几种镍基高温合金铝、铬涂层的抗热腐蚀性能

中国腐蚀与防护学报

1985, Vol. 5

Issue (4): 291-297

研究报告

本期目录 | 过刊浏览

几种镍基高温合金铝、铬涂层的抗热腐蚀性能

楼翰一

中国科学院金属研究所

HOT CORROSION BEHAVIOUR OF CHROMIZED OR ALUMINIZED COATING ON VARIOUS Ni--BASE SUPERALLOYS

Lou Hanyi The Institute of Metals Research; Academia sinica

全文: PDF(2254 KB)

摘要: 本文对五种高温合金及三种铝、铬涂层,用坩埚融盐全浸法,在700～900℃进行了热腐蚀试验,发现除 GH30外,其余合金上的铝涂层都比铬涂层耐热腐蚀。这可能是因为 Al_2O_3膜比Cr_2O_3 膜致密,且 Cr_2O_3 易与氧离子 O~(2-)反应,生成铬酸盐,Cr_2O_3在融盐中的溶解度也比Al_2O_3大。试验表明,GH30合金上铝涂层抗腐蚀性差是因为βNiAl 相存在大量晶界,产生沿晶内氧化。

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.

收稿日期: 1985-08-25

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引用本文:

楼翰一. 几种镍基高温合金铝、铬涂层的抗热腐蚀性能[J]. 中国腐蚀与防护学报, 1985, 5(4): 291-297.
. HOT CORROSION BEHAVIOUR OF CHROMIZED OR ALUMINIZED COATING ON VARIOUS Ni--BASE SUPERALLOYS. J Chin Soc Corr Pro, 1985, 5(4): 291-297.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1985/V5/I4/291

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[3] Kubaschewski,O.;Hopkins,B.E.Oxidation of Metals and Alloys,London,24(1962)
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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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