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首页> 外文期刊>Surface & Coatings Technology >Synthesis, characterization, corrosion and bioactivity investigation of nano-HA coating deposited on biodegradable Mg-Zn-Mn alloy
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Synthesis, characterization, corrosion and bioactivity investigation of nano-HA coating deposited on biodegradable Mg-Zn-Mn alloy

机译：纳米HA涂层沉积在生物降解的Mg-Zn-Mn合金上的纳米HA涂层的合成，表征，腐蚀和生物活性研究

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Electric discharge machining (EDM) is widely used to cut and shape the biomedical device substrates, following often a separate coating process to deposit another barrier layer to improve the corrosion performance. This paper presents an innovative single in-situ surface modification technique to deposit nano-hydroxyapatite (nHA) coating on biodegradable Mg-Zn-Mn alloy while shaping the device substrate via electric discharge machining (EDM). The key benefit of the technique is to carry out the whole process in a single setup, hence saving time and cost. The aim of the coating is to control implant's degradation rate and to improve in-vitro bioactivity with human cells. Morphology, elemental, and chemical composition of the nHA coated Mg-Zn-Mn surface were characterized by FE-SEM, EDS, and XRD, respectively, while microhardness is measured by a Vickers hardness tester. Corrosion tests were performed via potentiodynamic polarization measurements in a SBF (simulated body fluid) to evaluate the degradation kinetics. In-vitro cell culture study was carried out to evaluate biocompatibility and cell attachment onto the modified surface. Surface characterization results revealed that a biomimetic nHA containing interconnected nano-porosities of size 5-10 mu m had been yielded on the substrate surface, which is beneficial for the apatite growth and osseo-integration. The deposited coating layer has comprised of Mg, Zn, Mn, O, Ca and P elements and formed intermetallic oxide phases, such as CaMg, Mg-Zn, Mn-CaO, Mn-P, and Ca-Mn-O, which improved the in-vitro corrosion performance. The degradation rate of Mg-Zn-Mn alloy was reduced by 90.85% from 0.82 mm/year to 0.07 mm/year by the deposition of nHA-coating layer. The microhardness of the modified surface was measured as 234 HV, which was 1.5 fold higher than the untreated surface. The corroded surface analysis showed that the dense intermetallic phases of nHA coating acted as a stable barrier layer, thus prohibiting the surfa
机译：电气放电加工（EDM）广泛用于切割和塑造生物医学装置基板，经常是单独的涂覆工艺以沉积另一个阻挡层以改善腐蚀性。本文介绍了一种创新的单一原位表面改性技术，可通过电放电加工（EDM）在可生物降解的Mg-Zn-Mg-Zn-Mn-Mn合金上沉积纳米羟基磷灰石（NHA）涂层。该技术的主要好处是在单个设置中进行整个过程，从而节省时间和成本。涂层的目的是控制植入物的降解速率并与人细胞改善体外生物活性。 NHA涂覆的Mg-Zn-Mn表面的形态学，元素和化学成分分别通过Fe-SEM，EDS和XRD来表征，而通过维氏硬度测试仪测量显微硬度。通过SBF（模拟体液）中的电位偏振测量进行腐蚀试验以评估降解动力学。进行体外细胞培养研究，以评估生物相容性和细胞附着在改性表面上。表面表征结果显示，在基材表面上产生含有尺寸5-10μm的互连纳米孔隙的生物摩擦NHA，这对于磷灰石生长和综合体是有益的。沉积的涂层包括Mg，Zn，Mn，O，Ca和P元素，形成金属间氧化物相，例如Camg，Mg-Zn，Mn-CaO，Mn-P和Ca-Mn-O.改善体外腐蚀性。通过沉积NHA涂层，Mg-Zn-Mn合金的降解速率从0.82mm /同一年减少了90.85％至0.07mm /倍。将改性表面的显微硬度测量为234 HV，比未处理的表面高1.5倍。腐蚀的表面分析表明，NHA涂层的致密金属间相用作稳定的阻挡层，从而禁止浪潮

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