Enhancing Bolt Performance: Key Surface Treatment Technologies

Bolts are critical components in mechanical systems, and their performance heavily depends on surface treatment technologies. Common methods include electroplated zinc, Dacromet/zinc flake coating, zinc-aluminum coatings (e.g., Geomet), and black phosphating.

Electroplated Zinc: Cost-effective with basic corrosion resistance, but requires strict hydrogen embrittlement control for high-strength bolts.

Dacromet/Zinc Flake Coating: Offers superior corrosion resistance, no hydrogen embrittlement risk, and stable friction coefficients, making it ideal for automotive and heavy-duty applications.

Zinc-Aluminum Coatings: Environmentally friendly (chromium-free) with excellent salt spray resistance, increasingly used in high-performance fasteners

Black Phosphating: Provides outstanding lubrication, wear resistance, and anti-galling properties, often used for precise torque control in critical joints.

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