Aqueous Corrosion Behavior of Iron aluminide Intermetallics

Abstract

Iron aluminide intermetallics based on DO 3 ordered structure are being developed for use as structural materials and cladding material for conventional engineering alloys. Aqueous corrosion behavior of iron aluminides has been studied extensively by electrochemical techniques. Studies were carried out on pure Fe (99.9%), Fe-28Al (at.%), Fe-28Al-3Cr (at.%), and AISI SS 304 so as to compare and contrast their behavior in same experimental condition. Polarization behavior under different pH conditions was examined to evaluate their performance in acidic, basic, and neutral solutions. Pitting behavior was also studied in solution containing Cl -1 ions. The stability of the passive film formed was studied by current time transients and potential decay profiles. The presence of 3 at.% Cr in iron aluminides was found to improve the aqueous corrosion resistance and makes it comparable to AISI SS 304.

Electrochemical Corrosion Behavior of Fe3Al/TiC and Fe3Al-Cr/TiC Coatings Prepared by HVOF in NaCl Solution

“…A number of studies were thus concentrated on the aqueous corrosion behavior of these materials to test their durability in various corrosive environments. The corrosion behavior of iron aluminides has been studied in several acidic and basic solutions [18][19][20][21][22][23][24]. Chiang et al [18] evaluated the passivation behavior of Fe-Al alloys containing 3.4, 10.4, 18.7, 19.4, 29.5, and 41.7 at.…”

“…In addition, when the Al content of Fe-Al alloys exceeds this limit, further increment of Al content has only a slight influence on passivation. Sharma et al [19] compared the stability of the passive film and pitting behavior of Fe-28Al (at. %) and Fe-28Al-3Cr (at.…”

Vacuum Arc Melting Processed Fe-Al Matrix Based Intermetallic Composites, Reinforced with VC Phases: Assessment of Microstructure, Sliding Wear and Aqueous Corrosion Response

“…It has been almost two decades since it was realized that iron aluminides -Fe 3 Al andFeAl -comprise an interesting class of intermetallic materials as potential candidates for the substitution of stainless steels in structural applications at both moderate andhigh temperatures due to attractive properties such as good wear [1][2][3][4][5][6][7][8] and excellentcorrosion resistance [9] even at high temperatures, ease of fabrication, low productioncost, reduced density compared to other ferrous alloys and reasonable strength up to 550°C. The main drawbacks for the commercialization of such materials are their poor room temperature ductility and strength decrease above 550°C [10]. Researchers have been attempting to solve these problems either by using nonconventional manufacturing/processing routes or/and by elemental alloying additions [8][9][10].…”

“…The main drawbacks for the commercialization of such materials are their poor room temperature ductility and strength decrease above 550°C [10]. Researchers have been attempting to solve these problems either by using nonconventional manufacturing/processing routes or/and by elemental alloying additions [8][9][10].…”

Effect of copper alloying addition on the electrochemical corrosion behaviour of Fe3Al intermetallic in sulphuric acid solution

“…Another strong point of iron aluminides is their low density [ρ = 6.6 g cm −3 ] compared to steels [ρ = 7.8 g cm −3 ] and nickel‐based alloys [ρ = 8.5 g cm −3 ]. Applications include jet engine compressor blade and housing, heat exchangers, furnace fixtures as well as piping and tubing for power generations and chemical industries . Two factors limit the further use of these alloys: their poor room temperature ductility and low strength above 873 K .…”