ASTM A780
Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings, covers appropriate methods used to repair damaged hot-dip galvanized coatings on hardware, structural shapes, and other hot-dip galvanized products, including uncoated areas remaining after initial hot-dip galvanizing. Requirements concerning the renovation of uncoated areas after initial hot-dip galvanizing are contained within the material specifications (A123, A153, A767). The specification outlines three acceptable forms of touch-up: zinc-based solders, zinc-rich paints, and metallizing, as well as the required coating thickness of the repair.
ASTM D6386
Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting.
ASTM D7803
Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Powder Coating.
ASTM E376
Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Examination Methods. Eddy-current-type thickness measurement is a non-destructive test measuring variations in the impedance of an eddy-current inducing coil caused by coating thickness variations. They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate.
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