Corrosion mechanism of a NiCoCrAlTaY coated Mar-M247 superalloy in molten salt vapour

Corrosion mechanism of a NiCoCrAlTaY coated Mar-M247 superalloy in molten salt vapour
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NiCoCrAlTaY涂层Mar-M247高温合金在熔盐蒸气中的腐蚀机制

DOI:
10.1016/j.corsci.2011.10.021
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发表时间:
2012-02
期刊:
影响因子:
8.3
通讯作者:
Zhang L.
Zhang L.
中科院分区:
材料科学1区
文献类型:
--
作者:
Mei H.;Liu Y.;Cheng L.;Zhang L.

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提出了与NiCoCrAlTaY涂层的Mar-M247高温合金在900°C熔融Na 2SO 4盐蒸汽中暴露有关的腐蚀机理。腐蚀过程表明,在4.6×10− 6 mg 2cm −4s−1的速率下出现抛物线“扩散控制”区域I,在2.28×10− 5 mg 2cm −4s− 1和4.35×10− 5 mgcm − 2s−1的速率下出现抛物线和线性“反应-扩散控制”区域II,最后在与未涂层高温合金相同的速率下出现完全的“反应控制”区域III。结合腐蚀机理,合理地建立了各区域及全过程的腐蚀动力学方程。
A mechanism of corrosion is proposed relating to a NiCoCrAlTaY coated Mar-M247 superalloy exposure in molten Na2SO4salt vapour at 900°C. The corrosion process indicates the parabolic “diffusion controlled” region I at rate of 4.6×10−6mg2cm−4s−1, the combination of parabolic and linear “reaction–diffusion controlled” region II at rate of 2.28×10−5mg2cm−4s−1and 4.35×10−5mgcm−2s−1, and finally the complete “reaction controlled” region III at the same rate of 3.92×10−4mgcm−2s−1as the uncoated superalloy. The corrosion kinetics of each region and of the whole process are formulated rationally associated with the corrosion mechanism.
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发表时间: 2003-01
影响因子: 4.6
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