The function of galvanizing is to prevent steel from rusting, and steel is easily corroded in the natural atmosphere. While zinc is not easy to change in dry air, it will form a dense zinc carbonate protective film on the surface in a humid environment, which can effectively protect steel.
There are generally three types of galvanizing processes and methods: mechanical galvanizing, hot galvanizing and cold galvanizing:
1. Mechanical galvanizing
The mechanical galvanizing process is a relatively traditional galvanizing process. The zinc powder is attached to the plated parts through mechanical collision and chemical agent adsorption to form a coating.
2. Hot-dip galvanizing, also known as hot-dip galvanizing
First, pickling the plated parts to remove the oxide layer on the surface of the plated parts, providing conditions for the firm adhesion of the plating layer, cleaning with ammonium chloride or zinc chloride plating flux, further removing impurities on the surface of the plated parts, and then putting them into the hot-dip coating tank The zinc solution is soaked in the zinc solution to make the zinc solution evenly and densely adhere to the plated parts to form a coating.
3. Cold galvanizing, also called electro galvanizing
After removing surface oil and dust, pickling and cleaning to remove impurities on the surface of the plated piece, put it in a zinc salt solution, and place a zinc plate on the opposite side of the plated piece, and then connect the plated piece to the negative pole of the electrolytic equipment, and the zinc plate is connected to the positive pole of the electrolytic equipment , turn on the power, and make the zinc layer adhere to the plated parts through electrolytic reaction.
With the continuous maturity of the new process, the mechanical plating method has been eliminated, and the commonly used processes are hot-dip galvanizing and cold-dip galvanizing.
