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首页> 外文期刊>Applied Surface Science >Adsorption behavior of glycidoxypropyl-trimethoxy-silane on titanium alloy Ti-6.5Al-1Mo-1V-2Zr
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Adsorption behavior of glycidoxypropyl-trimethoxy-silane on titanium alloy Ti-6.5Al-1Mo-1V-2Zr

机译：环氧丙氧基丙基三甲氧基硅烷在钛合金Ti-6.5Al-1Mo-1V-2Zr上的吸附行为

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摘要

The adsorption behavior of glycidoxypropyl-trimethoxy-silane (GTMS) on titanium alloy Ti-6.5Al-1Mo-1V-2Zr was investigated by using X-ray photoelectron spectroscopy (XPS), Tafel polarization test, and electrochemical impedance spectroscopy (EIS). From the XPS results, it was found that the silane coverage on the titanium surface generally increased with GTMS concentration, with a slight decrease at concentration of 0.1%. Based on the relationship between isoelectronic point (IEP) of titanium surface and the pH values of silane solutions, adsorption mechanisms at different concentrations were proposed. The surface coverage data of GTMS on titanium surface was also derived from electrochemical measurements. By linear fitting the coverage data, it revealed that the adsorption of GTMS on the titanium alloy surface at 30 ℃ was of a physisorption-based mechanism, and obeyed Langmuir adsorption isotherm. The adsorption equilibrium constant (K_(ads)) and free energy of adsorption process (ΔG_(ads)) were calculated to elaborate the mechanism of GTMS adsorption.
机译：利用X射线光电子能谱（XPS），Tafel极化试验和电化学阻抗谱（EIS）研究了环氧丙氧基丙基三甲氧基硅烷（GTMS）在钛合金Ti-6.5Al-1Mo-1V-2Zr上的吸附行为。根据XPS结果，发现钛表面上的硅烷覆盖率通常随GTMS浓度的增加而增加，浓度为0.1％时略有下降。根据钛表面的等电点（IEP）与硅烷溶液的pH值之间的关系，提出了不同浓度下的吸附机理。 GTMS在钛表面的表面覆盖率数据也来自电化学测量。通过对覆盖率数据进行线性拟合，发现在30℃时，GTMS在钛合金表面的吸附是基于物理吸附的机理，并且服从Langmuir吸附等温线。计算了吸附平衡常数（K_（ads））和吸附过程的自由能（ΔG_（ads）），以阐明GTMS的吸附机理。

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