Both hot-dip galvanizing and cold-galvanizing are zinc processing techniques. Hot-dip galvanizing requires melting zinc, while cold-galvanizing adopts an electrolytic method. They are very different during production, but they are similar in the performance of the finished product. So how to distinguish hot-dip galvanizing and cold-galvanizing? What are the differences between them in which aspects? Let’s understand together!

The differences between hot-dip galvanizing and cold-galvanizing can be distinguished from several aspects.

First, the differences between hot-dip galvanizing and cold-galvanizing.

Different thicknesses.

The zinc layer of hot-dip galvanizing is relatively thick itself, generally with a thickness of more than 10 um, so it has good anti-corrosion ability. Although the surface is bright, it is slightly rough and zinc flowers may appear. While the zinc layer of electro-galvanizing is very thin, only about 3-5 um in thickness. Although the surface is smooth, there will be dull and dirty manifestations, with good processing performance and insufficient corrosion resistance.

Different outputs.

Hot-dip galvanizing belongs to mass production, so it has a good output. While electro-galvanizing cannot be produced in large quantities, so its output is relatively low.

Different prices.

The surface effect, processing performance, and adhesion of electro-galvanizing are all good, and the price will be more expensive than that of hot-dip galvanizing. Moreover, the cost of electro-galvanizing itself is higher, so its price is also high.

Different coating structures.

The surface of hot-dip galvanizing belongs to a pure zinc coating, and the coating is uniform and without pores, but there is also a relatively brittle compound between the coating and the substrate. While the coating of electro-galvanizing is only composed of zinc atoms, which are zinc atoms deposited and precipitated on the surface of the steel strip, which belongs to physical adhesion. There are many pores on the surface, so it is more prone to corrosion.