Corrosion Behavior of Ψ and β Quasicrystalline Al-Cu-Fe Alloy

doi:10.1007/s40195-015-0302-0

Abstract

Abstract:

Two nanostructured Al-Cu-Fe alloys, Al₆₄Cu₂₄Fe₁₂ and Al_62.5Cu_25.2Fe_12.3, have been studied. Icosahedral quasicrystalline (ψ) Al₆₄Cu₂₄Fe₁₂ and crystalline cubic (β) Al_62.5Cu_25.2Fe_12.3 cylindrical ingots were first produced using normal casting techniques. High-energy mechanical milling was then conducted to obtain ψ icosahedral and β intermetallic nanostructured powders. Electrochemical impedance spectroscopy, linear polarization resistance, and potentiodynamic polarization were used to investigate the electrochemical corrosion characteristics of the powders in solutions with different pH values. Current density (i _corr), polarization resistance (R _p), and impedance modulus (|Z|) were determined. The results showed that regardless of pH value, increasing the solution temperature enhanced the corrosion resistance of the both phases. However, the electrochemical behavior of the ψ phase indicated that its stability depends on the submerged exposure time in neutral and alkaline environments. This behavior was related to the type of corrosion products present on the surfaces of the particles along with the diffusion and charge-transfer mechanisms of the corrosion process.

Key words: Nano-quasicrystalline, Al-Cu-Fe alloy, Mechanical alloying, Corrosion

Alvaro Torres, Sergio Serna, Cristobal Patiño, Gerardo Rosas. Corrosion Behavior of Ψ and β Quasicrystalline Al-Cu-Fe Alloy[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(9): 1117-1122.

Figures/Tables 10

Fig. 1 XRD patterns showing the presence of nanostructured ψ-phase a; β-phase b powders.

Fig. 2 HRTEM images of nanostructured materials: a icosahedral quasicrystalline phase; b β crystalline phase.

Fig. 3 |Z| values versus time for the β and ψ nanostructured phases at room temperature and different pH values.

Fig. 4 Nyquist diagram for β and ψ nanostructured phases at room temperature and different pH values.

Fig. 5 Polarization curves for β and ψ phases at room temperature a and at 60 °C b for different pH values.

Table 1 pH values of the solution before and after corrosion testing of β and ψ phases

Phase	Before testing	After testing
ψ	7	8
	3	8
	11	9
β	7	8
	3	6
	11	9

Fig. 6 R p of β a and ψ b phases at room temperature and different pH values.

Fig. 7 |Z| versus time for β a and ψ b phases at 60 °C and different pH values.

Fig. 8 R p versus time of β a and ψ b phases at 60 °C and different pH values.

Fig. 9 Nyquist diagrams for β and ψ nanostructured phases at 60 °C and different pH values.

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