Effect of phosphorous surface segregation on iron-zinc reaction kinetics during hot-dip galvanizing

被引:0
作者
C. E. Jordan
R. Zuhr
A. R. Marder
机构
[1] Lockheed Martin,the Solid State Division
[2] Oak Ridge National Laboratory,the Department of Materials Science and Engineering
[3] Lehigh University,undefined
来源
Metallurgical and Materials Transactions A | 1997年 / 28卷
关键词
Material Transaction; Rutherford Backscattering Spectroscopy; Alloy Layer; Surface Segregation; Inhibition Layer;
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学科分类号
摘要
Phosphorous was ion implanted on one surface of a large grain (10 to 20 mm) low-carbon steel sheet in order to study the effect of surface segregation on the formation of Fe-Zn phases during galvanizing. Both an Al-free and a 0.20 wt pct Al-Zn bath at 450 °C were used in this investigation. It was found that P surface segregation did not affect the kinetics of Fe-Zn phase growth for the total alloy layer or the individual Fe-Zn gamma, delta, and zeta phase alloy layers in the 0.00 wt pct Al-Zn baths. In the 0.20 wt pct Al-Zn bath, the Fe2Al5 inhibition layer formed with kinetics, showing linear growth on both the P-ion implanted and non-P-ion implanted surfaces. Fe-Zn phase growth only occurred after extended reaction times on both surfaces and was found to directly correspond to the location of substrate grain boundary sites. These results indicate that P surface segregation does not affect the growth of Fe-Zn phases or the Fe2Al5 inhibition layer. It was shown that in the 0.20 wt pct Al-Zn bath, substrate grain boundaries are the dominant steel substrate structural feature that controls the kinetics of Fe-Zn alloy phase growth.
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页码:2695 / 2703
页数:8
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