Electrochemical corrosion behaviour of (100), (110) and (111) Fe 3 Al single crystals in sulphuric acid

Brito, Pedro; Schüller, E.; Silva, Josafá; Campos, Thais Roberta; Araújo, Carlos Roberto de; Carneiro, José Rubens Gonçalves

doi:10.1016/j.corsci.2017.05.029

Cited by 24 publications

(8 citation statements)

References 31 publications

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“…This is an indication that the Al-content and the resulting variation of crystal structure from D03 (Fe-11Al) to B2 (Fe-25Al) did not modify the anodic reaction of the freely corroding surfaces. The obtained values are consistent with previous observations concerning the corrosion behavior of iron aluminides in sulfuric acid, which yield Fe 2+ as the main dissolved species [11] by Fe3Al(s) → 3Fe 2+ (aq) + Al(s) + 6ein case of the Fe-11Al and Fe-15Al alloys, and FeAl(s) → Fe 2+ (aq) + Al(s) + 2efor the Fe-25Al alloy. The cathodic reaction is in turn given by 2H + + 2e -→ H2.…”

Section: Corrosion Behaviorsupporting

confidence: 91%

Archives of Foundry Engineering

Silva,

Brito,

Martins

2022

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Iron aluminides are iron-aluminum alloys that have excellent resistance to oxidation at high temperatures with low density, high resistance/weight ratio and a low manufacturing cost. Due to its characteristics, these alloys are presented as an option to replace stainless steels in certain applications. This works intends report the casting process and subsequent analyses involving microstructure, mechanical properties, and corrosion resistance of two Fe-Al-C alloys (Fe-11wt%Al and Fe-25wt%Al, containing 0.31-0.37%C), which were prepared in an induction furnace and poured in a permanent mold. Samples of these alloys were characterized and presented elevated hardness values of 37 HRC (alloy Fe-11wt%Al) and 49.6HRC (alloy Fe-25wt%Al) and microstructure with aluminides type Fe3Al and FeAl and also carbides type K. The Fe-11wt%Al alloy exhibited superior resistance to uniform corrosion, although both Fe-Al-C alloys exhibited significantly higher corrosion rates compared to a binary iron aluminide in 0.5M H2SO4 containing naturally dissolved oxygen.

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Section: Corrosion Behaviorsupporting

confidence: 91%

Archives of Foundry Engineering

Silva,

Brito,

Martins

2022

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“…Our choice is motivated by the fact that these materials can have the concentration of quenched-in vacancies as high as a few percent [22,23,24]. Iron-aluminides are interesting for their possible high-temperature applications due to their oxidation resistance [25], stability in molten salts [26], relatively low density, electrical resistivity and low cost of raw materials [27,28,29]. Their wider use is partly hampered by their environmental embrittlement [30,31,32,33] but there is recently a renewed interest in these materials [25,34,35,36,37,38,39,40,41,42,43], including also Fe-Al-based nanocomposites [44,45,46,47,48,49,50,51,52,53,54,55,56,57].…”

Section: Introductionmentioning

confidence: 99%

An Ab Initio Study of Vacancies in Disordered Magnetic Systems: A Case Study of Fe-Rich Fe-Al Phases

et al. 2019

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We have performed quantum-mechanical calculations to examine the impact of disorder on thermodynamic, structural and electronic (magnetic) properties of Fe-Al systems with vacancies. A series of supercells was used and their properties were computed employing density-functional theory (DFT) as implemented in the VASP package. Our case study is primarily aimed at a disordered solid solution Fe 81.25 Al 18.75 but we have compared our results also with those obtained for the ordered Fe 3 Al intermetallic compound for which experimental data exist in literature. Both phases are found in Fe-Al-based superalloys. The Fe-18.75at.%Al solid solution was simulated using special quasirandom structures (SQS) in three different disordered states with a different distribution of Al atoms. In particular, we have considered a general disordered case (an A2-like variant), the case without the first nearest neighbor Al-Al pairs (a B2-like distribution of atoms) and also the case without both the first and second nearest neighbor Al-Al pairs (the D0 3 -like variant, in fact, an Fe-rich Fe 3 Al phase). The vacancy formation energies as well as the volumes of (fully relaxed) supercells with vacancies showed a large scatter for the disordered systems. The vacancy formation energies decrease with increasing concentration of Al atoms in the first coordination shell around the vacancy (an anti-correlation) for all disordered cases studied. The computed volumes of vacancies were found significantly lower (by 25–60%) when compared with the equilibrium volume of the missing atoms in their elemental states. Lastly, we have analyzed interactions between the vacancies and the Fe atoms and evaluated vacancy-induced changes in local magnetic moments of Fe atoms.

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“…i corr is the corrosion current density. The cathodic branches and E corr are used to fit the i corr [37,38].…”

Section: Resultsmentioning

confidence: 99%

De-alloying Behavior of Mg–Al alloy in Sulphuric Acid and Acetic Acid Aqueous Solutions

Wei

Yang

2019

Materials

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The fabricated Mg–Al alloy consists of α-Mg phase and Mg–Mg17Al12 eutectic phase. The corrosion behavior of cast Mg–Al alloy in sulphuric acid (H2SO4) and acetic acid (HAc) aqueous solutions was investigated. The Mg–Al alloy shows general corrosion in H2SO4 solution, and the α-Mg dendrites revealed a slightly faster corrosion rate than that of the eutectics. In HAc solution, the alloy shows an obvious selective corrosion characteristic, with the α-Mg dendrites being corroded preferentially. Grain orientation plays an important role in corrosion behavior of the alloy in the HAc solutions.

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Electrochemical corrosion behaviour of (100), (110) and (111) Fe 3 Al single crystals in sulphuric acid

Cited by 24 publications

References 31 publications

Archives of Foundry Engineering

Archives of Foundry Engineering

An Ab Initio Study of Vacancies in Disordered Magnetic Systems: A Case Study of Fe-Rich Fe-Al Phases

De-alloying Behavior of Mg–Al alloy in Sulphuric Acid and Acetic Acid Aqueous Solutions

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