SO_4+10mol.% K_2SO_4 melt at 1173K.Both coatings exhibit a passive potential range, in which a protective oxide scale is formed on top of the coatings. The passive range of the Pt-containing coating LDC-2 is broader than that of the Pt-free coating, The Pt-free coating corrodes substantially faster in the passive range than the Pt-containing coating.The breakthrough potentials for acidic fluxing are close to each other for both coatings, but the LDC-2 type coating has significant higher resistance to basic fluxing than the Pt-free coating. The difference in basic breakthrough potentials of the coatings is approx. 400mV.The beneficial influence of Pt on the behavior of the Al-diffusion coating has also been discussed.

Received: 25 August 1984

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Wu Weitao(Institute of Corrosion and Protection of Metals; Academia Sinica; Shenyang; China) Rahmel; A.; Schorr; M.(DECHEMA Institut; Frankfurt/Main; West Germany). CORROSION BEHAVIOR OF Al-DIFFUSION COATINGS ON IN738LC IN ALKALI MELTS AT 1173K. J Chin Soc Corr Pro, 1984, 4(4): 251-262.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1984/V4/I4/251

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