Shenzhen Alu Rapid Prototype Precision Co., Ltd.

No, die cast zinc (typically alloys like Zamak, containing zinc with aluminum, magnesium, and copper) does not rust in the conventional sense.Rust specifically refers to the red-brown iron oxide that forms on iron or steel, which flakes off and leads to structural degradation. Die cast zinc contains little to no iron, so it cannot form this type of rust.Instead, zinc alloys are highly corrosion-resistant. When exposed to air and moisture, they form a protective layer of zinc oxide or zinc carbonate (often appearing as a dull gray patina or "white rust"—a powdery white substance). This layer adheres tightly to the surface and slows further corrosion, unlike iron rust which accelerates damage.

Key points on corrosion behavior:

1.Excellent resistance in normal atmospheric conditions, indoors, or mild outdoor environments.

2.Performs well where galvanized steel succeeds, but may corrode faster in severe marine (salty) or highly humid/acidic settings.

3."White rust" can form with prolonged condensation but is usually cosmetic and doesn't rapidly degrade the metal; protective coatings (e.g., chromate, plating) prevent it.

4.Modern die cast zinc alloys (post-1960s) avoid issues like "zinc pest" (destructive intercrystalline corrosion) due to high-purity materials.

Die cast zinc is widely used in automotive parts, hardware, and consumer goods precisely because of its durability and lack of rusting like steel. For enhanced protection in harsh conditions, finishes like chrome, powder coating, or painting are common.