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用微米和纳米粒度的SiO2粉体分别配制SiO2质量分数为5%、模数(SiO2/Na2O摩尔比)为3.50的硅酸钠溶液,并用之浸泡热镀锌钢制备了硅酸盐钝化膜。用X射线衍射(XRD)、反射红外光谱(RA-IR)分析二氧化硅粉体,用透射红外光谱(FT-IR)和核磁共振(NMR)分析硅酸钠溶液的结构,用原子力显微镜(AFM)、电化学阻抗谱(EIS)分析转化膜的结构。结果表明:与微米级二氧化硅相比,纳米级二氧化硅含有Si-OH键较多,用它配制的硅酸钠溶液中硅酸负离子的聚合程度较低,成膜过程脱水量较多而生成微观孔隙较多的转化膜。
Silicate passivation films were prepared by immersing hot-dip galvanized steel with 5% SiO2 and 3.50 SiO2 / Na2O molar ratio respectively with micron and nano-sized SiO2 powders. . The silica powder was analyzed by X-ray diffraction (XRD) and reflection infrared spectroscopy (RA-IR). The structure of sodium silicate solution was analyzed by transmission infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR) AFM), electrochemical impedance spectroscopy (EIS) analysis of the structure of the conversion membrane. The results show that compared with the micron silica, the nano-silica contains more Si-OH bonds, the sodium silicate solution prepared by it has a lower degree of polymerization of silicic acid anions and more dehydration in the film formation process And generate more microscopic pores of the conversion film.