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| HOT CORROSION BEHAVIOUR OF CHROMIZED OR ALUMINIZED COATING ON VARIOUS Ni--BASE SUPERALLOYS |
| Lou Hanyi The Institute of Metals Research; Academia sinica |
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Abstract Specimens of five Ni-base alloys coated by three coating techniques were tested by crucible method at 700～900℃.It was found that aluminized coating was more resistant to hot corrosion than chromized one on all of teated alloys except GH30.It seems probable that the Al_2O_3 film is more compact than the Cr_2O_3 film,the latter preferentially reacts with O~(2-) ion to form chromate, and the solubility of Cr_2O_3 in molten salt is larger than that of Al_2O_3.Experi- ments showed that the aluminized coating on GH30 was less resistant on account of a larger amount of grain boundaries in β-NiAl phase perpendicular to surface with consequently more serious internal oxidation and hot corrosion along them.
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Received: 25 August 1985
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[2] 楼翰一,邵玉霞,腐蚀与防护报告集(第一辑),辽宁省腐蚀与防护学会,101(1982)
[3] Kubaschewski,O.;Hopkins,B.E.Oxidation of Metals and Alloys,London,24(1962)
[4] Mrowec,S.,Proceedings 8th International Congress on Metallic Corrosion,2110(1980)
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[6] Bornstein,N.B.,DeCrescente,M.A.,Roth,H.A.,Deposition and Corrosion in Tnrbines,London,70(1973) |
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