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| HIGH TEMPERATURE CHLORINATION OF Ni-20Cr ALLOY |
| Shen Jianian(State Key Laboratory of Corrosion and Protection;Institute of Corrosion and Protection of Metals;The Chinese Academy Of Sciences; Shenyang 110015)Wang Ge RAPP Robert A.(Depart.Of Mater.Set.8 Egg.;The Ohio State University Columbus.OH.;13210; |
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Abstract High temperature chlorination behavior of Ni-20Cr alloy in a (HCl+H2) gas mixture was studied.Thermodynamic calculations predicted that there are two different regimes of stable chlorination productsdepending on gas ration of PHcl/PH2 and temperature.In the regime of lower ratio of PHcl/PH2 andhigher temperature,the only important chlorination product is volatile CrCl2(g), and in the regime of higherratio of PHcl/PH2 and loWer temperature,the condensed phase CrCl2(c)becomes thermodyllamicallystable. The chlorination kinetics study was carried out in the two different regimes by TGA measurements.A time dependent mass loss rate was observed in first experimental regime. Further analysis of tile kineticdata indicated that the chlorination rate limiting process is a linear gas phase transport in series witha parabolic process of the substrate diffosion of Cr. In the second experimental regime,the growth ofcondensed product leads to m~ gain behavior. The surfaCe of the alloy after chlorination in the firstregime showed pitting morphology. A surfaCe scale was visible for the alloy after chlorination in the secondregime. These obserVations are consistent with the expectation of the thermodynamic analysis and theresults of kinetic measurements.
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Received: 25 June 1995
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Cite this article:
Shen Jianian(State Key Laboratory of Corrosion and Protection;Institute of Corrosion and Protection of Metals;The Chinese Academy Of Sciences; Shenyang 110015)Wang Ge RAPP Robert A.(Depart.Of Mater.Set.8 Egg.;The Ohio State University Columbus.OH.;13210; . HIGH TEMPERATURE CHLORINATION OF Ni-20Cr ALLOY. J Chin Soc Corr Pro, 1995, 15(3): 189-195.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1995/V15/I3/189
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