The influence of pouring temperature on the corrosion resistance of Al-4.5 Mg-3 Si alloy was investigated by electrochemical work station

scanning electron microscope

X-ray diffraction and laser scanning confocal microscope. The results indicate that the corrosion resistance of Al-4.5 Mg-3 Si alloy tends to be increased with the decrease of pouring temperature. The corrosion potential of Al-4.5 Mg-3 Si alloy is increased from-1.324 1 V to-1.215 2 V

and the corrosion current density is decreased from 1.531 4×10

-5

A/cm~2to 1.272 6×10

-5

A/cm~2. Meanwhile

the corrosion rate is the lowest at 720 ℃

which is 14.00% of that of ones at 760 ℃

and the weight loss rate of alloy is decreased from 0.174 1 g to 0.027 0 g

which is 15.50% of that of ones at 760 ℃.