Corrosion behavior of a spark plasma sintered Fe–20Mn–11Al–1.8C–5Cr alloy in molten aluminum
The corrosion behavior of an Fe–20Mn–11Al–1.8C–5Cr alloy prepared by spark plasma sintering was investigated via immersion tests in molten aluminum at 750 °C for 1 and 4 h, respectively, and a hot work steel (AISI H13) was included as a reference. The experimental results show that the corrosion rate of Fe–20Mn–11Al–1.8C–5Cr alloy is ~ 24% of that of H13 steel, suggesting that Fe–20Mn–11Al–1.8C–5Cr alloy in molten aluminum possesses better corrosion resistance than H13 steel. Detailed analysis show that κ-carbide ((Fe, Mn)3AlC x ) and Cr7C3 carbide precipitated in the matrix play a key role in enhancing the corrosion resistance of Fe–20Mn–11Al–1.8C–5Cr alloy in molten aluminum. Both of them show better corrosion resistance than γ-Fe matrix and H13 steel, and can also take on the role of roots in grasping the corrosion product and restrain them from spalling into the molten aluminum.
KeywordsFe–Mn–Al–C–Cr alloy Molten aluminum Immersion Corrosion behavior
This research was funded by National Natural Science Foundation of China (51271080) and Opening Project of Guangdong Key Laboratory for Advanced Metallic Materials Processing (South China University of Technology) (Grant No. GJ201609).
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