Corrosion Process Detection of Tinplate in Deaerated Functional Beverage by EIS

• Published in: Transactions of Tianjin University Vol. 19; no. 4; pp. 235 - 240
• Main Author: 王吉会 付丛伟 高志明 夏大海
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.08.2013; Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2V4; Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China%Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
• Subjects: EIS; Engineering; Humanities and Social Sciences; Mechanical Engineering; multidisciplinary; Science; 功能饮料; 扫描电子显微镜; 电化学阻抗谱; 脱气; 腐蚀过程; 过程检测; 铁腐蚀; corrosion process; electrochemical impedance spectroscopy; functional beverage; tinplate; deaerated condition
• ISSN: 1006-4982; 1995-8196
• DOI: 10.1007/s12209-013-2007-7

The corrosion process of tinplate in deaerated functional beverage was investigated by using electrochemi- cal impedance spectroscopy （EIS） combined with scanning electron microscopy （SEM） and energy dispersive spec- troscopy （EDS） techniques. The results reveal that the uncoated tinplate shows a poor corrosion resistance and the corrosion type is detinning. During the initial stage of immersion, EIS spectrum consisted of two capacitance arcs with obvious time-constant dispersion effect, which was attributed to the two-dimensional and three-dimensional inhomo- geneous distribution of the electrode surface. With the increase of immersion time, the capacitance arc of high fre- quency shrunk and degenerated, due to the corrosion of tin coating. The pore resistance of tin coating and the charger transfer resistance of substrate, which are determined from the electrochemical equivalent circuit, can be used as the indicators of tinplate corrosion process. The decrease of the pore resistance of tin coating indicates that the corrosion degree of tin layer becomes more severe, whereas the decrease of the charger transfer resistance of substrate implies that the corrosion degree of steel substrate also becomes more severe as the immersion time prolongs.