Effects of magnetic field and rare earth addition on corrosion behavior of Al-3.0Â wt% Mg alloy

- The effects of magnetic field on corrosion behavior of AlMgRE alloy are discussed.
- The influences of RE content on corrosion behavior of AlMg alloy are studied.
- Magnetic field has different effects on C.B. of the alloys with different RE content.
- The alloy with 0.12% RE addition had the best anti-corrosion resistance.

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 (Ecorr), impede the growth of pitting holes and reduce the corrosion current density icorr and corrosion rate of Al-3.0 wt%Mg-xRE alloys. Proper content of RE would increase the corrosion resistance of Al-3.0 wt%Mg alloys. Excessive RE 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.