Once the surface is prepared per ASTM D2092, it must be matched with a compatible coating system.
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Dull gray appearance. Zinc salts have washed away naturally by rain and wind, leaving a naturally rough zinc carbonate surface. astm d2092 pdf
While highly effective at preventing corrosion and saponification, the use of this method has decreased in recent years due to environmental and occupational health regulations regarding hexavalent chromium. Method C: Aqueous Chromic Acid Treatment
Field applications where chemical immersion tanks are unavailable, but high adhesion is still mandatory. Once the surface is prepared per ASTM D2092,
What are you planning to apply?
Here is the safe, compliant way to download the PDF: Here is the safe, compliant way to download
This is the most common industrial method. It involves applying a zinc phosphate solution that reacts with the surface to form a crystalline layer, providing an excellent mechanical "tooth" for the paint.
Painting over zinc-coated (galvanized) steel is a notoriously difficult task in industrial coating applications. Without proper surface preparation, paint coatings applied to galvanized steel often fail prematurely through peeling, blistering, and delamination.
When chemical treatments are impractical, mechanical methods are used to roughen the smooth zinc surface, creating a profile for mechanical paint interlocking.
Whether you are working with .
