Electrochemical corrosion characterization of nickel aluminides in acid rain
| Autor: | Ismeli Alfonso López, Luis Gómez, Ariosto Medina Flores, Claudio Aguilar Ramírez, Engelbert Huape Padilla |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Nial
Materials science Alloy Intermetallic General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Acid Rain engineering.material 01 natural sciences Nanoindentation Corrosion Electrochemical impedance spectroscoy 0103 physical sciences General Materials Science Polarization (electrochemistry) computer.programming_language 010302 applied physics Metallurgy General Chemistry 021001 nanoscience & nanotechnology Dielectric spectroscopy Superalloy Nickel chemistry Nickel Aluminides engineering 0210 nano-technology computer |
| Zdroj: | Matéria (Rio de Janeiro) v.23 n.2 2018 Matéria (Rio de Janeiro. Online) instacron:RLAM Matéria (Rio de Janeiro), Volume: 23, Issue: 2, Article number: e11998, Published: 19 JUL 2018 |
| Popis: | Nickel aluminides have been extensively studied in recent decades to replace superalloys, in some components of aircraft turbines, because they have excellent corrosion resistance. Many industrial cities have the problem of air pollution, which has forced the study of the degradation of these alloys in the presence of acid rain. The aim of this work is to study the electrochemical corrosion behavior of nickel aluminides in a medium of simulated acid rain. Potentiodynamic Polarization, Linear polarization resistance curves, Rp, Nyquist data and Bode curves obtained by electrochemical impedance spectroscopy were used to study the corrosion behavior of two intermetallic compounds. The polarization curves show that both intermetallic Ni3Al and NiAl have very similar corrosion potential, showing a slightly nobler behavior the NiAl intermetallic. The intermetallic Ni3Al has an active-passive behavior where the anode branch presents a general dissolution of the alloy, indicating that it is under cathodic control. NiAl intermetallic shows an active dissolution region, followed by a passive behavior. At longer immersion times, Ni3Al intermetallic has a higher polarization resistance, which means a lower corrosion rate. Keywords: Nickel Aluminides, Electrochemical impedance spectroscoy, Acid Rain, Nanoindentation. |
| Databáze: | OpenAIRE |
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