Abstract
Fe-30.6Mn-6.8A1-0.9C alloy steel is employed in this study to coat the chromium carbide and related hard coatings on the surface by using pack chromization process. Electrochemical test in25℃,3.5wt% aqueous solution is used to evaluate the corrosion resistance of chromized specimen in room temperature. The immersion test in 10 wt% NaCl+90 wt% Na2SO4 mixed molten salt at877℃ for 48 hours is conducted to investigate the hot corrosion resistance of chromized specimen. The (Fe,Cr)2 N(subscript 1-x)and Cr23C6 phases are found on the chromized surface, while the internal part of chromized layer is Cr7C3 phase. In general, the corrosion resistance of the chromized specimen is apparently improved. The resistance to high temperature mixed molten salt of the chromized specimen is also better than that of 430 stainless steel. However, the corrosion resistance of the chromized Fe-Mn-Alalloy steel will be affected by denseness and oxide defects in the chromized layer.
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