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Microstructural Evaluation of Double-Dip Galvanized Coatings on Carbon Steel

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Abstract

The objective of this research is to evaluate the microstructure of a coating layer composed of Zn / Zn-5 % Al. It was performed by the double-dip method of a steel AISI 1020. The temperature of the immersion bath was 550°C and the coatings were performed using different immersion times. Microstructural characterization was done using optical microscopy, SEM, EDX and XRD. All coatings showed three defined zones. The first zone, corresponding to the steel/coating interface, it presents typical properties of a traditional galvanization process at high temperatures. In zone II, a very heterogeneous microstructure was observed; zone III showed a Zn-Fe matrix with compounds particles of Fe2Al5Znx. The XRD characterization detected the presence of Zn and Fe2Al5Zn0,4. It was concluded than microstructural properties of the coatings were similar for the three immersion times. It is important to remark that the presence of Fe and Al throughout the coating, due to the diffusion of iron from the base metal and aluminum, presents in the second immersion bath.

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Authors and Affiliations

  1. Vicerectorado Barquisimeto, Departamento de Ingeniería Metalúrgica. , Universidad Nacional Experimental Politécnica “Antonio José de Sucre” UNEXPO, Venezuela

    Yraima Rico

  2. Grupo de Investigación en Caracterización, Procesamiento y Protección de Materiales, Facultad de Ciencias de la Ingeniería, Universidad Estatal de Milagro, Ecuador

    Edwuin J. Carrasquero

Authors
  1. Yraima Rico
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  2. Edwuin J. Carrasquero
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Rico, Y., Carrasquero, E.J. Microstructural Evaluation of Double-Dip Galvanized Coatings on Carbon Steel. MRS Advances 2, 3917–3923 (2017). https://doi.org/10.1557/adv.2017.608

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  • DOI: https://doi.org/10.1557/adv.2017.608

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