Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effect of Nickel Addition in Hot Dip Galvanizing of Mini-mill Steels Containing Silicon

실리콘을 함유한 미니밀 소재의 용융아연도금성에 미치는 니켈첨가의 영향

  • Lee, H.J. (Dept. of Materials Science and Metallurgical Eng., Sunchon National University) ;
  • Kim, J.S. (Technical Research Laboratories, POSCO) ;
  • Chung, J.H. (Technical Research Laboratories, POSCO)
  • 이호종 (순천대학교 공과대학 재료.금속공학과) ;
  • 김종상 (포항제철(주) 기술연구소) ;
  • 정진환 (포항제철(주) 기술연구소)
  • Published : 1999.04.01
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Abstract

In this study the effect of nickel addition on the coating weight of mini-mill steels containing silicon has been studied. It is shown that the pure zinc accelerated growth of the alloy layers occurred by a rapid growth of the zeta phase at 0.06%Si. The addition of 0.06%Ni to a pure zinc bath was found to be very effective in reducing the coating weight and promoting preferential development of the delta phase. The coating obtained by immersion in the Zn-Ni bath shows the presence of a nickel-rich region between the zeta phase and the eta phase. It is suggested that nickel prevents the rapid growth of the zeta phase due to the formation of the Zn-Ni-Fe ternary compound, which may act as a barrier to inward diffusion of zinc or iron at the zeta-eta boundary.

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