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Ni-Cr-Co基高溫合金在含有水蒸汽的空氣中的高溫腐蝕行為

High Temperature Corrosion Behavior of Ni-Cr-Co Base Superalloy in Air with Water Vapor

  • 摘要: 利用熱重分析法、SEM(EDX)和X射線衍射研究了一種Ni-Cr-Co基高溫合金在兩種不同水蒸汽含量的空氣中的高溫腐蝕行為.結果表明:合金在750℃含有10%H2O的空氣中的腐蝕動力學規律為先遵從拋物線后遵從直線規律,試樣表面形成Cr2O3層,并且有內氧化物生成.合金在775℃含有5%H2O的空氣中腐蝕時,試樣表面致密的氧化層由Cr2O3,TiO2和CoCr2O4組成,同時也發生了內氧化現象.水蒸汽加速了合金的腐蝕速度.整個腐蝕過程由元素通過氧化膜的傳輸控制.

     

    Abstract: By means of TGA, SEM (EDX) and XRD, the high temperature corrosion behavior of Ni-Cr-Co base superalloy was studied at 750 ℃ and 775 ℃ in air with water vapor. The results indicate that the kinetic curve of the alloy oxidized at 750 ℃ for 2480 h in air with 10% water vapor obeys a parabolic law at the initial oxidation stage and then follows a linear law. The oxide scale mainly consists of Cr2O3 and the internal oxides, Al2O3 and TiO2, also precipitate in matrix. The protective oxide scale of the alloy oxidized at 775 ℃ for 432 h in air with 5% water vapor is composed of Cr2O3, TiO2 and CoCr2O4 and the internal oxides are Al2O3 and TiO2. The corrosion speed is quickened because of the presence of water vapor. The corrosion procedure is decided by the transmission of the elements through the oxide scale.

     

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