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1998•Acta Metallurgica SinicaRequires access

THE OXIDATION OF A TWO-PHASE Cu-50Cr ALLOY IN AIR AT 70O ─900℃

FU Guannya

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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.

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What this paper is about

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.

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Available 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 concepts: Chromia, Alloy, Materials science, Oxide, Layer (electronics), Phase (matter), Copper, Metallurgy

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