In principle, this kind of welding mesh, in the horizontal wire and vertical wire overlap parts, spraying powder is not able to completely cover, so there will be water entering this part when it is wet or raining, causing rust; 

If there is galvanized layer protection, there will be no such problem, galvanized than spray zinc rich powder cost is higher, we choose a high cost process, is to solve the problem of rust. 

The whole welding and polishing finish galvanized, no dead Angle formed galvanized protective layer; Then spray high-quality outdoor electrostatic polyester powder, double rust prevention, long-term use without rust. 

If the frame is not galvanized, there is no anti-rust measure, which leads to local modification easily, and the service life is greatly affected.