CORROSION BEHAVIOUR OF MAGNESIUM ALLOYS NZ30K AND NZ30K ALLOYED WITH SILVER IN THE MODEL SOLUTION OF THE OSTEOSYNTHESIS PROCESS
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https://doi.org/10.31489/2024No3/29-36Keywords:
bioimplant, magnesium alloy NZ30K alloyed with silver, local corrosion, osteosynthesisAbstract
The corrosion behaviour of magnesium alloys NZ30K and NZ30K alloyed with 0.1 wt.% silver in Ringer's Locke solution has been studied, since their components are not toxic to the human body and do not cause clinical complications in the treatment of bone fractures, and silver has antibacterial properties inherent in antibiotics. It has been found that the Ecor potential of the silver-alloyed NZ30K sample was -1.57V during the first 100 seconds of testing, but then it intensively shifted to the positive side to -1.54V within 512 seconds at a rate of 0.051 mV/s, which decreased to 0.014 mV/s after the next 1000 seconds, and a stationary value of the potential Ecor on the sample has been recorded. The sample to uniform general corrosion has been subjected, and the improvement of its potential Ecor during its corrosion study was due to the most intense selective dissolution of magnesium, which has the most negative value of the standard potential among the alloy components, and the enrichment of its surface with Zn, Nd, Zr, Ag, which have a positive value of the standard potential. This trend contributed to a decrease in the rate of general corrosion and made it impossible to develop local corrosion. The NZ30K alloy alloyed with 0.1 wt.% silver is recommended for further potentiodynamic and volumetric corrosion studies to justify its selection as a structural material for the production of biodegradable implants in osteosynthesis.
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