Journal of Materials Engineering and Performance

, Volume 27, Issue 9, pp 4548–4560 | Cite as

The Influence of Galvanizing Parameters on the Structural Development of Zn-Al-Based Coatings

  • E. L. TironEmail author
  • A. Crisan
  • T. Bedő
  • M. Stoicanescu
  • M. A. Pop
  • D. Cristea


The evolution of some layers’ characteristics, deposited by galvanization, was monitored according to the technological parameters of the process. Two types of alloys from the Zn-Al and Zn-Al-Ti-B systems were used for deposition. The structure of the deposited layers was analyzed by optical and electron microscopy. The chemical composition, phases and compounds in the structures were identified. The mechanical properties of the structural constituents of the layers were determined by nanoindentation. These techniques highlighted the typical non-uniformities in terms of composition and properties in the layers, mainly due to the diffusion and distribution of iron from the steel substrate in the deposited layers. The evaluation of iron diffusion in the deposited layer was done by differential thermal analysis. The values of the critical temperatures (melting temperature, eutectic temperature and solidification temperature) were correlated with the parameters used during deposition. It was observed that the structure of the coatings is layered, with a specific order from the steel substrate to the edge. In these layers, the constituents are mixtures of soft solid solutions of Al in Zn (η and β) and hard intermetallic compounds. Moreover, increasing the immersion time in the galvanizing bath and the bath temperature leads to an increase in iron diffusion in the coating layer, which contributes to lower coating thickness, thus reducing its durability in operation.


chemical composition galvanizing temperature immersion time thermal analysis Zn-based alloys 



We hereby acknowledge the structural founds project PRO-DD (POS-CCE, O.2.2.1., ID 123, SMIS 2637, ctr. No 11/2009) for providing the infrastructure used in this work.


  1. 1.
    F. Delaunois and G. Guerlement, Installations sanitaires; l’acier galvanise a chaud au trempe devoile ses atouts, Galvano-Organo, 2007, 771, p 26–29Google Scholar
  2. 2.
    G.M. Song and W.G. Sloof, Effect of Alloying Element Segregation on the Work of Adhesion of Metallic Coating on Metallic Substrate: Application to Zinc Coatings on Steel Substrates, Surf. Coat. Technol., 2011, 205, p 4632–4639CrossRefGoogle Scholar
  3. 3.
    S.M.A. Shibli, R. Manu, and V.S. Dilimon, Effect of Nickel-Rich Barrier Layer on Improvement of Hot-Dip Zinc Coating, Appl. Surf. Sci., 2005, 245, p 179–185CrossRefGoogle Scholar
  4. 4.
    M.N. Avettand-Fenoel, N. David, G. Reumont, J.M. Fiorani, M. Vilasi, and P. Perrot, Assessment of the Fe-Sn-Zn Phase Diagram at 450°C. Application to the Batch Galvanizing, J. Therm. Anal. Calorim., 2007, 90, p 329–332CrossRefGoogle Scholar
  5. 5.
    C.S. Che, J.T. Lu, G. Kong, Q.Y. Xu, and J.H. Chen, Influence of Silicon in Steels on Galvanized Coatings, Acta Metall. Sin., 2006, 19, p 85–90CrossRefGoogle Scholar
  6. 6.
    K. Tachibana, Y. Morinaga, and M. Mayuzumi, Hot Dip Fine Zn and Zn-Al Alloy Double Coating for Corrosion Resistance at Coastal Area, Corros. Sci., 2007, 49, p 149–157CrossRefGoogle Scholar
  7. 7.
    J.B. Nasr, A. Snoussi, C. Bradai, and F. Halouani, Optimization of Hot-Dip Galvanizing Process of Reactive Steels: Minimizing Zinc Consumption Without Alloy Additions, Mater. Lett., 2008, 62, p 3328–3330CrossRefGoogle Scholar
  8. 8.
    J.B. Nasr, A. Snoussi, C. Bradai, and F. Halouani, Effect of the Withdrawal Speed on the Thickness of the Zinc Layer in Hot Dip Pure Zinc Coatings, Mater. Lett., 2008, 62, p 2150–2152CrossRefGoogle Scholar
  9. 9.
    Q. Luo, J.L. Chen, Y. Li, F. Yang, Q. Li, Y. Wu, J.Y. Zhang, and K.C. Chou, Experimental Study and Thermodynamic Assessment of the Al-Fe Rich Side of the Al-Zn-Fe System at 300 and 550°C, Comput. Coupling Phase Diagr. Thermochem., 2012, Google Scholar
  10. 10.
    P. Pokorny, J. Kolisko, L. Balik, and P. Novak, Reaction Kinetics of the Formation of Intermetallic Fe-Zn During Hot-Dip Galvanizing of Steel, Metallurgy, 2016, 55, p 111–114Google Scholar
  11. 11.
    M. Demirtas, G. Purcek, H. Yanar, Z.J. Zhang, and Z.F. Zhang, Effect of Chemical Composition and Grain Size on RT Superplasticity of Zn-Al Alloys Processed by ECAP, Lett. Mater., 2015, 5(3), p 328–334CrossRefGoogle Scholar
  12. 12.
    P. Pokorny, J. Kolisko, L. Balik, and P. Novak, Description of Structure of Fe-Zn Intermetallic Compounds Present in Hot-Dip Galvanized Coatings on Steel, Metallurgy, 2015, 54(4), p 707–710Google Scholar

Copyright information

© ASM International 2018

Authors and Affiliations

  • E. L. Tiron
    • 1
    Email author
  • A. Crisan
    • 1
  • T. Bedő
    • 1
  • M. Stoicanescu
    • 1
  • M. A. Pop
    • 1
  • D. Cristea
    • 1
  1. 1.Materials Science DepartmentTransilvania University of BrasovBrasovRomania

Personalised recommendations