Experimental study reveals increased silver content accelerates corrosion in aluminum-zinc alloys, indicating that silver-zinc precipitates disrupt passive layer stability.
The chemical composition of metallic AlZnAg alloy is related with microstructure in order to know their influence on electrochemical degradation. The microstructure has been characterized by high transmission electron microscopy with energy-dispersive X-ray. The electrochemical behavior has been tested by potentiodynamic polarization tests. In addition, weight loss analysis was carried out for the corrosion rate. In electrochemical tests the results showed the significant influence of silver concentration on the dissolution reactions of Al-matrix, solid solution rich-Zn, and AgZn3 precipitate phase. The electrochemical investigation shows that the corrosion rate increases with the silver additions. Likewise, it was moreover evidenced the development of a film passive layer for the maximum silver content alloys; the passivity of this cover could be broken due to the existence of precipitate phase AgZn3. Based on this behavior the AgZn3 particles, and microstructural phases play a significant role in the corrosion process for the metallic AlZn alloys
No takes yet. Share an insight, caveat, or question.
Valdez et al. (2013) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: