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应用电化学阻抗谱(EIS)技术,结合扫描电镜(SEM)、能量散射X射线谱(EDS)、X射线光电子能谱(XPS)、扫描探针显微镜(SPM)等表面分析技术,研究了镀锡薄钢板在功能饮料中的腐蚀过程并探讨了腐蚀机制.结果表明:浸泡前期,EIS低频阻抗模值的增加与前31h镀锡薄钢板表面形成的腐蚀产物膜有关;随着浸泡时间的增加,EIS低频阻抗模值有所下降,这与腐蚀产物膜的部分脱落以及暴露的基底金属碳钢的腐蚀有关.镀锡薄钢板在功能饮料中浸泡24天后其表面的腐蚀产物膜由外层的富锡层和内层的富铁层组成,XPS结果表明其成分主要是Sn(Ⅱ)/Sn(Ⅳ)与柠檬酸阴离子及Fe(Ⅲ)与柠檬酸阴离子组成的化合物,其腐蚀类型主要是功能饮料中的有机酸对镀锡薄钢板的腐蚀.
Electrochemical impedance spectroscopy (EIS) and surface analysis techniques such as scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and scanning probe microscopy (SPM) The results show that the increase of the low frequency impedance of EIS is related to the corrosion product film formed on the surface of the tinplate in the first 31h; with the increase of immersion time , EIS low frequency impedance modulus decreased, which is part of the corrosion products and the film off the exposed carbon steel substrate corrosion.The tinplate after immersion in functional drinks for 24 days after the surface of the corrosion product film from the outer layer Rich tin layer and the inner iron-rich layer. The results of XPS indicated that the main components were Sn (Ⅱ) / Sn (Ⅳ) and citric acid anion and Fe (Ⅲ) and citric acid anion. The corrosion types were mainly Organic acids in functional beverages on the corrosion of tinplate.