Effect of Silver Composition on Electrochemical Degradation of AlZn Alloy
Por:
Valdez S., Pech-Canul M.I., Ascencio-Gutiérrez J.A., Casolco S.R.
Publicada:
1 jul 2013
Categoría:
Electrochemistry
Resumen:
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
Filiaciones:
Valdez S.:
UNAM, Inst Ciencias Fis, Cuernavaca 062210, Morelos, Mexico
Pech-Canul M.I.:
CINVESTAV-US, Carretera Saltillo-Monterrey Km13, Saltillo Coahuila, Mexico
Ascencio-Gutiérrez J.A.:
UNAM, Inst Ciencias Fis, Cuernavaca 062210, Morelos, Mexico
Casolco S.R.:
Instituto Tecnológico y de Estudios Superiores de Monterrey, ITESM-Puebla, Vía Atlixcáyotl 2301, 72800 Puebla, Puebla, Mexico
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