Investigation of hydroxyapatite (HAP) containing coating on grade 2 titanium alloy prepared by plasma electrolytic oxidation (PEO) at low voltage

等离子体电解氧化 材料科学 腐蚀 扫描电子显微镜 介电谱 涂层 电解质 冶金 合金 氧化物 钛合金 电化学 极化(电化学) 模拟体液 化学工程 复合材料 电极 化学 物理化学 工程类
作者
Lorena Kostelac,Luca Pezzato,Alessio Giorgio Settimi,Mattia Franceschi,Claudio Gennari,Katya Brunelli,Chiara Rampazzo,Manuele Dabalà
出处
期刊:Surfaces and Interfaces [Elsevier BV]
卷期号:30: 101888-101888 被引量:20
标识
DOI:10.1016/j.surfin.2022.101888
摘要

In this work, plasma electrolytic oxidation (PEO) process was used to produce bioactive coatings, mainly composed by hydroxyapatite (Hap) and titanium oxide, on grade 2 titanium alloy. All PEO treatments were carried out using a maximum voltage of 315 V, a lower value in comparison with the works present in literature, thus resulting a more environmentally friendly process. The effects on the PEO coatings of KOH addition to electrolyte and of working in direct or pulsed current mode, were also investigated. The morphology and elemental composition of the coatings were characterised by scanning electron microscopy (SEM), whereas the phase analysis was carried out with X-ray diffraction (XRD). The corrosion resistance properties were investigated by open circuit potential measuraments, potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) tests. Moreover, cell-adhesion biological tests were performed. SEM analysis evidenced the presence of needle-shape crystals of hydroxyapatite, as confirmed by XRD, that totally or partially filled the pores of PEO layer. The corrosion test showed an improvement in the corrosion behaviour of the PEO coated samples in comparison with the untreated sample. Cell-Adhesion biological tests evidenced excellent cytocompatibility of the coatings with human cells and an improvement in the cell adhesion in comparison with the untreated sample.
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