Fence Surface Treatment
Metal fence is a kind of security using in outdoor, so the fence surface treatment will influence the lift time a lot. In traditionally, there are several basic types of fence surface treatment in the global market. If we sort them out by lift time long to low, there are hot dipped galvanized after production, galvanized + polyester powder coated, galvanized + PVC coated, galfan material, pre – hot dipped galvanized and electric galvanized.
For hot dipped galvanized fence surface treatment, we need to produce the fence before surface treatment. For example, need to weld the fence panel first, then do the zinc dipping process. Normally the zinc coating mass could reach minimum 500g/m2, much higher than normal galvanized.
Regarding the galvanized + polyester powder coated surface treatment, we need to use an normal galvanized to be an pre – treatment to increase the adherence of the polyester powder, then spray the polyester powder on the galvanized material and heat it. Its life time will be also comparing longer than other finishing, and also the color of polyester powder has a lot of choice.
Galvanized + PVC coated’s life time is shorter than above two surface treatment even the thickness of PVC layer is much thicker than polyester powder coated layer, but the adherence is lower. The air and rain water is easy to get into the space between zinc layer and PVC layer to make it rusty.
Galfan material is a kind of zinc alloy surface treatment which is mix the Zn & Al together with a percentage of 95% & 5%, this is better than pre – hot dipped galvanized surface treatment and it’s the best choice for pre – surface treatment.
Another two fence surface treatment is pre – hot dipped galvanized and electric galvanized. Normally the pre – hot dipped galvanized zinc coating mass can reach in the range of 40 ~ 300g/m2, but electric galvanized can only be 8 ~ 12g/m2.
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