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Microstructural Evaluation of Double-Dip Galvanized Coatings on Carbon Steel

Published online by Cambridge University Press:  04 December 2017

Yraima Rico and
Edwuin J. Carrasquero
Yraima Rico*
Affiliation:
Universidad Nacional Experimental Politécnica "Antonio José de Sucre" UNEXPO, Vicerectorado Barquisimeto, Departamento de Ingeniería Metalúrgica. Venezuela.
Edwuin J. Carrasquero
Affiliation:
Grupo de Investigación en Caracterización, Procesamiento y Protección de Materiales, Facultad de Ciencias de la Ingeniería, Universidad Estatal de Milagro. Ecuador.
*
*(Email: iraima.rico@gmail.com)
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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.

Keywords

Znmicrostructurecoatingmetalscanning electron microscopy (SEM)

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MRS Advances , Volume 2 , Issue 62: International Materials Research Congress XXVI , 2017, pp. 3917 - 3923
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Copyright © Materials Research Society 2017 

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