Influence of alloyed magnesium on the microstructure and long term corrosion behavior of hot dip Al Zn Si coating in NaCl solution
Abstract The effects of alloyed magnesium on the corrosion behavior of hot dip Al Zn Si x Mg x 0, 1.25, 3 and 4 wt. coatings were investigated by analysis of the phase composition, long term immersion test and electrochemical measurements. Mg 2 Si phase appeared in the Al Zn Si 1.25Mg and Al Zn Si 3Mg coatings but only MgZn 2 phase existed on the surface of Al Zn Si 4Mg coating. The alloyed magnesium improves the corrosion resistance of the Mg containing coatings and the Al Zn Si 3Mg coating shows the highest protective properties in the investigation.