CVD Amorphous CrR
In development
- Low temperature process (<400°C)
- Non line-of-sight process
- High corrosion and water resistance
- Coating thickness from 1-50+μm
Uniformity on Complex Geometry
CrC layer on the flank of a thread CrC layer near the base of a thread
a-CrC Corrosion Resistance
0 hours testing 423 hours testing
Immersion corrosion testing per ASTM G31
No coating
Yellow solution = FeCl2Crystalline CrC
Green solution = CrCl3Amorphous CrC
Clear solution
| Sample | Weight loss (g) |
|---|---|
| Uncoated | 0.0300 |
| Crystalline CrC | 0.0550 |
| Amorphous CrC | <0.0005 |
Uncoated: dark corroded surface DLC (8 μm): 5-10% surface pitting a-CrC (2 μm): No visible pits; low mass loss a-CrC + DLC: No visible pits; no mass loss
The images below show results after 18 hrs.
| Sample | Weight loss (mg) | |
|---|---|---|
| 30 min | 18 hrs | |
| Uncoated | 2.5 | 44.0 |
| DLC (8 μm) | 0 | 16.9 |
| a-CrC (2 μm) | 0 | 1.4 |
| a-CrC (2 μm) + DLC (8 μm) | 0 | 0 |
