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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 4    No. 2    June 1994

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HIGH TEMPERATURE CORROSION OF PREOXIDIZED Ni-Al ALLOY IN CHLORINE
Tu Jiangping ; Li Zhizhang ; Mao Zhiyuan

Deoartment of Materials Science and Engineering; Zhejiang University; Hang zhou 310027

Abstract:The chlorination behavior of preoxidized Ni-3.5Al alloy at 575C was investigated. The corrosion resistance of preoxidized alloy against chlorination had been improved due to the formation of protective NiO/Al2O3 scale. In chlorine atmosphere at high temperature.chlorine attackedthe oxide scale by three mechanisms:mechanical damage by volatile chlorides,scale pitting andspalling by chlorine dissolving in the scale and oxides being displaced by chlorides.

 

Key words: chlorination  oxide  scale  chloride  vapor pressure  preoxidization

ISSN 1672-7029
CN 43-1423/U

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