Corrosion Behavior of MgZnCa Bulk Amorphous Alloys Fabricated by Spark Plasma Sintering

doi:10.1007/s40195-016-0451-9

Abstract

Abstract:

Centimeter-sized Mg₆₅Zn₃₀Ca₅ bulk amorphous alloys were fabricated by the spark plasma sintering process from the amorphous powders with a size smaller than 5 μ m prepared by ball-milling. The sintered Mg₆₅Zn₃₀Ca₅ samples were in an amorphous state when the spark plasma sintering was performed at a temperature of 383 K under a pressure of 600 MPa. The data of polarization curves presented that the sintered Mg₆₅Zn₃₀Ca₅ bulk amorphous alloys exhibited higher corrosion resistance than pure Mg and AZ31B alloy owing to high content of Zn and homogeneous structure. A calcium phosphate compound layer was formed on the sintered Mg₆₅Zn₃₀Ca₅ bulk amorphous sample after immersion in Hanks’ solution, which is effective in improving corrosion resistance and bioactivity. The sintered MgZnCa bulk amorphous alloys with large dimensions broaden the potential application of bulk amorphous alloys in the biomedical fields.

Key words: Mg, Bulk amorphous alloy, sSpark plasma sintering, Corrosion behavior, Biomedical applications

Feng-Xiang Qin,Chuan Ji,Zhen-Hua Dan,Guo-Qiang Xie,Hao Wang,Shin-Ichi Yamaura,Mitsuo Niinomi,Yang-De Li. Corrosion Behavior of MgZnCa Bulk Amorphous Alloys Fabricated by Spark Plasma Sintering[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(9): 793-799.

Figures/Tables 7

Fig. 1 XRD patterns of the ball-milled Mg65Zn30Ca5 powders after different milling times. XRD pattern of the initial crystalline powders is also shown for comparison

Fig. 2 SEM image a and powder size distribution ratio b of Mg65Zn30Ca5 powders ball-milled for 55 h

Fig. 3 XRD patterns of Mg65Zn30Ca5 bulk amorphous alloys spark plasma sintered at various temperatures with a loading pressure of 600 MPa and holding time of 10 min

Fig. 4 SEM morphologies of Mg65Zn30Ca5 bulk amorphous alloys sintered at 383 K a, 403 K b, 423 K c. The white circles mark the voids

Fig. 5 Potentiodynamic polarization curves of Mg65Zn30Ca5 bulk amorphous alloy fabricated by the SPS process at 383 K. The data of high-purity Mg, AZ31B alloy and Mg65Zn30Ca5 amorphous ribbon are also shown for comparison

Fig. 6 XPS peaks of Mg 1sa, Zn 2pb, Ca 2pc, O 1sd, P 2pe in native layer (before immersion) and oxide layer (after immersion in Hanks’ solution) of Mg65Zn30Ca5 bulk amorphous alloys prepared by SPS

Fig. 7 Ratio of cationic element M (Mg, Zn, Ca) in the surface film to the Mg65Zn30Ca5 bulk amorphous alloy ([Mox]/[Mbulk]) after immersion in Hanks’ solution

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