Electrochemical Behavior and Corrosion Study of Electrodeposits of Zn and Zn-Fe-Co on Steel


From industrialized baths, free of cyanide, the corrosion behavior of electrodeposits of zinc and zinc alloys was studied by means of electrochemical tests in aerated solution of 3.5% (0.6 M) NaCl at pH 8.2. In literature, several studies are found about zinc coatings and zinc alloys, for example, Zn-Ni and Zn-Co, nevertheless there is little about the ternary alloy Zn-Fe-Co. The Fe presence in the alloy results in a good adhesion to the substrate and allows application of these materials at higher temperatures. The electrochemical tests were carried out by obtaining open circuit potential curves with immersion time, potentiodynamic polarization curves and cyclic voltammetry. From the obtained results, the large potential differences observed between the steel and the electrodeposits showed that the last protect the substrate, acting as a sacrifice metal. The tests disclosed similar behaviors in both the current densities and the corrosion potential for electrodeposits of Zn and Zn-Fe-Co. After chromate passivation process, a significant decrease in corrosion density was noted for Zn and when the system was de-aerated there was change in the cathodic process mechanism.

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C. A. M. Dutra, E. N. Codaro and R. Z. Nakazato, "Electrochemical Behavior and Corrosion Study of Electrodeposits of Zn and Zn-Fe-Co on Steel," Materials Sciences and Applications, Vol. 3 No. 6, 2012, pp. 348-354. doi: 10.4236/msa.2012.36050.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] R. Favaron and L. M. Aleixo, “Voltammetric Determination of Zn (II) in Zn-Fe Alloy Electroplating Baths Using Square-Wave Voltammetry,” Journal of the Brazilian Chemical Society, Vol. 12, No. 2, 2001, pp. 173-179. doi:10.1590/S0103-50532001000200008
[2] A. Brenner, “Electrodeposition of Alloys,” Academic Press, New York, 1963.
[3] P. L. Neto, A. O. Souza, M. I. C. Nogueira and R. P. Colares, “Estudos da Corrosao de Eletrodepósitos de Zn-Ni, Zn-Fe e Zn-Co em meio de Cloreto e de Sulfato,” Coteq, Salvador, 2002.
[4] Z. Wu, L. Fedrizzi and P. L. Bonora, “Electrochemical Studies of Zinc-Nickel Codeposition in Chloride Baths,” Surface and Coatings Technology, Vol. 85, No. 3, 1996, pp. 170-174. doi:10.1016/0257-8972(96)02857-5
[5] E. Tada, S. Satoh and H. Kaneko, “The Spatial Distribution of Zn2+ during Galvanic Corrosion of a Zn/steel Couple,” Electrochimica Acta, Vol. 49, No. 14, 2004, pp. 2279-2285. doi:10.1016/j.electacta.2004.01.008
[6] C. B. Breslin, G. Treacy and W. M., Carrol, “Studies on the Passivation of Aluminium in Chromate and Molybdate Solutions,” Corrosion Science, Vol. 36, No. 7, 1994, pp. 1143-1154. doi:10.1016/0010-938X(94)90139-2
[7] D. S. Azambuja, E. M. A. Martini and I. L. Muller, “Corrosion Behaviour of Iron and AISI 304 Stainless Steel in Tungstate Aqueous Solutions Containing Chloride,” Journal of the Brazilian Chemical Society, Vol. 14, No. 4, 2003, pp. 570-576. doi:10.1590/S0103-50532003000400013
[8] R. Fratesi and G. Roventi, “Corrosion Resistance of ZnNi Alloy Coatings in Industrial Prodution,” Surface and Coatings Technology, Vol. 82, No. 1-2, 1996, pp. 158-164. doi:10.1016/0257-8972(95)02668-1
[9] G. D. Wilcox and D. R. Gabe, “Passivation Studies Using Group VIA Anions. Part 5: Cathodic Treatment of Zinc,” Britsh Corrosion Journal, Vol. 22, No. 4, 1987, pp. 254-258.

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