The CrN is a kind of silver gray coating. It has great adherence power and good corrosion resistance and oxidation resistance. When the mechnical parts and moulds are PVD coated by CrN, the wearing resistance and lubricity will be improved. Compared with the TiN coating, the corrosion resistance ability of CrN against water solution is more great. The higher surface hardness, lower coefficient of friction and lower residual stress of CrN make it adapt to the occasions which need the above characters.
The CrN coating has very big hardness value:HV1700-2100, good corrosion resistance and
oxidation resistance(700℃), great adherence power and can be coated at low temperature(200-400℃). It is very proper to be applied on the moulds, and better than traditional Cr plating in wear resistance. These good characters of CrN will make it replace the Chemical plating of Cr which is a outdated technology in the surface treatment of moulds. It is often applied on the cutting tools used to cut brass products, shape forming moulds, and mechanical parts which need good wear resistance and corrosion resistance.
Coating |
Hardness(HV) |
Coefficient of friction |
Internal stress |
Processing temperature℃ |
Antioxidant temperature ℃ |
Thickness of coating(μ m) |
Color of coating |
Chrome nitride(CrN) |
1700~2100 |
0.3 |
-1.5 |
400 |
700 |
1~5 |
silvery white |
The comparation of chemical plating Cr, PVD CrN and PVD TiN on moulds:
Coatings |
PVD CrN |
chemical plating Cr |
PVD TiN |
Thickness(
μm) |
2-10 |
20-50 |
2-10 |
Hardness(HV) |
1700-2100 |
750-1000 |
2000-2400 |
Antioxidant temperature |
800 ℃ |
----- |
500 ℃ |
Acid crossion resistance |
excellent |
bad |
bad |
Stripping ability |
excellent |
ordinary |
ordinary |
Lifetime(take shape forming mould as an example) |
350,000 times |
100,000 times |
180,000 times |
The example of CrN applied on moulds:
Applied moulds |
Hardness of material |
Thickness of CrN (um) |
Processed material |
Thickness of processed material (mm) |
Roughness of the surface of the product(Ra) |
Temperature of the product(℃) |
Lifetime improved
(times) |
Aluminium alloy founded mould |
AISIH11/HRC52 |
5.5 |
silicon aluminum alloy |
forming by found |
0.25 |
720 |
2 |
forming/cutted mixed mould |
DINX210CrN12/HRC60 |
4.5 |
corssion resistance low carbon alloy stainless steel panel |
0.5 |
0.40 |
50 |
3.5 |
forming by cold processing / deep pump mixed mould |
AISID3/HRC60 |
5.5 |
low carbon alloy steel panel |
1.0 |
0.40 |
50 |
6 |
automatically gradually going deep pump mixed mould |
AISID2/HRC62 |
4.0 |
DIN 1624 steel panel |
0.2 |
0.06 |
120 |
5 |
mould forming by cold processing |
HSS/HRC62 |
4.0 |
stainless steel panel |
1.5 |
0.10 |
50 |
4 |
mould forming by cold processing /deep pump mixed |
AISID3/HRC62 |
5.5 |
low carbon alloy steel panel |
0.5 |
0.10 |
70 |
4.5 |
