Introduction To Bolt Factory Protection

  •    China Nut protective performance, usually electro-galvanized bolt layer thickness is 5-15μm, and hot-dip galvanized bolt layer is generally above 65μm, even as high as 100μm. Hot-dip galvanized bolts have good coverage, dense coating and no organic inclusions.

    As we all know, the mechanism of zinc resistance to atmospheric corrosion includes mechanical protection and electrochemical protection. Under atmospheric corrosion conditions, there are protective films of ZnO, Zn(OH)2 and basic zinc carbonate on the surface of the zinc layer, which can slow down the corrosion of zinc to a certain extent. When the layered protective film (also called white rust) is damaged, a new layer will be formed. When the zinc layer is seriously damaged and the iron substrate is endangered, zinc will produce electrochemical protection to the substrate. The standard potential of zinc is -0.76V, and the standard potential of iron is -0.44V. When zinc and iron form a microbattery, zinc is dissolved as an anode. It is protected as a cathode. Bolt Factory obviously has better atmospheric corrosion resistance to base metal iron than electro-galvanized.