Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (01): 121-126.doi: 10.3866/PKU.WHXB201228121

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Corrosion Behavior of Tinplates in a Functional Beverage

XIA Da-Hai1, SONG Shi-Zhe1,2, WANG Ji-Hui1,2, BI Hui-Chao1, HAN Zhe-Wen1   

  1. 1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, P. R. China;
    2. Tianjin Key Laboratory of Composite and Functional Materials, Tianjin 300072, P. R. China
  • Received:2011-09-29 Revised:2011-10-26 Published:2011-12-29
  • Contact: WANG Ji-Hui
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2011CB610500).

Abstract: In this paper, the corrosion process of a tinplate in a functional beverage was investigated using electrochemical impedance spectroscope (EIS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), scanning probe microscopy (SPM), and X-ray photoelectron spectroscopy (XPS), and a corrosion mechanism is proposed. We conclude that an increase in the impedance modulus at low frequency is due to the corrosion product forming on the surface of the tinplate over the first 31 h. With an increase in the immersion time a decrease in the impedance modulus at low frequency is due to the detachment of the corrosion product and the corrosion of the carbon steel substrate. X-ray photoelectron spectroscopy (XPS) results show that the corrosion product is mainly composed of a Sn(II)/Sn(IV) citrate complex or an Fe(III) citrate complex. Furthermore, the corrosion product film is first enriched with Sn and then enriched with Fe after immersion in functional beverage for 24 d. We propose that the tinplate is mainly corroded by the organic acids that exist in functional beverages.

Key words: Tinplate, Functional beverage, Corrosion mechanism, Electrochemical impedance spectroscope, X-ray photoelectron spectroscopy, Scanning probe microscopy


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