High temperature oxidation and sulfate induced corrosion of an oxide dispersion strengthened Ni base superalloy
作者:
RaoV. M.,
BalasubramaniamR.,
UpadhyayaG. S.,
期刊:
Materials at High Temperatures
(Taylor Available online 1995)
卷期:
Volume 13,
issue 4
页码: 175-179
ISSN:0960-3409
年代: 1995
DOI:10.1080/09603409.1995.11689516
出版商: Taylor&Francis
数据来源: Taylor
摘要:
The oxidation and sulfate induced corrosion behavior of an oxide dispersion strengthened nickel base superalloy, MA 6000, has been studied at 900°C and 1000°C. The experimental program involved thermogravimetry. X-ray diffraction and scanning electron microscopy. The kinetics of high temperature oxidation in air increased with increasing temperature. The experimental activation energy for oxidation in air indicated that a chromia-rich scale formed the protective oxide layer. In the case of sulfate induced corrosion, however, increasing temperature decreased the scale growth rate. This result has been explained by considering the relative stability of nickel sulfide at 900°and 1000°C. Metallographic studies of the scales are also presented.
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