Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (11): 2618-2624.doi: 10.3866/PKU.WHXB20111109

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Effect of Rare Earth Ce3+ on the Microbial Induced Corrosion Behavior of Aluminum Alloy LY12CZ

ZHAO Yong1, XUE Wen-Bin2, LIU Hong-Fang1   

  1. 1. School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China;
    2. Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875, P. R. China
  • Received:2011-07-05 Revised:2011-08-17 Published:2011-10-27
  • Contact: LIU Hong-Fang
  • Supported by:

    The project was supported by the Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, China (201022).

Abstract: The effect of rare earth Ce3+ on the growth of sulfate reducing bacterial (SRB) and the microbial induced corrosion (MIC) of aluminum alloy LY12CZ was studied by ultraviolet spectrophotometry (UVS), maximum probable number (MPN), cyclic anodic polarization, electrochemical impedance spectroscopy (EIS), and epi-fluorescence microscopy (EFM). The results showed that the low concentrations of Ce3+ could promote the growth of SRB while high concentrations had an inhibiting effect. Cyclic anodic polarization curves indicated that the pitting sensitivity of LY12CZ became lower in solutions containing rare earth Ce3+. EIS confirmed that corrosion resistance increased with an increase in the concentration of Ce3+. However, when inoculated with 1% SRB, the corrosion resistance was optimal at a Ce3+ concentration of 0.376 mg·L-1 because of a synergistic effect between the biofilm and the rare earth conversion film. The growth of SRB was inhibited with an increase in the Ce3+ concentration which prevented the biofilm forming completely on the surface of the matrix. At the moment, the effect of MIC was more notable than the protection of rare earth conversion film that formed on the surface of aluminum alloy.

Key words: Sulfate reducing bacterial, Aluminum alloy LY12CZ, Rare earth conversion film, Electrochemical method, Hormesis effect


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