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The aqueous corrosion behavior of FAPY, a non-ordered Fe-Al alloy (Fe-16.1Al-5.4Cr-1.1Mo-0.11C-0.11Zr-0.06Y, at.%), was studied in various electrolytes and compared with reference materials. Corrosion rates for FAPY were much closer to that of 304L stainless steel than to the plain-carbon and low-alloy steels evaluated. Three-week crevice corrosion tests were performed in chloride-containing solutions on FAPY, and for comparison, on the Fe(sub 3)Al-based iron aluminide FAL-Mo, and 304L stainless steel. The FAPY alloy was less resistant to crevice corrosion than FAL-Mo and 304L stainless steel. In the 3.5 wt% NaCl solution, the FAPY alloy was subject to severe crevice corrosion. Slow-strain-rate corrosion tests were conducted at the free-corrosion potential and at potentiostatically-controlled anodic and cathodic potentials to evaluate the environmental-embrittlement susceptibility. It was found that the FAPY alloy was susceptible to hydrogen embrittlement and anodic-dissolution stress corrosion cracking, but at the free-corrosion potential and the hydrogen-producing-cathodic potentials, the ductilities were significantly higher than those for Fe(sub 3)Al-based iron aluminides.