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通过等离子体电解氧化结合火焰喷涂在镁合金上制备的MgO/羟基磷灰石双层涂层的微观结构与腐蚀特性

Microstructure and Corrosion Characterization of a MgO/Hydroxyapatite Bilayer Coating by Plasma Electrolytic Oxidation Coupled with Flame Spraying on a Mg Alloy.

作者信息

Mardali Marzieh, Salimijazi Hamidreza, Karimzadeh Fathallah, Blawert Carsten, Luthringer-Feyerabend Bérengère J C, Fazel Mohammad, Safarbali Babak

机构信息

Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht 21502, Germany.

Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.

出版信息

ACS Omega. 2020 Sep 18;5(38):24186-24194. doi: 10.1021/acsomega.0c01574. eCollection 2020 Sep 29.

DOI:10.1021/acsomega.0c01574
PMID:33015434
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7528172/
Abstract

Thermally sprayed hydroxyapatite coatings are one of the main strategies to improve the bioactivation of metal implants. However, the naturally low corrosion resistance of these coatings is the main challenge for their use. In this study, plasma electrolytic oxidation (PEO) was used to create an intermediate layer. The anodization process was used for comparison. According to the polarization curves, the PEO layer was more effective than the anodized layer in reducing the corrosion current density ( of 0.05 × 10 A/cm vs of 0.05 A/cm). The results of electrochemical impedance spectroscopy showed higher resistance of the sample with a PEO interlayer than that of the sample with an anodized interlayer. The results of the hydrogen evolution test revealed that the PEO layer as a middle layer served as the main barrier for reducing the magnesium corrosion rate, especially during the initial immersion time.

摘要

热喷涂羟基磷灰石涂层是改善金属植入物生物活性的主要策略之一。然而，这些涂层天然的低耐腐蚀性是其应用的主要挑战。在本研究中，采用等离子体电解氧化（PEO）来制备中间层。采用阳极氧化工艺作为对照。根据极化曲线，PEO层在降低腐蚀电流密度方面比阳极氧化层更有效（0.05×10⁻⁶A/cm²对0.05 A/cm²）。电化学阻抗谱结果表明，具有PEO中间层的样品比具有阳极氧化中间层的样品具有更高的电阻。析氢试验结果表明，PEO层作为中间层是降低镁腐蚀速率的主要屏障，尤其是在初始浸泡时间内。

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