The anti-corrosion rock bolt is widely applied to conditions which are influenced by underground water such as road, railway tunnel and which are corroded by seawater such as harbor, wharf and buildings on the sea affected. There are three classifications of anti-corrosion rock bolt.
Hot-dip galvanizing anchor bolt is one kinds of the anti-corrosion rock bolt. The oxidation film easily occurred on the zinc coating in the moist air. It can be isolated with water and air to prevent the chemical etching and the rusting. So the preservative effect is very well as a permanent support.
The duplex coating rock bolt adopts two corrosion-prevention measurements on the bolt surface, hot-dip galvanizing and epoxy coating , which can prevent corrosion very well. This kind of anti-corrosion rock bolt is mainly used in conditions which are influenced by underground water such as water conservancy project, sub-sea tunnel, etc.
Stainless steel anchor bolt is made of stainless steel materials. Owning to its good welding performance & inoxidizability, This kind of anti-corrosion rock bolt are mainly used in the permanent support of large initial stress of surrounding rock, or other projects which have special requirement for corrosion resistance.