Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


공학

한국표면공학회지 (32권2호 157-164)

Effect of Nickel Addition in Hot Dip Galvanizing of Mini-mill Steels Containing Silicon

실리콘을 함유한 미니밀 소재의 용융아연도금성에 미치는 니켈첨가의 영향

;;;
H. J., Lee;J. S., Kim;J. H., Chung;

Dept. of Materials Science and Metallurgical Eng., Sunchon National University;Technical Research Laboratories, POSCO;
Dept. of Materials Science and Metallurgical Eng., Sunchon National University;Technical Research Laboratories, POSCO;

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.

Keywords