Surface contaminants will create an ungalvanized area where the contaminant was originally located. This can be caused by paint, oil, wax, or lacquer not removed during the pretreatment cleaning steps. Surface contaminants, as seen in the image to the left, should be mechanically removed prior to the galvanizing process. If they result in bare areas, then the repair requirements apply and small areas may be repaired, but a large area is grounds for rejection, and the entire part must be regalvanized.
© 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.