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HIGH TEMPERATURE CORROSION OF Ni-Cr-Ce ALLOY IN CHLORINE GAS AFTER PREOXIDIZATION IN AIR AT 700℃ |
Tu Jiangping; Mao Zhiyuan; Li Zhizhang(Zhejiang University) |
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Abstract The chlorination behavior of preoxidized Ni-13.2Cr-0.47Ce alloy was investigated thermogravimetrically between 400℃ and 700℃ In Cl2 the formation of volatile chlorides occurred. Preoxidized samples of the Ni-Cr-Ce alloy showed better resistance against chlorination than as received samples because of the formation of protective chide scale.During chlorination at lower temperature,weight change of the alloy versus time followed parabolic rate low.Oxide scale exhibited only slight damage after long-time come sion.At medium temperatures,the chide scale aller long-time exposure,showed up a severely blistered morphology.At higher temperatures,oxide scale was destroyed even in a short time.The rate of corrosion increased rapidly and there was a linear decrease in weight with time.
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Received: 25 August 1994
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1HancockPSymposiumonhalidechemistry,electrochem,soc,1978,1:6452MoonDP.Oxid.Metal,1989,32:473KubaschewskiO,AlcockCBMetall.Thermochem;5thEdition,Pergamonpress,1977;387 |
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