Through brief introduction of hot-dip galvanizing technique, this pa per analyses on each process's target, methods and requirements and, based on th e standard requirements and features of waveform guardrail, puts forward some pr oblems needing attention in hot-dip galvanizing technique and decisive factors influencing the working life of galvanizing boiler.

The development direction of the zinc immersion process was forecasted.

In hot dip 55%Al Zn alloy cladding of steel sheet by passivation method, the effects of concentration of passivant, passivation treatment and hot dip processes on the cladding thickness and quality are strdied by orthogonal designed test in this paper.

Chlorine removal from zinc-bearing wastes in alkaline leaching-electrowinning process;

The effects of impurities on the quality of the metallic zinc powder and the current efficiency in zinc alkaline leaching-electrowinning process are investigated.