Shenzhen Alu Rapid Prototype Precision Co., Ltd.

Yes, die-cast zinc (typically Zamak alloys like Zamak 3 or Zamak 5) can be used in washdown environments, but only with proper protection. On its own, untreated die-cast zinc is not highly corrosion-resistant and will corrode fairly quickly when repeatedly exposed to water, cleaning chemicals, detergents, or high humidity — especially in food-processing, pharmaceutical, or marine washdown applications.

When die-cast zinc works well in washdown:

a.Plated or coated finishes are applied:

Chrome plating (very common) – excellent corrosion resistance and easy to clean.

Nickel plating – good resistance, slightly duller appearance.

E-coating + powder coat or clear powder coat – very durable in food-zone washdown.

.Electrophoretic coating (e-coat) followed by a topcoat.

Trivalent chromate + sealant (for yellow/gold-looking parts).

b.The part is fully sealed (no exposed raw zinc after machining or threading).

c.Washdown is low-pressure and uses mild detergents (not aggressive caustic or acidic cleaners).

When die-cast zinc is a bad choice:

a.Exposed/raw zinc or poor-quality plating in frequent high-pressure, high-temperature, or chemical washdown (e.g., IP69K food plants).

b.Environments with chlorides (bleach, saltwater splash) unless heavily protected.

c.Applications requiring USDA/FDA direct food contact without an approved coating (raw zinc is not considered food-safe).

Better alternatives for harsh washdown:

Stainless steel (304 or 316)

Anodized aluminum

Acetal (POM) or other engineered plastics

Zinc with high-performance coatings (e.g., Delta-Seal, Geomet, or ceramic coatings)