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Volume 16 Issue 4
Aug.  2009
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Hong Zhang, Xiao-gang Li, Cui-wei Du,  and Hui-bin Qi, Corrosion behavior and mechanism of the automotive hot-dip galvanized steel with alkaline mud adhesion, Int. J. Miner. Metall. Mater., 16(2009), No. 4, pp. 414-421. https://doi.org/10.1016/S1674-4799(09)60073-X
Cite this article as:
Hong Zhang, Xiao-gang Li, Cui-wei Du,  and Hui-bin Qi, Corrosion behavior and mechanism of the automotive hot-dip galvanized steel with alkaline mud adhesion, Int. J. Miner. Metall. Mater., 16(2009), No. 4, pp. 414-421. https://doi.org/10.1016/S1674-4799(09)60073-X
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Materials

Corrosion behavior and mechanism of the automotive hot-dip galvanized steel with alkaline mud adhesion

  • 通讯作者:

    Hong Zhang    E-mail: hongzhang0523@163.com

  • The corrosion behavior and mechanism of hot-dip galvanized steel and interstitial-free (IF) substrate with alkaline mud adhesion were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear polarization. The results show that non-uniform corrosion occurs on the galvanized steel and IF substrate during 250 h with the mud adhesion. The corrosion products on the galvanized steel are very loose and porous, which are mainly ZnO, Zn5(OH)8C12·H2O and Zn(OH)2, and Fe-Zn alloy layer with a lower corrosion rate is exposed on the galvanized steel surface; however, the corrosion products on IF substrate are considerably harder and denser, whose compositions of rust are mainly FeOOH and Fe3O4, and several pits appear on their surface. The results of continuous EIS and linear polarization measurements exhibit a corrosion mechanism, that is, under activation control, the charge transfer resistances present different tendencies between the galvanized steel and IF substrate; in addition, the evolution of linear polarization resistances is similar to that of charge transfer resistances. The higher contents of dissolved oxygen and Cl- ions in the mud play an important role in accelerating the corrosion.
  • Materials

    Corrosion behavior and mechanism of the automotive hot-dip galvanized steel with alkaline mud adhesion

    + Author Affiliations
    • The corrosion behavior and mechanism of hot-dip galvanized steel and interstitial-free (IF) substrate with alkaline mud adhesion were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear polarization. The results show that non-uniform corrosion occurs on the galvanized steel and IF substrate during 250 h with the mud adhesion. The corrosion products on the galvanized steel are very loose and porous, which are mainly ZnO, Zn5(OH)8C12·H2O and Zn(OH)2, and Fe-Zn alloy layer with a lower corrosion rate is exposed on the galvanized steel surface; however, the corrosion products on IF substrate are considerably harder and denser, whose compositions of rust are mainly FeOOH and Fe3O4, and several pits appear on their surface. The results of continuous EIS and linear polarization measurements exhibit a corrosion mechanism, that is, under activation control, the charge transfer resistances present different tendencies between the galvanized steel and IF substrate; in addition, the evolution of linear polarization resistances is similar to that of charge transfer resistances. The higher contents of dissolved oxygen and Cl- ions in the mud play an important role in accelerating the corrosion.
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