45# steel Hard Chrome Plated Piston Rod with mirror polishing for gas & oil cylinders
The surface of the products are grand with a special way and electroplated with hard chrome. Finished with mirror polishing, the product is endurable and anti-corrosion, can apply to various gas & oil cylinders, piston rods, packing, carpentry, textile, printing and dyeing machines, die casting machines, injection molding machines, other mechanical guide rods and carrier rods, etc.
1 material : top 45# steel
2 outer diameter tolerance : f7-f8 ( with other tolerances available)
3 surface roughness : Ra0.2-0.4
4 hard chrome thickness : 0.015-0.025mm
5 surface hardness : HV700-1150
6 straightness : 0.05-0.10m/m
7 standard length : 1-6 m
Note : those whose surface need to be high echoed with depth 1-3 mm and thickness HRC4552 can be customized. The thickness of plated chrome are vary according to applications : gas hydraulic = =0.02 mm , oil hydraulic is above 0.02 mm.
Process specification:
Chromic anhydride : 250-300g/l
Best value : 280
Sulphuric acid : 1.8-2.5g/l
Trivalent chromium : 2.5-5g/l
Additive A(DW-032A):10-20ml/l
Additive B(DW-032B):10g/l
Fluorine free anti-fog agent C( DW-026): 0.05~0.15ml/l
Temperature : 45-59° note that the temperature is not too high
Current density : 35-90A/dm2
Current efficiency : 30-35
KAF consumption : A 50ml/l B 0.25- 0.5g/l Fluorine free anti-fog agent C 0.01ml/l
100kg Chromic anhydride need to be fixed with A 3-5kg, B 0.5- 1kg C100ml
