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Volume 42 Issue 10
Oct.  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(10): 2243-2249.
CHEN Xin, TIAN Wenming, LI Songmei, et al. Effect of chloride ion and temperature on corrosion of aluminum alloy in coolant[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(10): 2243-2249. doi: 10.13700/j.bh.1001-5965.2015.0627(in Chinese)
Citation: CHEN Xin, TIAN Wenming, LI Songmei, et al. Effect of chloride ion and temperature on corrosion of aluminum alloy in coolant[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(10): 2243-2249. doi: 10.13700/j.bh.1001-5965.2015.0627(in Chinese)
shu

Effect of chloride ion and temperature on corrosion of aluminum alloy in coolant

doi: 10.13700/j.bh.1001-5965.2015.0627

  • School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Funds:  National Natural Science Foundation of China (51271012)
  • Received Date: 23 Sep 2015
  • Publish Date: 20 Oct 2016
    Abstract
  • The effect of chloride concentration and temperature on the corrosion of aluminum alloy in the stimulated coolant was studied by potentiodynamic polarization and electrochemical impedance spectra. The surface characterization of aluminum alloy after polarization was featured by metallurgical microscope and scanning electron microscope. The results show that chloride ions would be involved in the film formation, and decrease the stability of the film. Under a certain temperature (30℃), when the concentration of chloride ion is higher than 0.01 mol/L, the adsorption of intermediate was significant. Inductive loop emerged in the low frequency part of Nyquist diagram, and pits initiate. With the increase of chloride ion concentration (more than 0.01mol/L), the corrosion resistance of aluminum alloy decreased. With the increase of temperature, as the resistance of anodic and cathodic reaction decreased, the rate of anodic and cathodic reaction increased, and corrosion rate increased. When the temperature rose, the dominant effect of diffusion in corrosion process was weakened due to the content of oxygen decreased，the adsorption effect of intermediate was enhanced and inductive loop emerged in the low frequency part. Temperature affects the size of single pit and facilitates the growth of pits.

     

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