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The effect of continuous heating on the phase transformations in zinc- iron electrodeposited coatings

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Abstract

The crystal structure and phase transformations of electrodeposited zinc-iron coatings were investigated by several techniques. The phase composition of as-plated zinc-iron coatings was found to contain both 17 phase and8 phase and, according to the equilibrium phase diagram, was in a nonequilibrium condition for the compositions investigated. The transformation toward equilibrium during heating was a two-stage process. The first stage of transformation, at temperatures between 25 °C and 360 °C, is accomplished with very little change in composition, and the phase transformation occurs within the coating itself. It is proposed, through a simplified analysis, that the phase transformation in this stage is supported by short-range diffusion. In the second stage of the transformation, at temperatures above 360 °C, the iron content in the coating increases as a result of interdiffusion between the coating and the base steel, and the phase structure moves to the iron-rich side in accordance with the equilibrium phase diagram.

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Authors and Affiliations

  1. Department of Materials Science, Jiao Tong University, 200030, Shanghai, People's Republic of China

    Mingyuan GU (Associate Professor)

  2. Department of Materials Science and Engineering, Lehigh University, 18015, Bethlehem, PA

    M. R. Notis (Professor)

  3. Energy Research Center, Lehigh University, 18015, Bethlehem, PA

    A. R. Marder (Associate Director)

Authors
  1. Mingyuan GU
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  2. M. R. Notis
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  3. A. R. Marder
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MINGYUAN GU, formerly Visiting Research Scientist, Energy Research Center

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Mingyuan, G., Notis, M.R. & Marder, A.R. The effect of continuous heating on the phase transformations in zinc- iron electrodeposited coatings. Metall Trans A 22, 1737–1743 (1991). https://doi.org/10.1007/BF02646497

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  • DOI: https://doi.org/10.1007/BF02646497

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