Comparative Study on the Corrosion Resistance of Al-Cr-Fe Alloy Containing Quasicrystals and Pure Al

doi:10.1016/j.jmst.2016.07.005

Abstract

Abstract:

Al-Cr-Fe alloy containing quasicrystals has been consolidated using spark plasma sintering (SPS). Its corrosion resistance properties were comparatively investigated with pure Al by electrochemical methods in 3.5 wt% NaCl solution. Their corrosion current density was also compared with that of three commercial steels—316 stainless steel, AISI 440C stainless steel and AISI H13 tool steel. Al-Cr-Fe alloy exhibits nobler corrosion potential and evident passivation with a potential range of around 150 mV while no passivation of pure Al sample is seen. The corrosion resistance of Al-Cr-Fe alloy is less than that of pure Al, but is close to that of 316 stainless steel and superior to that of AISI 440C stainless steel and AISI H13 tool steel.

Key words: Quasicrystal, Spark plasma sintering, Microstructure, Corrosion resistance

Li R.T.,K. Murugan Vinod,Dong Z.L.,Khor K.A.. Comparative Study on the Corrosion Resistance of Al-Cr-Fe Alloy Containing Quasicrystals and Pure Al[J]. J. Mater. Sci. Technol., 2016, 32(10): 1054-1058.

Figures/Tables 9

Table 1 Composition of commercially pure Al pellet

Element	Si	Fe	Total impurity	Al
Content	<0.015	<0.015	<0.03	>99.97

Fig. 1. Morphology of as-received Al-Cr-Fe powders.

Fig. 2. Microstructure of the sintered Al-Cr-Fe pellet: (a) SEM BSE image, (b) STEM image.

Fig. 3. OCP for pure Al and Al-Cr-Fe in 3.5 wt% NaCl solution.

Fig. 4. Complex plane plots of the EIS for pure Al and Al-Cr-Fe (symbols indicate experimental results and solid lines approximated data obtained using the double-CPE model).

Fig. 5. Equivalent circuit for EIS data fitting (Rsol, Rp, Rc are the bulk solution, pore and charge-transfer resistance, respectively. Cfil and Cd are constant phase elements. W10 is Warburg impedance).

Table 2 EIS data obtained by equivalent electrical circuit models

Sample	R_sol (Ω ? cm²)	R_p (Ω ? cm²)	R_c (Ω ? cm²)	C_fil (Ω^-2 ? cm² ? s^-m)	m	C_d (Ω^-2 ? cm² ? s^-n)	n	W10 (Ω ? cm² ? s^-0.5)
Pure Al	2.40	2.58 × 10⁴	1.3 × 10⁶	8.99 × 10^-6	0.93	1.45 × 10^-4	0.78	5059
Al-Cr-Fe	11.95	3.55 × 10⁴	8.4 × 10⁴	2.35 × 10^-5	0.95	4.34 × 10^-4	0.92	4933

Fig. 6. Potentiodynamic polarization curves of pure Al and Al-Cr-Fe.

Table 3 Data obtained from the potentiodynamic polarization curves of pure Al and Al-Cr-Fe

Sample	β_a (mV/decade)	β_c (mV/decade)	E_corr (mV)	I_corr (μA ? cm^-2)	Source
Pure Al	680	151	-1040	0.32	This study
Al-Cr-Fe	118	158	-938	1.77	This study
316 Stainless steel	-	-	-208	1.7	Li and Bell^[27]
AISI 440C stainless steel	-	-	-485	15.0	Lo et al.^[28]
AISI H13 tool steel	48.3	676	-440	15.53	Yoo et al.^[29]

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