THE EFFECT OF CHROMIUM ON THE CORROSION-RESISTANCE OF ALUMINIDE COATINGS ON NICKEL AND NICKEL-BASED SUBSTRATES

被引：17
作者：
GODLEWSKI, K
GODLEWSKA, E
机构：
[1] Institute of Materials Science, Academy of Mining and Metallurgy, Kraków
来源：
MATERIALS SCIENCE AND ENGINEERING | 1987年 / 88卷
关键词：
D O I：
10.1016/0025-5416(87)90073-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The aluminide and CrAl diffusion coatings on nickel and the nickel-based alloy EI 867 obtained by a two-step pack cementation technique were subjected to various corrosion tests consisting of oxidation under thermal cycling conditions as well as isothermal oxidation in the presence of fused Na2SO4. The presence of chromium in the surface layer of aluminide coatings had a beneficial effect on their resistance to oxidation in that the oxide layer formed was less prone to spallation. This type of coating microstructure also appeared to be advantageous with respect to hot corrosion since pitting, which is typical of the degradation of aluminide coatings, was not observed. It is postulated that the chromium-enriched zone acts as a barrier to the oxidation of refractory metals (molybdenum, tungsten and vanadium) present in somewhat deeper coating layers in the form of carbide or intermetallic phases, thus preventing the onset of catastrophic corrosion. © 1987.
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页码：103 / 109
页数：7
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