2-8 Control of Silicon Reactivity in General Galvanizing
Studies indicate that Si disturbs the equilibrium states available in the Zn-Fe system and alters the growth mode of ζ crystallites in the coating, resulting in a steel reactivity problem in general galvanizing. This reactivity problem can be easily controlled by alloying the Zn bath with metals, such as Ni, if the Si content of the steel does not exceed 0.20％. In principle, to combat a fully developed reactivity problem is to stabilize the Γ and δ sub-layers in the coating. Alloying the bath with suitable metals can generate new equilibrium states to allow the co-existence of the liquid phase and the δ phase, thereby preventing the disintegration of the δ phase in the coating; the solid solution of the alloying elements in the Γ and Γ1 phases also stabilizes the Γ sub-layer. The introduction of Al to general galvanizing baths generates new equilibrium states, ushering in a total new approach to Si reactivity control.
Nai-Yong Tang
Teck Cominco Metals Ltd., Product Technology Centre 2380 Speakman Drive, Mississauga, Ontario, L5K 1B4, CANADA
国际会议
第七届亚太镀锌大会(The 7th Asia Pacific General Galvanizing Conference)(7th APGGC)
北京
英文
105-111
2007-09-14（万方平台首次上网日期，不代表论文的发表时间）