Influence of cerium content on the corrosion behavior of Al-Co-Ce amorphous alloys in 0.6 M NaCl solution

doi:10.1016/j.jmst.2019.03.014

Abstract

Abstract:

The effect of cerium content on the corrosion behavior of Al-Co-Ce amorphous alloys in 0.6 M NaCl solution was investigated by cyclic polarization, Mott-Schottky and X-ray photoelectron spectroscopy techniques. Results indicated that the open circuit potential of Al-Co-Ce amorphous alloys displayed a decreased tendency with the increase in Ce content, and the amorphous alloy with 4 at.% Ce presented both the lowest passive current density and donor density indicating the best corrosion resistance, while adding excess Ce led to the reduced corrosion resistance of Al-Co-Ce alloys. Furthermore, it was found that a low Ce content is beneficial to the formation of a more protective passive film on Al-Co-Ce amorphous alloys, and the corrosion inhibition reactions of Al-Co-Ce alloys in 0.6 M NaCl solution were changed with the increase in Ce content and the detailed reasons were discussed.

Key words: Amorphous materials, Polarization, Corrosion, Photoelectron spectroscopies

L.M. Zhang, S.D. Zhang, A.L. Ma, A.J. Umoh, H.X. Hu, Y.G. Zheng, B.J. Yang, J.Q. Wang. Influence of cerium content on the corrosion behavior of Al-Co-Ce amorphous alloys in 0.6 M NaCl solution[J]. J. Mater. Sci. Technol., 2019, 35(7): 1378-1387.

Figures/Tables 14

Fig. 1. The composition-structure map [7,14] of Al-Co-Ce based on at.% Co and at.% Ce present in solid solution Al (the selected composition region in this paper was surrounded by red dashed line and red star denotes the composition with the best GFA based on cluster stability lines model).

Fig. 2. (a) XRD patterns of Al93-xCo7Cex (x = 3, 4, 5, 6, 7) melt-spun ribbons prepared with 35 m/s circumferential wheel speed, (b) the bright-field TEM image and the selected area electronic diffraction pattern (SEAD, inset) of the Al90Co7Ce3 melt-spun ribbon.

Table 1 Nominal composition and the actual composition of Al93-xCo7Cex (x = 3, 4, 5, 6, 7) melt-spun ribbons.

Nominal composition(at.%)	Al₉₀Co₇Ce₃	Al₈₉Co₇Ce₄	Al₈₈Co₇Ce₅	Al₈₇Co₇Ce₆	Al₈₆Co₇Ce₇
Actual composition(at.%)	Al_90.01Co_6.91Ce_3.08	Al_88.73Co_7.19Ce_4.08	Al_87.51Co_7.26Ce_5.23	Al_87.22Co_6.81Ce_5.97	Al_85.90Co_7.08Ce_7.02

Fig. 3. (a) The OCP curves of Al93-xCo7Cex (x = 3, 4, 5, 6, 7) amorphous alloys in 0.6 M NaCl solution for 3600 s, (b) the statistical results of stable OCP derived from six repeated tests for Al93-xCo7Cex (x = 3, 4, 5, 6, 7) amorphous alloys.

Fig. 4. Cyclic polarization curves of Al93-xCo7Cex (x = 3, 4, 5, 6, 7) amorphous alloys in 0.6 M NaCl solution (the arrows indicating the scanning direction).

Fig. 5. Statistical results of ipass, Epit, Erp, Ecorr derived from six repeated tests of cyclic polarization curves of Al93-xCo7Cex (x = 3, 4, 5, 6, 7) amorphous alloys.

Fig. 6. Capacitance plots of Al93-xCo7Cex (x = 3, 4, 5, 6, 7) amorphous alloys with the change of frequency in 0.6 M NaCl solution.

Fig. 7. (a) Mott-Schottky plots of five kinds of Al-Co-Ce amorphous alloys in 0.6 M NaCl solution, (b) donor densities of passive films of Al93-xCo7Cex (x = 3, 4, 5, 6, 7) amorphous alloys.

Fig. 8. XPS full spectra of the passive films of Al89Co7Ce4 and Al86Co7Ce7 amorphous alloys after immersion in 0.6 M NaCl for four days.

Fig. 9. XPS spectra of (a) Al 2p, (b) Co 2p3/2, (c) Ce 3d5/2 for the passive films of Al89Co7Ce4 amorphous alloy after immersion in 0.6 M NaCl for four days, (d) the relative content of each substance.

Fig. 10. XPS spectra of (a) Al 2p, (b) Co 2p3/2, (c) Ce 3d5/2 for the passive films of Al86Co7Ce7 amorphous alloy after immersion in 0.6 M NaCl for four days, (d) the relative content of each substance.

Fig. 11. Depth profiles of Al, Co, Ce, O and Cl in the passive films formed on (a) Al89Co7Ce4 and (b) Al86Co7Ce7 amorphous alloys after immersion in 0.6 M NaCl solution for four hours. (c) and (d) are the depth profiles of Al, Co, Ce, O in the passive films formed on Al89Co7Ce4 and Al86Co7Ce7 amorphous alloys after immersion in 0.6 M NaCl for four days, respectively.

Fig. 12. Corrosion morphologies (cross sections) of (a) Al89Co7Ce4 and (b) Al86Co7Ce7 amorphous alloys after immersion in 0.6 M NaCl solution for four days.

Fig. 13. The impact schematic of Ce content on OCP of Al-Co-Ce amorphous alloys in 0.6 M NaCl solution.

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