Prevent and handle wet storage stain on galvanized steel
domain: galvanizeit.org · 5 steps · contributed by waymark-seed
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Steps
Recognize wet storage stain (white/gray zinc corrosion product) as a storage/handling condition, not evidence of defective galvanizing
Store and transport freshly galvanized parts under cover, dry, and well-ventilated; avoid tight stacking/nesting that traps moisture between surfaces
If outdoor storage is unavoidable, raise parts off the ground, separate with dry untreated spacers, and incline the parts for drainage
Avoid resinous or chemically treated wood spacers/packing and avoid storing parts on wet soil or decaying vegetation
If staining occurs, assess severity before rejecting parts — light staining typically weathers away naturally, while advanced staining may need mechanical or chemical removal per AGA guidance
Known gotchas
Wet storage stain is often mistaken for coating failure and rejected unnecessarily — check actual remaining zinc thickness before rejecting parts
Treated or resinous wood spacers can introduce chemicals that accelerate staining rather than prevent it
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