Abstract
The aim of this work was to monitor the corrosion rate of the Mg72Zn24Ca4 and Zn87Mg9Ca4 alloys. The purity of the alloying elements was 99.9%. The melt process was carried out in an induction furnace. The melting process took place under the cover of an inert gas (argon). The copper form was flooded by liquid alloy. Then, in order to obtain ribbons, the cast alloy, in rod shape, was re-melted on the melt spinning machine. The corrosion resistance of both alloys has been determined on the basis of the following experiments: measurements of the evolution of OCP (open circuit potential), LSV (linear sweep voltamperometry) and EIS (electrochemical impedance spectroscopy). All corrosion tests were carried out in Ringer’s solution at 37 °C and pH 7.2. The corrosion tests have revealed that the zinc alloy, Zn87Mg9Ca4, exhibits significantly higher corrosion resistance in the Ringer solution compared to the magnesium alloy, Mg72Zn24Ca4. Moreover, it has been shown that the cathodic reaction proceeds faster on the surface of ribbons. EIS measurements show that the dissolution of Mg alloy proceeds with two steps: transfer of Mg2+ ions to the Ringer solution and then the formation of the corrosion products, which are deposited on the surface of magnesium alloy. It has been revealed, too, that for both bulk materials, diffusion of chloride ions through the corrosion product’s layer takes place.
Highlights
Biodegradable metals in recent years have attracted considerable attention as potential orthopedic implants
Due to very good biodegradability, biocompatibility and non-toxicity, magnesium and its alloys are widely used in the biomedical sector [14]
Large amounts of Mg2+ are present in the human body. These ions participate in many metabolic reactions, biological mechanisms, and their excess is excreted via urine [15]
Summary
Biodegradable metals in recent years have attracted considerable attention as potential orthopedic implants. Mg and its alloys [1,2,3,4,5] including Mg-Ca [6], Mg-RE [7,8], Mg-Sr [9], Mg-Zn [10,11] and. Due to very good biodegradability, biocompatibility and non-toxicity, magnesium and its alloys are widely used in the biomedical sector [14]. Large amounts of Mg2+ are present in the human body. These ions participate in many metabolic reactions, biological mechanisms, and their excess is excreted via urine [15]. The human body has an inborn tolerance for the absorption of magnesium, zinc and calcium
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