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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 6    No. 1    March 1996

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INTERNAL CHLORINATION OF Ni-Cr-Ce ALLOYEXPOSURE TO CHLORINE AT 575 ℃
Tu Jiangping,Liu Maoshen,Mao Zhiyuan,Li Zhizhang

Department of Materials Science and Engineering Zhejiang University,Hangzhou 310027

Abstract:The kinetics of internal chlorination of Ni-Cr-Ce alloy in chlorine at 575℃ has been studied. Internal chlorination of Ni-Cr-Ce alloy occurred to formation of CrCl2 and CeCl3 solid preeipi-tates which is thermodynamically stable and has lower vapor pressure at the temperature along grain  initial corrosion stage,the internal chlorination rate nearly followed parabolic rate law, the internal chlorination was accompanied by the consumption of the alloy by volatilization corrosion  which obeyed a linear rate equation,the thickness of the internal chlorination region would be governed  by a paralinear rate equation. After a sufficiently long period of corrosion, the rate of internal chlorina-tion would be equal to the rate of overall metal consumption,the depth of internal chlorination op-proaches a steady state value.  Addition of Ce to Ni-Cr alloy increased the degree of internal chlorina-tion

 

Key words: internal chlorination  vapor pressure  chloride

ISSN 1672-7029
CN 43-1423/U

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