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.
© 2019 American Galvanizers Association. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. The information provided herein is not intended as a representation or warranty on the part of the AGA. Anyone making use of this information assumes all liability arising from such use.