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Metallurgical and Materials Transactions A

, Volume 47, Issue 9, pp 4594–4605 | Cite as

Mg Content Dependence of EML-PVD Zn-Mg Coating Adhesion on Steel Strip

  • Woo Sung Jung
  • Chang Wook Lee
  • Tae Yeob Kim
  • Bruno C. De CoomanEmail author
Article

Abstract

The effect of coating thickness and Mg concentration on the adhesion strength of electromagnetic levitation physical vapor deposited Zn-Mg alloy coatings on steel strip was investigated. The phase fraction of Zn, Mg2Zn11, and MgZn2 was determined for a coating Mg concentration in the 0 to 15 wt pct range. Coatings with a Mg content less than 5 pct consisted of an Zn and Mg2Zn11 phase mixture. The coatings showed good adhesion strength and ductile fracture behavior. Coatings with a higher Mg concentration, which consisted of a Mg2Zn11 and MgZn2 phase mixture, had a poor adhesion strength and a brittle fracture behavior. The adhesion strength of PVD Zn-Mg alloy coatings was found to be related to the pure Zn phase fraction. The effect of coating thickness on adhesion strength was found to be negligible. The microstructure of the interface between steel and Zn-Mg alloy coatings was investigated in detail by electron microscopy, electron diffraction, and atom probe tomography.

Keywords

Adhesion Strength Phase Fraction Physical Vapor Deposition Alloy Coating Steel Strip 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgment

The authors gratefully acknowledge the support of the members of the EML-PVD group of the POSCO Technical Research Laboratories in Gwangyang, South Korea. This work was supported by the Smart Coating Steel Development Center operated by the World Premier Materials Program funded by the Ministry of Trade, Industry, and Energy of the Republic of Korea.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2016

Authors and Affiliations

  • Woo Sung Jung
    • 1
  • Chang Wook Lee
    • 2
  • Tae Yeob Kim
    • 2
  • Bruno C. De Cooman
    • 1
    Email author
  1. 1.Materials Design Laboratory, Graduate Institute of Ferrous TechnologyPohang University of Science and TechnologyPohangRepublic of Korea
  2. 2.POSCO Technical Research LaboratoriesGwangyangRepublic of Korea

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