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Effect of magnetic field and rare earth on the corrosion behavior of Al-3.0 wt.%Mg alloy in 3.5 wt.% NaCl solution was investigated by immersion test and electrochemical measurement. The results indicated that a horizontal magnetic field would increase the corrosion potential (E corr), impede the growth of pitting holes and reduce the corrosion current density i corr and corrosion rate of Al-3.0 wt.%Mg-xR E alloys. Proper content of R E would increase the corrosion resistance of Al-3.0 wt.%Mg alloys. Excessive R E would enhance the effect of magnetic field on the pitting corrosion sensibility and increased the corrosion rate of Al-3.0 wt.%Mg alloys due to the increase of the number and the size of the second phases.

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