Galvanizing process of square and rectangular tubes

A) What are the two galvanizing processes for square and rectangular tubes?

Galvanized square tube, also known as galvanized square tube, is a square tube that has been galvanized. According to different production processes, galvanized square tube can be divided into two types: hot-dip galvanized square tube and cold-galvanized square tube:

1. Hot-dip galvanized square tube

It is a galvanized square tube formed after a series of chemical reactions by placing the square tube in a hot-dip galvanizing bath after being crimped and formed by a steel plate or a steel strip. There are many kinds of hot-dip galvanizing methods, such as wet method, dry method, lead-zinc method, redox method, etc. The main difference between different hot-dip galvanizing methods is what method is used to activate the surface of the pipe body to improve the quality of galvanizing after the steel pipe is acid dipped and cleaned. In the production, dry method and redox method are mainly used.

2. Cold galvanized square tube
Also known as electro-galvanized square pipe, it is to put the made square pipe into the electrolyte, the liquid contains zinc, after electrification, the electroplating operation is carried out, and the zinc powder or galvanized coating and the steel of the square pipe are fully contact to form a galvanized layer.

B) What is the difference between hot dip galvanized square pipe and cold galvanized square pipe?

The main difference between hot-dip galvanized square pipe and cold-dip galvanized square pipe lies in the different production processes. In addition, there are also certain differences in appearance, use, price, etc.:

1. Different appearance
The appearance of the cold galvanized square tube is relatively smooth and bright.
The angle is slightly colorful; the appearance of the hot-dip galvanized square pipe is slightly rougher than the cold-galvanized square pipe, and it is silver-white, and the appearance is prone to process water lines and a little dripping tumor, especially in the process of production.
One end of the piece is more obvious.

2. Different anti-corrosion properties
Compared with hot-dip galvanized pipe, cold-dip galvanized pipe has worse corrosion resistance, and the corrosion resistance of hot-dip galvanized pipe is dozens of times that of cold-dip galvanized pipe.

3. Different uses
Hot-dip galvanized square and rectangular pipes are mainly used in curtain walls, construction, machinery manufacturing, solar power generation brackets, steel structure projects, etc., especially in curtain walls and buildings, which are widely used;
Cold galvanized square tube is characterized by high strength and light structure, and is mainly used in general occasions.

4. Different prices
Under the same thickness and size, the price of hot-dip galvanizing is more expensive than that of cold-galvanizing. This is because the cold-galvanized square tube only needs to be plated on one surface, and the whole square tube must be plated with respect to the hot-dip galvanized square tube.For galvanizing, the production cost is naturally lower.Of course, although the difference between the hot-dip galvanized square tube and the cold-dip galvanized square tube is relatively large, there is actually no difference between the two, and the appropriate square tube can be selected mainly according to the actual needs.