Appearance:
The appearance of hot-dip galvanized square tubes is slightly rougher than that of cold-dip galvanized square tubes; the appearance of cold-dip galvanized square tubes is relatively smooth and bright.

Zinc layer thickness:
There is a big difference between cold-dip galvanized square tubes and hot-dip galvanized square tubes in the galvanizing process; the corners of cold-dip galvanized square tubes are prone to "electrical burning". The color of this part is dark and the zinc layer is thicker. It is easy to form a current dead angle in the inner corner to produce an undercurrent area. The zinc layer in this area is thinner, and there is no zinc layer attached to the inner wall of the cold-dip galvanized square tube.
The cold-dip galvanized square tube has no zinc nodules, agglomerations, etc. as a whole, but the overall zinc layer is thinner, and the thickness of the outer wall zinc layer is 5μm-10μm.
The inner and outer walls of the hot-dip galvanized square tube are both attached with zinc layers, there will be water marks and a few zinc nodules, but the overall zinc layer is thicker, and the thickness of the zinc layer on the inner and outer walls of the square tube is more than 70μm.

Color:
Cold-dip galvanized square tubes are yellowish-green, bluish-white, or slightly colorful at a certain angle to the sun. Hot-dip galvanized square tubes are silvery white at a certain angle to the sun.

Answers

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