Hot-dip galvanizing is to melt the zinc ingot at high temperature, then add some auxiliary materials, and then immerse the workpiece, that is, a layer of zinc. Next, let's take a look at the specific hot-dip galvanizing process. First, the workpiece is degreased, that is, chemically degreased to achieve complete wetting of the workpiece. After washing, it will be pickled. Adding sulfuric acid and corrosion inhibitor can not only pickle and avoid acid. The next step is to soak the solvent, also called binder, to ensure the activity of the workpiece and enhance the combination of coating and workpiece. After the completion, it is the drying and preheating process. In order to prevent the workpiece from being deformed due to a sharp rise in temperature during immersion plating, and removing residual moisture, it is prevented from causing splashing of zinc liquid.
The most important process of hot-dip galvanizing is pickling. If it is not handled well, the adhesion of galvanizing will be low or even fall off. The next step in drying is hot-dip galvanizing. It is best to have experienced staff to control the temperature immersion time and the speed of removal.
After hot-dip galvanizing, it is finished and passivated and cooled. When finishing, you can use vibration to remove excess galvanizing. The purpose of passivation is to improve the atmospheric corrosion resistance and reduce the probability of rust. Water is generally used for cooling, but the temperature should not be too low to prevent cracking of the workpiece.
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