Electrochemical corrosion characterization of nickel aluminides in acid rain
Por:
Huape Padilla, Engelbert, Medina Flores, Ariosto, Aguilar Ramirez, Claudio, Alfonso Lopez, Ismeli, Bejar Gomez, Luis
Publicada:
1 ene 2018
Resumen:
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. © 2018, Universidade Federal do Rio de Janeiro. All rights reserved.
Filiaciones:
Huape Padilla, Engelbert:
Univ Michoacana, Fac Ingn Mecan, Santiago Tapia 403, Morelia 58000, Michoacan, Mexico
Medina Flores, Ariosto:
Univ Michoacana, Inst Invest Met & Mat, Santiago Tapia 403, Morelia 58000, Michoacan, Mexico
Aguilar Ramirez, Claudio:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Unidad Morelia, Antigua Carretera Patzcuaro 8701 Col Exhacienda S, Morelia 58190, Michoacan, Mexico
Alfonso Lopez, Ismeli:
Univ Tecn Federico Santa Maria, Dept Ingn Met & Mat, Ave Espana 1680, Valparaiso, Chile
Bejar Gomez, Luis:
Univ Michoacana, Fac Ingn Mecan, Santiago Tapia 403, Morelia 58000, Michoacan, Mexico
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