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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 5    October 2008

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Effect of Y2O3 on microstructure and oxidation of chromizing coating
ZHOU Yue-bo(周月波), ZHANG Hai-jun(张海军), WANG Yong-dong(王永东)

College of Materials Science and Engineering, Heilongjiang Institute of Science and Technology,Harbin 150027, China

Abstract:A Y2O3-modified chromizing coating was produced by chromizing an as-electrodeposited Ni-Y2O3 composite film using pack cementation method at 1 100 ℃ for 3 h. For comparison, chromizing was also performed under the same condition on an as- deposited Ni film without Y2O3 particles. Oxidation at 900 ℃ for 120 h indicates that although on both two chromizing coatings chromia scales grow during oxidation, the Y2O3-modified chromizing coating exhibits an increased oxidation resistance due to the formation of thinner, denser and finer-grain scale. The effect of Y2O3 on the coating formation and the coating oxidation behavior was discussed in detail.

 

Key words: Y2O3; electrodeposition; chromizing; oxidation; reactive element effect

ISSN 1672-7029
CN 43-1423/U

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