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Surface Oxidation of the High-Strength Steels Electrodeposited with Cu or Fe and the Resultant Defect Formation in Their Coating during the Following Galvanizing and Galvannealing Processes

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Abstract

This study examined the surface oxidation of high-strength steels electrodeposited with Cu or Fe and the resultant defect formation in their coating during the following galvanizing and galvannealing processes. The high-strength steels were coated with an Cu or Fe layer by the electroplating method. Then, the coated steels were annealed in a reducing atmosphere, dipped in a molten zinc, and finally transformed into galvannealed steels through the galvannealing process. The formation of Si and Mn oxides on the surface of the high-strength steel was effectively suppressed, and the density of surface defects on the galvanized steel was significantly reduced by the pre-electrodeposition of Cu and Fe. This effect was more prominent for the steels electrodeposited at higher cathodic current densities. The finer electrodeposit layer formed at higher cathodic current density on the steels enabled the suppression of partial surface oxidation by Mn or Si and better wetting of Zn on the surface of the steels in the following galvanizing process. Furthermore, the pre-electrodeposited steels exhibited a smoother surface without surface cracks after the galvannealing process compared with the untreated steel. The diffusion of Fe and Zn in the Zn coating layer in the pre-electrodeposited steels appears to occur more uniformly during the galvannealing process due to the low density of surface defects induced by oxides.

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Acknowledgment

The authors acknowledge the financial support from POSCO.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Chonnam National University, Gwangju, 500-757, Korea

    Yun-Il Choi (Research Assistant), Won-Jin Beom (Research Assistant) & Chan-Jin Park (Assistant Professor)

  2. Surface Treatment Department, POSCO, Gwangyang, 545-711, Jeonnam, Korea

    Doojin Paik (Principal Researcher)

  3. MAFE/ACE Development Department, POSCO, Gwangyang, 545-711, Jeonnam, Korea

    Moon-Hi Hong (Department Leader)

Authors
  1. Yun-Il Choi
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  2. Won-Jin Beom
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  3. Chan-Jin Park
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  4. Doojin Paik
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  5. Moon-Hi Hong
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Corresponding author

Correspondence to Chan-Jin Park.

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Manuscript submitted January 11, 2010.

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Choi, YI., Beom, WJ., Park, CJ. et al. Surface Oxidation of the High-Strength Steels Electrodeposited with Cu or Fe and the Resultant Defect Formation in Their Coating during the Following Galvanizing and Galvannealing Processes. Metall Mater Trans A 41, 3379–3385 (2010). https://doi.org/10.1007/s11661-010-0427-8

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  • DOI: https://doi.org/10.1007/s11661-010-0427-8

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