Redox Reactions Values of AlZn + Ag Eutectoid Chemical Composition

Socorro Valdez, Jorge A. Ascencio, Angélica Meneses, Sid R. Casolco

Facultad de Farmacia, Universidad Autónoma del Estado de Morelos, Cuernavaca, México.
Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, México.
Instituto Tecnológico y de Estudios Superiores de Monterrey, Vía Atlixcáyotl, México.

DOI: 10.4236/msce.2014.28003                

Abstract

The effect of IB element additions [Ag] on the corrosion behavior of AlZn alloy has been investigated. The potentiodynamic polarization curves revealed that the corrosion behavior of SS_Al, SS_Zn and AgZn₃ phases was significantly influenced by IB element content. The electrochemical investigations showed that the corrosion rate increased with the IB-element additions. 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 due to the presence of the intermetallic compound (IMCs) AgZn₃.

Keywords

AlZn Alloys, Ag Additions, Polarization Curve, AgZn₃ Precipitate

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Yan, L.Z., Zhang, Y.A., Li, X.W., Li, Z.H., Wang, F., Liu, H.W. and Xiong, B.Q. (2014) Effect of Zn Addition on Microstructure and Mechanical Properties of an Al-Mg-Si Alloy. Progress in Nature Science: Materials International, 24, 97-100. http://dx.doi.org/10.1016/j.pnsc.2014.03.003
[2]	Zhang, X., Vu, T.-N., Volovitch, P., Leygraf, C., Ogle, K. and Wallinder, O. (2012) The Initial Release of Zinc and Aluminum from Non-Treated Galvalume and the Formation of Corrosion Products in Chloride Containing Media. Applied Surface Science, 258, 4351-4359. http://dx.doi.org/10.1016/j.apsusc.2011.12.112
[3]	Liu, J.-T., Zhang, Y.-A., Li, X.-W., Li, Z.-H., Xiong, B.-Q. and Zhang, J.-S. (2014) Thermodynamic Calculation of High Zinc-Containing Al-Zn-Mg-Cu Alloy. Transactions Nonferrous Metals Society of China, 24, 1481. http://dx.doi.org/10.1016/S1003-6326(14)63216-7.
[4]	American Society for Testing and Materials, ASTM G31-72 (1999) Standard Practice for Lab Immersion Corrosion Testing of Metals.
[5]	American Society for Testing and Materials, ASTM G1-90 (1999) Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens.
[6]	Standard Specification for Substitute Ocean Water, ASTM D1141-75.
[7]	Chang, Z.-T., Cherry, B. and Marosszeky, M. (2008) Polarisation Behavior of Steel Bar Samples in Concrete in Seawater. Part 2: A Polarization Model Form Corrosion Evaluation of Steel in Concrete. Corrosion Science, 50, 3078-3086. http://dx.doi.org/10.1016/j.corsci.2008.08.021
[8]	Badawy, W.A., El-Sherif, R.M. and Shehata, H. (2009) Electrochemical Stability of Cu-10al-5Ni Alloy in Chloride- Sulfate Electrolytes. Electrochemical Acta, 54, 4501-4505. http://dx.doi.org/10.1016/j.electacta.2009.03.040
[9]	Osório W.R., Goulart P.R. and Garcia, A. (2008) Effect of Silicone Contente on Microstructure and Electrochemical Behavior of Hypoeutectic Al-Si Alloys. Materials Letters, 62, 365-369. http://dx.doi.org/10.1016/j.matlet.2007.05.051
[10]	Saad, G., Fawzy, A. and Shawky, E.J. (2009) Effect of Ag Addition on the Creep Characteristics of Sn-8.8 wt% Zn Solder Alloy. Alloys and Compounds, 479, 844-850. http://dx.doi.org/10.1016/j.jallcom.2009.01.069