Some Aspects of Corrosion Properties of Bioactive Coatings

会议论文
发表日期：

2024年

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K. V. Nadaraia,
D. V. Mashtalyar,
M. A. Piatkova,
A. I. Pleshkova,
I. M. Imshinetskiy,
M. S. Gerasimenko,
I. V. Manzhulo,
A. I. Ponomarenko,
S. L. Sinebryukhov,
S. V. Gnedenkov

摘要

In the presented study, the corrosion properties of bioactive coatings formed by plasma electrolytic oxidation (PEO) on a MA8 magnesium alloy was studied. Using XRD analysis, it was established that the composition of the coatings includes hydroxyapatite. The presence of this substance significantly increases the biocompatibility of the implant material, since this compound is the main mineral component of bone tissue. Hanks’ solution, which is close to human blood plasma, was used as a corrosive medium for electrochemical studies. The results of the analysis of corrosion of samples without coating and with PEO coating made it possible to establish that the application of a ceramic-like layer reduces the corrosion current density and increases the polarization resistance. Additionally, it was found that applying a protective coating increases the corrosion potential of the samples. This increase in protective properties is due to the creation of a poorly soluble barrier layer between the substrate material and the electrolyte, which, in turn, reduces the likelihood of charge transfer at the electrode/electrolyte interface. Thus, PEO coatings formed on magnesium alloys, in addition to having bioactive properties, can reduce the rate of electrochemical dissolution of the implantation material.