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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Electrochemical behavior of different preparations of plasma-sprayed hydroxyapatite coatings on Ti6Al4V substrate
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Electrochemical behavior of different preparations of plasma-sprayed hydroxyapatite coatings on Ti6Al4V substrate

机译：Ti6Al4V基体上等离子喷涂羟基磷灰石涂层制备的电化学行为

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摘要

The corrosion behavior of four different preparations of plasma-sprayed hydroxyapatite (HA) coatings on Ti6Al4V substrates in static Hank's balanced salt solution was investigated using dc potentiodynamic and ac impedance techniques. Two different nominal thicknesses, 50 mu m and 200 mu m, and two different spraying conditions, were considered. The electrochemical impedance experiments proved this technique to be very suitable for the investigation of the electrochemical behavior of surgical implant alloys when they are coated with HA, which is characterized by the dissolution and passivation characteristics of the underlying metal substrate. Because the coatings are porous, ionic paths between the electrolytic medium and the base material can eventually be produced, resulting in the corrosion of the coated metal. Differences in the corrosion resistance of the coated materials were detected, and a relevant model for the description of the coating degradation in the biosimulating solution was proposed. The model consisted of the description of the coated system in terms of a two-layer model of the surface film. Significant differences in electrochemical behavior for similar nominal thicknesses of HA coatings obtained under different spraying conditions were found.
机译：使用直流电势和交流阻抗技术研究了四种不同制备的等离子喷涂羟基磷灰石（HA）涂层在静态Hank平衡盐溶液中在Ti6Al4V基底上的腐蚀行为。考虑了两种不同的标称厚度（50微米和200微米）以及两种不同的喷涂条件。电化学阻抗实验证明，该技术非常适合研究用HA涂层的外科植入物合金的电化学行为，其特征在于下层金属基材的溶解和钝化特性。因为涂层是多孔的，所以最终可以在电解介质和基础材料之间产生离子路径，从而导致涂层金属的腐蚀。检测了涂层材料的耐腐蚀性的差异，并提出了用于描述生物模拟溶液中涂层降解的相关模型。该模型由两层表面膜模型对涂层系统的描述组成。发现在不同喷涂条件下获得的HA标称厚度相似的标称厚度的电化学行为存在显着差异。

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