🔧 Fastener Surface Treatment Options: A Comparison
To ensure long-term safety, corrosion resistance, and mechanical performance, different surface treatments are applied to fasteners used in parking lifts. Each method offers unique advantages depending on the application.
📋 Common Fastener Surface Treatments
| Treatment Method | Description |
|---|---|
| Electro-galvanizing (zinc plating) | A thin zinc coating via electroplating. Cost-effective, but limited corrosion resistance. |
| Hot-dip galvanizing | Thick zinc layer from molten dipping. Strong corrosion resistance, but uneven surface. |
| Dacromet® coating | Zinc-aluminum flake coating. Superior corrosion protection, no hydrogen embrittlement. |
| Black oxide (bluing) | Minimal corrosion resistance. Mostly for aesthetic or internal use. |
| Phosphating | Used for paint base or lubrication. Limited corrosion protection. |
| Nickel/Chrome plating | Decorative, good hardness, moderate corrosion resistance. |
| Powder coating / Paint | Thick coating for aesthetics and rust protection. Not ideal for threaded parts. |
📊 Comparison of Surface Treatments
| Property | Electro-galvanized | Hot-dip Galvanized | Dacromet® | Black Oxide | Phosphated | Nickel/Chrome | Powder Coated |
|---|---|---|---|---|---|---|---|
| Corrosion Resistance | ★★☆☆☆ | ★★★★☆ | ★★★★★ | ★☆☆☆☆ | ★★☆☆☆ | ★★★☆☆ | ★★★★☆ |
| Hydrogen Embrittlement | ⚠️ Yes | ❌ None | ✅ None | ⚠️ Yes | ⚠️ Yes | ⚠️ Yes | ❌ None |
| Appearance | Bright / Silver | Dull Gray | Silver-Gray | Matte Black | Gray-Black | Mirror Finish | Color Options |
| Coating Thickness | ~5–8μm | ~40–80μm | ~8–12μm | Very Thin | Thin | Moderate | 60–100μm |
| Thread Fit / Assembly | ✅ Good | ❌ Poor | ✅ Excellent | ✅ Good | ✅ Good | ⚠️ Moderate | ❌ May Interfere |
| Heat Resistance | ⚠️ Limited | ✅ Good | ✅ Excellent | ❌ Poor | ⚠️ Limited | ⚠️ Moderate | ⚠️ Depends |
| Cost | 💲 | 💲💲 | 💲💲 | 💲 | 💲 | 💲💲💲 | 💲💲–💲💲💲 |
✅ Why KETTP Chooses Dacromet® Coated Fasteners
As a leading manufacturer of parking lifts and automated parking systems, KETTP is committed to performance, safety, and long-term reliability. That’s why we standardize Dacromet coating for all critical fasteners.
🔒 Key Advantages of Dacromet
- Superior Corrosion Protection: Up to 1000+ hours salt spray resistance — ideal for outdoor and humid environments.
- No Hydrogen Embrittlement: Essential for high-strength bolts, ensuring structural safety.
- Precise Thread Fit: Coating maintains dimensional tolerance — unlike thick galvanizing.
- High Temperature Resistance: Works reliably up to 300°C.
- Eco-Friendly: Chromium-free, RoHS compliant, safe for environment and operators.
- Low Maintenance: Excellent lubricity reduces seizing, galling, and assembly wear.
🏁 Final Word
With Dacromet-treated fasteners, KETTP ensures maximum reliability in all environments — from coastal climates to industrial basements. It’s one of the many ways we prioritize quality, safety, and customer satisfaction.
