Abstract
In this study, we report an effective approach, pre-solid solution (SS) treatment, to reduce the in-vitro bio-degradation rate of the hydrothermal-synthesizing coated Mg–2Zn–Mn–Ca–Ce alloy in Hanks’ solution. Pre-SS treatment alters the microstructure of alloys, which benefits the corrosion resistances of the substrate itself and the formed coating as well. The micro-galvanic corrosion between the secondary phase (cathode) and the α-Mg phase (anode) is relieved due to the reduction of the secondary phase. Meanwhile, coating formed on the SS-treated alloy was compacter than that on as-cast alloy, which provides better protection against initial corrosion.
Highlights
During the recent decades, Mg and its alloys have been widely studied due to its great potential in structural applications and human implant material [1,2,3,4,5,6,7,8,9,10]
The hydrothermal synthesis processing was executed in stainless steel autoclave with a Teflon container (100 mL)
Before the potentiodynamic polarization (PDP) and electrochemical impendence spectroscopy (EIS) test, the samples were pre-immersed in the immersion tests and were connected by the copper wire for electrochemical tests
Summary
Mg and its alloys have been widely studied due to its great potential in structural applications and human implant material [1,2,3,4,5,6,7,8,9,10]. It is of great practical significance to reduce the bio-degradation rate of Mg implants in order to prolong their service life Various methods, such as alloying [11,12,13,14,15], heat treatment [16,17], plastic deformation [18,19,20,21,22], and surface treatment [23,24,25,26,27] have been employed to improve corrosion resistance of Mg implants. In our work, a novel kind of Mg–2Zn–Mn–Ca–Ce alloy was designed and fabricated [28] It exhibited an improved corrosion resistance, while its bio-degradation rate was still not up to medical standards. The SS-treatment benefits both the protective efficiency of the coating and the corrosion resistance of the substrate, leading to further reduction in bio-degradation than before
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