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循环伏安法结合原位拉曼光谱的表征结果表明,烟酸在铁钝化膜层表面的吸附行为归因于其具有形成稳定膜层复合物的性能,烟酸将间隙离子FeⅡ转化为稳定的晶格离子FeⅢ,从而降低铁钝化膜的溶解性.旋转电极电化学晶体微天平的分析结果表明烟酸在活化态和钝化态铁表面的吸附行为遵循Langmuir-Freundlich热力学规律,并由此计算出过程中的吸附常数、标准自由能和非均质分布常数.研究认为有机分子在钝化膜表面为化学型吸附,可导致钝化膜破坏的间隙离子被烟酸固定在八面体空位晶格中形成稳定晶型结构,并通过扫描电镜(SEM)和衰减全反射红外光谱(ATRFTIR)分析对结论进行了再次验证.
Cyclic voltammetry combined with in situ Raman spectroscopy showed that the adsorption behavior of nicotinic acid on the surface of the iron passivation film was attributed to its ability to form a stable layer complex. Nicotinic acid converted the interstitial ion Fe II to a stable Of the lattice ions Fe Ⅲ, thereby reducing the solubility of the iron passivation film.Analysis of the rotating electrode electrochemical crystal microbalance results show that nicotinic acid in the activation state and passive state of the iron surface adsorption behavior follows the Langmuir-Freundlich thermodynamic laws, and by The calculated adsorption constants, standard free energies and heterogeneous distribution constants were calculated.The adsorption of organic molecules on the surface of passivation film was considered as chemical adsorption, and the interstitial ions that caused the destruction of passivation film could be fixed by niacin in octahedral vacancies The crystal lattice formed a stable crystalline structure and the results were re-verified by scanning electron microscopy (SEM) and attenuated total reflection infrared spectroscopy (ATRFTIR).