Abstract
The corrosion behavior of the Fe40Al60nanostructured intermetallic composition was studied using electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques with an innovative electrochemical cell arrangement. The Fe40Al60(% at) intermetallic composition was obtained by mechanical alloying using elemental powders of Fe (99.99%) and Al (99.99%). All electrochemical testing was carried out in Fe40Al60particles that were in water with different pH values. Temperature and test time were also varied. The experimental data was analyzed as an indicator of the monitoring of the particle corrosion current densityicorr. Different oxide types that were formed at surface particle were found. These oxides promote two types of surface corrosion mechanisms: (i) diffusion and (ii) charge transfer mechanisms, which are a function oficorrbehavior of the solution, pH, temperature, and test time. The intermetallic was characterized before and after each test by transmission electron microscopy. Furthermore, the results show that at the surface particles uniform corrosion takes place. These results confirm that it is possible to sense the nanoparticle corrosion behavior by EIS and LPR conventional electrochemical techniques.
Highlights
In the past, intermetallic materials based on aluminum with transition metals such as Ni, Ti, Co, and Fe have been extensively investigated [1,2,3,4,5,6,7,8,9]
The corrosion behavior of the Fe40Al60 nanostructured intermetallic particles was strongly affected by the temperature and different types of oxides formed at the particles surfaces
The oxide type formed can vary according to its solution solubility that depends on whether the solutions were acid/basic of pure water
Summary
Intermetallic materials based on aluminum with transition metals such as Ni, Ti, Co, and Fe have been extensively investigated [1,2,3,4,5,6,7,8,9]. It has been reported that Fe40Al60 nanostructured material improves in general their physical properties [12]. In this sense, the mechanical alloying is an effective technique to achieve very fine crystal sizes (nanometer), getting better material properties [13]. Concerning Fe40Al60 intermetallic with nanosized particles (100 nm) obtained by mechanical alloying, there is no information related to their corrosion behavior in aqueous solution at long exposure times. This is due to the absence of a technique or equipment designed for these purposes. The aim of the present work is the application of such electrochemical techniques in Fe40Al60 intermetallic nanocrystals to monitor the aqueous corrosion performance for long periods of time
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