HOT CORROSION OF THREE M_3Al-TYPE INTERMETALLICS AT 600℃

Acta Metall Sin

1993, Vol. 29

Issue (4): 68-72 DOI:

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HOT CORROSION OF THREE M_3Al-TYPE INTERMETALLICS AT 600℃

NIU Yan;WU Weitao;GESMUNDO F;VIANI F;Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals; Academai Sinica; Shenyang; Instituta di Chimica; Facolta di Ingegneria; Universita di Genova Research associate;Institute of Corrosion and Protection of Metals;Academia Sinica; Shenyang 110015

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Abstract Na_2SO_4 deposits accelerate significantly the corrosion rates of 3 intermetallicsFe_3Al, Ni_3Al and Ti_3Al in the simulated combustion gases at 600℃. The corrosion product ismixture of oxides and sulphides of both the base metal and Al. Corrosion resistance of Fe_3Aland Ti_3Al is superior to that of Ni_3Al owing to the formation of an inner layer rich inAl_2O_3 for Fe_3Al and of an intermediate layer composed of TiO_2 and NbO_2 for Ti_3Al modi-fied by Nb. While, Ni_3Al forms an inner layer which is so abundant in Ni sulphide as to facili-tate the migration of Ni outward. The addition of NaCl to Na_2SO_4 has no significant influ-ence on the corrosion behaviour of the three intermetallics.

Key words: hot corrosion intermetallic aluminide M_3Al

Received: 18 April 1993

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