The hot corrosion behavior of Fe40Al intermetallic alloyed with Ag, Cu, Li, and Ni (1–5 at.%) in NaCl-KCl (1 : 1 M) at 670°C, typical of waste gasification environments, has been evaluated by using polarization curves and weight loss techniques and compared with a 304-type stainless steel. Both gravimetric and electrochemical techniques showed that all different Fe40Al-base alloys have a much higher corrosion resistance than that for stainless steel. Among the different Fe40Al-based alloys, the corrosion rate was very similar among each other, but it was evident that the addition of Li decreased their corrosion rate whereas all the other elements increased it. Results have been explained in terms of the formation and stability of an external, protective Al2O3layer.
A study on the effect of the addition of 1 at-% noble elements such as Pt, Pd, Ag and Au on the oxidation resistance of Fe 3 Al intermetallic alloy has been carried out at 900, 1000 and 11008C during 100 h. For comparison, the same tests were performed on a Ni-base alloy type Inconel 600. At all the tested temperatures, parabolic growth rate was observed for the different alloys. The effect of the different noble elements was not unique at the different tested temperature. Thus, at 9008C, addition of Ag increased the mass gain, whereas Pd decreased it; at 10008C, however, the opposite was true. At 11008C, the mass gain was decreased by adding Pt, but Pd was very detrimental. In most of the cases, the scales were predominantly formed by Al 2 O 3 with minor amounts of Fe 2 O 3 . Scale spallation was found when the noble elements were randomly distributed on the surface, but when they were finely distributed, the scale did not spall. In all cases, the mass gain for Fe 3 Al alloy was lower than Inconel 600 type alloy.
The corrosion behaviour of Fe 3 Al intermetallic alloyed with 1 at-%Ag, Au, Pt and Pd in NaCl-KCl (1 : 1M) at 700uC, typical of waste gasification environments, has been evaluated using polarisation curves, linear polarisation resistance and electrochemical impedance spectroscopy measurements and compared with an Ni based alloy, namely Inconel 600. Results have shown that, for short testing times, the addition of noble elements increased the corrosion rate for base Fe 3 Al intermetallic alloy, but it was decreased for long testing times by forming a protective corrosion product layer. Additionally, base Fe 3 Al intermetallic alloy had higher corrosion rates than Inconel 600.
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