Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings
STANDARD published on 1.9.2020
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Designation standards: ASTM A780/A780M-20
Publication date standards: 1.9.2020
The number of pages: 4
Approximate weight : 12 g (0.03 lbs)
Country: American technical standard
Category: Technical standards ASTM
This practice describes methods that may be used to repair damaged hot-dip galvanized coatings on hardware, structural shapes, and other products fabricated prior to hot-dip galvanizing, and uncoated areas remaining after initial hot-dip galvanizing. The damage may be the result of welding or cutting (flame), in which case the coating will be damaged predominantly by burning. This practice can also be used to repair hot-dip galvanized coatings damaged by excessively rough handling during shipping or erection. Requirements concerning the renovation of uncoated areas remaining after initial hot-dip galvanizing are contained within the applicable material specification. This practice describes the use of three types of material that possess the required properties for repair of damaged galvanized coatings, namely: (1) zinc-based solders which includes low melting point zinc alloy repair rods or powders, (2) paints containing zinc dust, and (3) sprayed zinc (metallizing). The material used for repair shall have the specified coating thickness, shall provide barrier protection and preferably be anodic to steel, and application of the coating shall be possible under shop or field conditions.
Keywords:
coatings´zinc, galvanized coating repair, galvanized coatings, touch-up, zinc coating repair, zinc coatings,, ICS Number Code 25.220.40 (Metallic coatings)