Effect of etching on the composition and structure of anodic spark deposition films on titanium
Effect of etching on the composition and structure of anodic spark deposition films on titanium
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DOI：
10.1016/j.matdes.2016.06.088
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发表时间：
2016-10-15
影响因子：
8.4
通讯作者：
Chiesa, R.
中科院分区：
文献类型：
--
作者：
Marin, E.;Diamanti, M. V.;Chiesa, R.
阳极电火花沉积在生物医学应用中作为钛的涂层处理特别广泛，因为它可以提高钛及其合金的耐久性和生物相容性。这项工作提出了一种分析不同的表面处理钛，其中表面蚀刻在HF阳极氧化前和最后碱蚀刻的阳极氧化物被选为可能的方法来改变表面粗糙度，晶体结构和化学成分。在两种不同的电压下进行阳极氧化以产生不同的形貌和晶相。在较高的电压下获得更大和更规则的孔隙率，同时形成钛酸钠。而HF预处理只影响表面粗糙度，但不影响表面化学，NaOH后处理促进了Na2TiO3的形成，特别是在高电压形成的氧化物。这被确定为更大的自由基物质存在的原因，其修改表面生物活性，并负责在以前的生物学研究中报告的治疗的抑菌效果。(C)2016爱思唯尔有限公司版权所有。
Anodic spark deposition is particularly spread as coating treatment of titanium in biomedical applications, as it allows to improve both durability and biocompatibility of titanium and its alloys. This work proposes an analysis of different surface treatments on titanium, where surface etching in HF prior to anodizing and final alkali etching of the anodic oxide are chosen as possible methods to alter surface roughness, crystal structure and chemical composition. Anodizing was performed at two different voltages to produce different morphologies and crystal phases. Larger and more regular porosity was obtained at higher voltages, together with the formation of sodium titanates. While the HF pre-treatment only affected surface roughness but not surface chemistry, the NaOH post treatment promoted the formation of Na2TiO3 especially on high voltage formed oxides. This was identified as the cause for a larger presence of radical species, which modify surface bioactivity and is responsible for a bacteriostatic effect of the treatments reported in previous biological studies. (C) 2016 Elsevier Ltd. All rights reserved.