Abstract
Due to the coal combustion that generates halides, steel components can confront hot corrosion during applications at high temperature. The hot-dipping aluminum (HDA) was operated on the 9Cr–Mo steel (grade 91) to form the iron aluminide layer. A hot corrosion-loading test of aluminized grade 91 (HDA-91) was carried out by covering a salt mixture of NaCl/Na2SO4 under static load ranging from 75 to 100 MPa at 600 °C and 700 °C, respectively. The failure mechanism was assessed after various elongations using scanning electron microscopy and optical microscopy. The results showed that HDA-91 presented higher hot corrosion resistance than the uncoated grade 91. The aluminide layer formed a higher ductility oxide and prevented the substrate form grain-boundary oxidation at high temperatures, resulting in durability. The results also revealed a significant improvement in reduction of area during the hot corrosion-loading test for grade 91 that underwent HDA treatment.
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The authors are very grateful to the Ministry of Science and Technology of Republic of China for funding support Grant No. 107-2221-E-011-008-.
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Liang, HC., Wang, CJ. Effect of Iron-Aluminide Coating on the Fracture Mechanism of Ferritic–Martensitic Steel in Coal-Fired Boilers Environment. Oxid Met 92, 457–470 (2019). https://doi.org/10.1007/s11085-019-09941-x
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DOI: https://doi.org/10.1007/s11085-019-09941-x