The difference between cold-dip galvanized screw and hot-dip galvanized screw

The difference between cold-dip galvanized screw and hot-dip galvanized screw

Date:2021-10-01
 Hot-dip galvanized wire rod is immersed in a molten zinc solution. The production speed is fast, and the coating is thick but uneven. The minimum thickness allowed by the market is 45 microns and the maximum can reach more than 300 microns. The color is darker, consumes a lot of zinc metal, and forms an infiltration layer with the base metal, and has good corrosion resistance. Hot-dip galvanizing can be maintained for decades in an outdoor environment.
The cold galvanized wire rod is the unidirectional current in the electroplating tank to gradually plate the zinc on the metal surface. The production speed is slow, the coating layer is uniform, and the thickness is thin, usually only 3-15 microns. The appearance is bright, and the corrosion resistance is poor. It will rust in a few months. Compared with the hot-dip galvanized screw, the production cost of the cold-dip galvanized screw is lower.
  Difference: The difference between cold-dip galvanized screw and hot-dip galvanized screw is that the amount of zinc is different, which can be identified from the color. The color of cold-dip galvanized screw is shiny, silvery and yellow. The hot-dip galvanized screw is shiny and white.