No. | Plating solution | Work piece (45 # steel) | Thickness | Salt spray |
1 | trivalent chromium bath | Polish rods | 10 μm | 0.5 h |
2 | hexavalent chromium bath (micro cracks agent) | 24 h | ||
3 | trivalent chromium bath | Roughen bars | 40 - 50 μm | 1 h |
4 | hexavalent chromium bath (micro cracks agent) | 72 h | ||
5 | hexavalent chromium bath (without micro cracks agent) | Polish rods | 10 μm | 2 h |
6 | Roughen bars | 45 μm | 30 h |