Abstract
Aluminium-zinc alloys were added with silver micro-constituent by vortex method and hot-rolled. The understanding of microstructure-chemistry relationship during the electrochemical oxidation and the effect of silver additions on the corrosion behavior have been investigated. The results of potentiodynamic polarization curves and transmission electron microscopy (TEM) with energy-dispersive X-ray (EDX) revealed the importance of the silver addition in the microstructure. Ag content significantly influences the corrosion behavior of a-Al, h-Zn and e-AgZn3 phases. The electrochemical investigations showed that the corrosion rate increased with the additions of Ag micro-constituent. Furthermore, it was also evidenced the formation of a passive layer for the highest Ag content alloys. The passivity of this layer could be broken down due to the presence of the intermetallic compounds (IMCs) AgZn3. The AgZn3 particles are responsible for the localized corrosion because they act as local anodes. All this indicate that AgZn3 particles and microstructural features play an important role in the corrosion process for AlZnAg alloys
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