1. Passivation

2. Galvanized/galvanized

3. Plated alloy/zinc-iron alloy

Nuts plated with lattice alloy/zinc-iron alloy are generally nut fasteners that require high rust resistance. Generally, nuts that have been surface treated with lattice alloy/zinc-iron alloy can withstand up to a thousand hours of salt spray. test.

4. Electrophoresis

5. Spray painting