A, the difference between hot dip galvanizing and cold dip galvanizing
1、Difference in thickness
The zinc layer of hot-dip galvanizing is relatively thick, generally more than 10um thick, so it has good anti-corrosion ability, although the surface is bright, but slightly rough, there may also be zinc flowers. The zinc layer of electro-galvanization is very thin, about 3-5um thick, the surface is smooth, but there will be gray, staining performance, processing performance is better, corrosion resistance is not enough.
2、Different output
Hot-dip galvanizing is a high-volume production, so it has a good yield. Electro-galvanization is not produced in large quantities, so its output is lower.
3、Difference in price
Electro-galvanized surface effects, processing performance, and bonding are not available, so the price is more expensive than hot-dip galvanizing, and the cost of electro-galvanizing itself is higher, so the price is higher.
4、Different plating structure
The surface of hot-dip galvanizing is pure zinc plating, the plating is uniform and non-porous, but there is a layer of brittle compound between the plating and the substrate. The electro-galvanized coating is composed of zinc atoms only, which is deposited on the surface of the steel strip precipitation of zinc atoms, belongs to the physical adhesion, the surface has many holes to dry, so it is easier to be corroded.
Second, you can distinguish them from several aspects
1, distinguish from the process
Hot-dip galvanizing is a process that involves degreasing, pickling, dipping and drying of the workpiece before it can be dipped into a pool of molten zinc, which can be put forward after a certain amount of time. Cold galvanizing is actually electro-galvanizing, using electrolytic equipment to process, after degreasing, pickling and other processes immersed in a solution of zinc salts, connected to electrolytic equipment, in the positive and negative current directional movement of the workpiece precipitation deposited on the zinc layer.
2、Distinguish from the appearance
The overall appearance of hot-dip galvanizing is a little rougher, producing process water lines and dripping tumors, especially at one end of the workpiece, which is silvery white. The surface layer of electro-galvanization is smoother, mainly yellow-green, of course, there are also seven colors, green-white, white and green performance, the entire workpiece basically does not appear zinc tumor, lumps and other phenomena.
Editor’s Summary: The above is the difference between hot-dip galvanizing and cold-dip galvanizing, and can be distinguished from several aspects of their introduction, I hope the content I shared can give you some help, these two kinds of zinc suitable for use in different occasions, so when using must be distinguished to be good.