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测定了 PMTA、MBO、MBI的普通拉曼光谱 ( NRS) ,利用表面增强拉曼散射光谱( SERS)研究了几种唑系缓蚀剂防止银器文物变色的表面成膜过程 ,复合缓蚀剂组分与银的相互作用 ,并讨论了其防变色作用的机理。实验结果表明 ,PMTA、MBI和 MBO与银表面存在着较强的相互作用 ,由于杂环结构的差异 ,不同缓蚀剂在银表面上呈现不同的吸附取向 ,形成了更为致密的防变色保护膜。在成膜溶液中 ,p H值较小时有利于缓蚀剂吸附 ,处理时间应不少于 1 2 0 min。成膜溶液和含缓蚀剂的硫化钠溶液中 ,银电极阴极极化时 (外加阴极电位≤ 60 0 m V的测试范围内 ) ,复合缓蚀剂的 SERS响应均随电位负移而增强 ,表明其可有效防止银在腐蚀介质中的变色行为
The common Raman spectra (NRS) of PMTA, MBO and MBI were measured. Surface-enhanced deposition of several azole-based corrosion inhibitors to prevent discoloration of silver artifacts was studied by surface enhanced Raman scattering spectroscopy (SERS) Components and silver interaction, and discussed the role of anti-discoloration mechanism. The experimental results show that PMTA, MBI and MBO have a strong interaction with the silver surface. Due to the difference of heterocyclic structure, different corrosion inhibitors show different adsorption orientations on the silver surface, forming a more compact color protection against discoloration membrane. In the film-forming solution, p H value is favorable for inhibitor adsorption, the processing time should not be less than 120 min. In the film-forming solution and the sodium sulfide solution containing inhibitor, the SERS response of the composite corrosion inhibitor increases with negative potential when the silver electrode is cathodically polarized (plus the cathodic potential of 60 0 mV or less) Show that it can effectively prevent the discoloration of silver in the corrosive medium