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Acta Metall Sin  1998, Vol. 34 Issue (2): 159-163    DOI:
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THE OXIDATION OF A TWO-PHASE Cu-50Cr ALLOY IN AIR AT 70O ─900℃
FU Guannyan;NIU Yan;WU Weitao (State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; The Chinese Academy of Sciences; Weucui Road 62; Shengyang 110015)(Department of Chemical Engineering and mechinery; Shenyang Institute of Chemical Technology; Shenyang110021)
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FU Guannyan;NIU Yan;WU Weitao (State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; The Chinese Academy of Sciences; Weucui Road 62; Shengyang 110015)(Department of Chemical Engineering and mechinery; Shenyang Institute of Chemical Technology; Shenyang110021). THE OXIDATION OF A TWO-PHASE Cu-50Cr ALLOY IN AIR AT 70O ─900℃. Acta Metall Sin, 1998, 34(2): 159-163.

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Abstract  The two-phase Cu-50Cr alloy in air at 70─900℃ was corroded nearly parabolically, except at 900℃ when the instataneous parabolic rate constat decreased with time. The scales were consisted of an outer layer of copper oxide and an inner layer of a copper oxide or double oxide Cu2Cr2O4, in which the particles of chromiumare surrounded by chromia and the double Oxide Cu2Cr2O4. A nearly continuous Cr2O3 layer only appears at interface between the scale and matrix at 900℃. The formation of a continuous outer layer of chromia was more difficult on two-phase M-Cr alloy than single-phase M-Cr alloy.
Key words:  Copper-Chromium two-phase alloy      oxidation     
Received:  18 February 1998     
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