Analysis and Calculation of Electrodeposition Process of Zn Alloy Coatings

Abstract:

Electrodeposited Zn-Fe alloy coating has good anti-corrosion performance and has been widely applied to protect steel materials from corrosion. In this paper, Zn-Fe alloy coatings were plated from acidic sulphate bath, and the relationship between real concentration of metallic complexes ([ZnL+] and [FeL+]) in the bath, which was calculated through solving nonlinear equations by METLAB software, and components of alloy coatings was studied. When ZnSO4•7H2O added in the bath increases from 10 g/L to 50 g/L, the ratio of ferrous complex to total complex decreases from 81.96% to 46.76%, simultaneously the iron content in Zn-Fe alloy coatings decreases from 26.82% to 6.32%. As FeSO4•7H2O and (NH4)2SO4 added in the bath increases from 40 g/L to 80 g/L respectively, the ratio of ferrous complex to total complex increases from 50.02% to 66.23% and from 58.65% to 60.37% respectively, simultaneously the iron content in coatings increases from 8.26% to 13.77% and from 9.28% to 11.92% respectively. The results show that variation of concentration of metallic complexes in the bath can lead to variation of components of coating proportionally.

• Periodical: Advanced Materials Research (Volumes 139-141)
• Pages: 386-389
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.139-141.386
• Online since: October 2010
• Authors: Yun Ying Fan, Dong Hua Chen, Xiao Jing Liu
• Keywords: Alloy Coating, Calculation, Electro-Deposition, Metallic Complex

References

[1] B. Edward and R.R. Sizelove: Metal Finishing, Vol. 105(2007), p.276.

[2] D. Sylla, C. Savall, M. Gadouleau, C. Rebere, J. Creus and Ph. Refait: Surface and Coatings Technology, Vol. 200(2005), p.2137.

DOI: 10.1016/j.surfcoat.2004.11.020

[3] J.L. Ortiz-Aparicio, Y. Meas, G. Trejo, R. Ortega, T.W. Chapman, E. Chainet and P. Ozil: Electrochimica Acta, Vol. 52(2007), p.4742.

DOI: 10.1016/j.electacta.2007.01.010

[4] L.L. Barbosa and I.A. Carlos: Surface and Coatings Technology, Vol. 201(2006), p.1695.

[5] P. Bhatnagar and L.F. Michael: Surface and Coatings Technology, Vol. 200(2006), p.6083.

[6] C. Domínguez-Ríos, M.V. Moreno, R. Torres-Sánchez, W. Antúnez, A. Aguilar-Elguézabal and J. González-Hernández: Surface and Coatings Technology, Vol. 202(2008), p.4848.

DOI: 10.1016/j.surfcoat.2008.04.069

[7] F.Z. Yang, S.K. Xu and S.M. Zhou: Electroplating and Finishing, Vol. 10(1991), p.25 (in Chinese).

[8] Y.J. Zhang, Y.Y. Fan and X.W. Yang: Materials Protection, Vol. 35(2002), p.54 (in Chinese).