| Coating Type |
How It’s Done |
Where It's Used |
Rust Protection |
| Electro-galvanized |
A thin zinc layer is added using electricity. |
General-use bolts and parts that need basic rust protection. |
Gives moderate rust protection. |
| Zinc–Nickel Alloy |
A stronger zinc coating mixed with nickel. |
Cars, engines, and parts exposed to heat or chemicals. |
Very strong rust and salt-spray protection. |
| Nickel Plated |
A shiny nickel layer is added for appearance. |
Decorative parts or items needing a smooth finish. |
Looks good but not great against rust. |
| Chrome Plated |
A thin chrome layer is added over nickel. |
Shiny, decorative parts—home, car, or interior items. |
Good shine, limited rust protection. |
| Mechanical Galvanizing |
Zinc powder is applied by shaking and impact. |
High-strength bolts where hydrogen risk must be avoided. |
Good rust resistance. |
| Hot-Dip Galvanized |
Parts are dipped into hot molten zinc. |
Outdoor, structural, or heavy-duty use. |
Excellent long-term rust protection. |