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Dross Inclusion1
Example of Dross Inclusion

Dross inclusions are a distinct particle of zinc-iron inter-metallic alloy that can become entrapped or entrained in the zinc coating. Dross inclusions sometimes may be avoided by changing the lifting orientation or redesigning the product to allow for more effective drainage. If the dross particles are small and completely covered by zinc metal, they will not affect the corrosion protection, and are acceptable. If the dross particles are large, called a gross dross particle in the specification, and prevent the full galvanized coating from forming on the steel, then the dross particle must be removed and the area repaired.


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