通过建立基于Temkin等温方程的分段吸附模型，分析研究在3%HCl溶液中，不同浓度的磺胺甲恶唑和替硝唑作为缓蚀剂在45 钢表面的吸附行为，论证磺胺甲恶唑和替硝唑的缓蚀性能随浓度增加先增大后降低的现象。由该模型所得吸附参数表明：磺胺甲恶唑和替硝唑在低浓度范围内的吸附性能要优于高浓度范围内的吸附性能，研究表明，发生这种现象的主要原因是在高浓度范围内缓蚀剂分子间疏水引力的作用强于静电斥力，发生疏水聚集，导致其在45 钢表面的吸附性能下降。

The adsorption behavior of different concentrations of sulfamethoxazole and tinidazole on 45 steel surface is analyzed by establishing a Temikin isotherm equation-based segmentation adsorption model, when they are used as corrosion inhibitors in 3% HCl solution. Adsorption parameters obtained by the model show their corrosion inhibiting performance increase first and then decrease as their concentrations increase. And the main reason is the intermolecular hydrophobic attractive force in high concentration range of inhibitor is stronger than the electrostatic repulsion, and then hydrophobic aggregation happens, resulting in the decrease of adsorption performance on the surface of 45 steel.

国家自然科学基金资助项目（51102288）；重庆市教委自然科学基金项目（KJ111420）；重庆科技学院基金项目（CK2011Z06）