The Combined Impact of Magnetic Field and Chloride Ion Concentration on Corrosion Behavior of Al-Mg Alloys

Abstract

The impact of magnetic field on the corrosion behavior of Al-Mg-xR_E/Fe alloys in NaCl solutions with concentrations of 1.5wt%, 3.5wt%, and 5.5wt% were studied by microstructure observation, immersion test, and electrochemical test. The combined impacts of magnetic field and chloride ion concentration on the corrosion behavior of Al-Mg alloys with various electrode potential phases were discussed. The results indicate that Al-3.0Mg-xR_E/Fe alloys corrode faster and have a higher pitting corrosion potential in the NaCl solution with a higher concentration. In addition, a magnetic field can lower the pitting sensitivity and corrosion rate of Al-3.0Mg and Al-3.0Mg-0.2R_E/Fe alloys in NaCl solution with different concentrations. However, at a higher concentration of NaCl solution, the magnetic field has a weaker inhibiting effect on corrosion rate and pitting sensitivity. In NaCl solutions with concentrations of 1.5wt% and 3.5wt%, the corrosion rate and pitting sensitivity of Al-3.0Mg-1.0R_E/Fe alloys can be reduced by a magnetic field. However, in NaCl solution with the concentration of 5.5wt%, the corrosion rate of the alloys is increased by a magnetic field.

Keywords

magnetic field / corrosion behavior / chloride ion concentration / different electrode potential phases

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