Abstract
The main aim of the present study was to determine the impact of Zn on the surface structure and corrosion behavior of Mg-based metallic glasses after immersion in Ringer’s solution. The corrosion rate expressed by the volume of released hydrogen in the form of a function of immersion time in Ringer’s solution at 37 °C was presented. The surface structure and corrosion products, which were formed during the immersion tests, were examined by means of scanning electron microscopy and the following spectroscopic methods: x-ray photoelectron spectroscopy, x-ray diffractometry, secondary ion mass spectrometry and energy-dispersive x-ray spectroscopy. As a result of the investigations of the surface structure, oxides (MgO, CaO, ZnO), hydroxides (Mg(OH)2, Ca(OH)2) and carbonates (CaCO3) were identified. The analysis of the research results allowed the determination of a probable course and corrosion mechanism of the above-mentioned metallic glasses during immersion in Ringer’s solution.
Highlights
There has been an increasing interest in magnesium alloys as a material for resorbable short-term medical implants
One of the major issues connected with the concept of implants is a high quantity and intensity of hydrogen released during the corrosion process of magnesium alloys, which is too high and harmful to the human body
The surface investigations after immersion tests for Mg64Zn32Ca4 and Mg68Zn28Ca4 metallic glasses were performed to determine the impact of Zn concentration on the surface structure and the course of corrosion process in RingerÕs solution
Summary
There has been an increasing interest in magnesium alloys as a material for resorbable short-term medical implants. A new concept of resorbable, orthopedic implants assumes that this new material with biocompatible elements will be resorbed after concrescence of the bone by the human body This new concept is based on the combination of three factors: good bearing capacity of the implant (in accordance with sufficiently high mechanical strength), stable implant geometry (invariable during concrescence of the bone) and a controllable corrosion rate (dissolution rate). One of the major issues connected with the concept of implants is a high quantity and intensity of hydrogen released during the corrosion process of magnesium alloys, which is too high and harmful to the human body. The surface investigations after immersion tests for Mg64Zn32Ca4 and Mg68Zn28Ca4 metallic glasses were performed to determine the impact of Zn concentration on the surface structure and the course of corrosion process in RingerÕs solution
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