Corrosion resistance of the biodegradable ZE41 magnesium alloy treated by unconventional fluoride conversion coating

Q3 Materials Science

Koroze a ochrana materialu Pub Date : 2019-12-01 DOI:10.2478/kom-2019-0018

J. Drábiková, S. Fintová, P. Doležal, J. Wasserbauer, Z. Florková

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Abstract

Abstract Magnesium based alloys are very promising material to be used mainly for biodegradable implants in medical applications. However, due to their very low corrosion resistance in the environment of in vivo is their use limited. Increase of the corrosion resistance of magnesium alloys in vivo can be achieved, for example, by a suitable choice of surface treatment while the biocompatibility must be ensured. Fluoride conversion coatings meet these requirements. Unconventional fluoride conversion coating was prepared on ZE41 magnesium alloy by dipping the magnesium alloy into the Na[BF4] salt melt at 450 °C for 0.5; 2 and 8 h. The morphology and thickness of the prepared fluoride conversion coatings were investigated as well as the corrosion resistance of the treated and untreated ZE41 magnesium alloy specimens. The corrosion resistance of the untreated and treated ZE41 magnesium alloy was investigated using electrochemical impedance spectroscopy in the environment of the simulated body fluids at 37 ± 2 °C. The obtained results showed a positive influence of the fluoride conversion coating on the corrosion resistance of the ZE41 magnesium alloy.

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非常规氟化物转化涂层处理生物可降解ZE41镁合金的耐蚀性

摘要镁基合金是一种非常有前途的材料，主要用于医疗应用中的可生物降解植入物。然而，由于其在体内环境中的耐腐蚀性非常低，因此其使用受到限制。例如，在确保生物相容性的同时，可以通过适当选择表面处理来提高镁合金在体内的耐腐蚀性。氟化物转化涂料满足这些要求。在ZE41镁合金上，通过将镁合金在450°C的Na[BF4]盐熔体中浸渍0.5，制备了非常规的氟化物转化涂层；2和8h。研究了所制备的氟化物转化涂层的形态和厚度，以及处理和未处理的ZE41镁合金试样的耐腐蚀性。在37±2°C的模拟体液环境中，使用电化学阻抗谱研究了未处理和处理的ZE41镁合金的耐腐蚀性。结果表明，氟转化涂层对ZE41镁合金的耐腐蚀性有积极影响。

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