Abstract：Hot-dip aluminized zinc steel plate is widely used in construction, household appliances and other industries because of its excellent corrosion resistance, heat resistance and high temperature oxidation resistance. However, it is difficult to control the surface quality and processability of thick steel plate during hot-dip galvanizing. In order to study the influence of hot-dip galvanizing process and cooling process after hot-dipping on the above problems, using CAG-III hot-dip galvanizing simulator, experiments were carried out on low-carbon steel plates with different dipping temperature, dipping time, strip-entry temperature and cooling rate after hot-dipping, and the surface morphology and microstructure of the samples were analyzed by scanning electron microscope and energy dispersive spectrometer. The experimental results show that under different processes, hot-dip aluminized zinc coating is composed of light gray Al-rich phase, bright white Zn-rich phase, black Si-rich phase and dark gray Fe-Al-Zn-Si quaternary alloy phase. When the dipping temperature is 600 ℃, dipping time is 3 s, strip-entry temperature is 610 ℃, and cooling rate after hot-dipping is 25 ℃/s, the coating surface is the smoothest, the zinc spangle is small, and the alloy layer is thin. These parameters are the most suitable hot-dip parameters. The research results can provide some reference for the process control of hot-dip aluminized zinc steel plate production in enterprises.
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