MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
The Influence of CoNiCrAlY Addition on the High Temperature Corrosion Behavior of CrSi2 Alloy in an Air–Na2SO4–NaCl Gas Atmosphere
Toto SudiroTomonori SanoShoji KyoOsamu IshibashiMasaharu NakamoriKazuya Kurokawa
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2012 Volume 53 Issue 9 Pages 1627-1632

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Abstract

In this study, an attempt has been made to improve the resistance of CrSi2 alloy toward high temperature corrosion and promote the formation of a continuous and slow-growing SiO2 scale on the alloy surface. For this purpose, spark plasma sintering was used to fabricate the CrSi2 alloys containing various amounts of CoNiCrAlY. The sintered alloys were then corroded isothermally in an air–Na2SO4–NaCl gas atmosphere at three different temperatures of 923 and 1073 K for up to 720 ks and at 1273 K for 72 ks. XRD, SEM and SEM-EDS were utilized to examine the alloy structures and compositions before and after the high temperature corrosion test. The influence of CoNiCrAlY addition on the high temperature corrosion behavior of the CrSi2 alloy was clarified.

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© 2012 The Japan Institute of Metals and Materials
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