Galfan Gabion Mesh is a kind of hexagonal wire mesh container, which is woven by Zn-Al rare earth alloy coated steel wire.Galfan contains a mixture of 95% zinc and 5% aluminum. The coating offers all the benefits of galvanized wire including its galvanic properties including the corrosion resistance properties of aluminum.
GALFAN, that is Zinc-aluminium alloy coating, it is developed in 1995 by the Galfan Corporation, this wire coating contains a mixture of 95% zinc and 5% aluminum and offers all the benefits of galvanized wire including its galvanic properties including the corrosion resistance properties of aluminum.
Experiments provide evidence that its corrosion resistance is three times higher than that of the traditional pure zinc coating. Therefore, it is now receiving widespread attention. Nowadays, some developed countries like America and some European countries are trying to replace the traditional zinc coating gabion baskets with 5% Zn-Al alloy gabions.
5% Aluminum-Zinc Alloy gabions:
The material of the 5% Zn-Al alloy gabion is 5% Zn-Al alloy steel wire. It is made into hexagonal mesh through weaving and then twisting three times by a special machine. According to the design requirements, the mesh panels may be clipped and then assembled into the form of different wire mesh containers. When the gabions are filled with rocks or stones, they can be used for the protection of embankment, subgrade, and river bank, etc.
10% Zn-Al alloy gabion:
Another type of Zn-Al alloy gabion is the 10% Zn-Al alloy gabion, which is made from the 10% Zn-Al alloy steel wire. Just like the 5% Zn-Al alloy gabion, it is also a hexagonal mesh woven and twisted by a special machine. The gabion box is finally formed through folding the whole mesh. Its application is nearly the same as that of the 5% Zn-Al alloy gabion, which is mainly used for the protection of subgrade, and embankment, etc.
Standard and Lifetime of Zn-Al alloy gabions
The service life of the Zn-Al alloy gabion is typically about 70 to 80 years, which is 3 times longer than the common galvanized steel wire. It has reached the national standard GB/T 20492-2006. 5% (10%) Zn-Al alloy gabions are mainly applied in damp environment, such as river, sea and other water conservancy projects. Its acid resistance, alkali resistance and corrosion resistance properties are far superior to the common low carbon steel wire products.
The coating weight applied is equivalent to the coating weights specified in BS443 for zinc coating before fabrication. The coating is applied to the wire prior to fabrication and goes through a wiping process which gives it a smooth coating as opposed to the hot dip process after manufacture (BS729). Claims of heavier minimum coating weights should be viewed with caution as they are difficult to achieve with any consistency.
Galfan gabion mesh has a high corrosion resistance performance, which is about 2-3 times higher than that of the commongalvanized gabion mesh under any conditions whether in the open air or in damp environment.
It has a high ductility and deformability. The galfan steel wire can withstand the test of winding and twisting under powerful deformation processes, and the zinc coating will not peel off.
Galfan gabion mesh can be used for slope protection, hillside afforestation, railway and highway fence, etc. It can also be made into gabion box or gabion mattress for the purpose of protecting rivers, dams and seawalls against water erosion.