Q & A


Q & A

Q & A related to coating processing

2022-04-24 11:33

1. How to treat the coating of non working surface?

For the non working face, generally, there is no protection treatment, and the coating quality is not controlled. Only the coating quality of the workpiece surface needs to be guaranteed. If customers need to protect the non working surface, they need to customize special fixtures for protection. In addition to increasing the cost of fixtures, the coating cost will also increase due to the existence of fixtures. In general, the thickness of the coating is not enough to affect the actual assembly or use of the workpiece.

2. Will the workpiece be coated immediately after delivery?

After receiving the workpiece, our company needs to classify the workpiece. In addition to the pretreatment of the workpiece, we also need to use different processes for production according to the use of the workpiece, because it is impossible to coat immediately. The normal delivery period is 4 ~ 5 working days.

3. Are the same coatings produced in the same furnace for different types of workpieces?

The coating is not universal. For a simple example, the actual composition of tin titanium nitride is the value of tixny, X and Y. different X and Y values need to be selected according to the material, surface processing and use of the workpiece. If the X and Y values are different, they cannot be produced in the same furnace. If the choice is wrong, the coating will not only fail to work, but also may bring reaction.

4. Is the bonding force bad when the coating process temperature is low?

Our independent international patent coating technology breaks this traditional concept. In the low-temperature coating process, better adhesion is obtained than that in the high-temperature coating process.

5. What are the benefits of low temperature PVD process?

The low-temperature PVD process can select a wider range of substrates and reduce the impact of PVD process on substrates, such as low-temperature tempering, workpiece deformation, etc.

6. What are the requirements of PVD process for workpiece surface?

Generally, the roughness of workpiece surface is required to be less than Ra0 6. If the surface is too rough, the adhesion of the coating will be reduced and the coating will be easy to peel off.

7. Is post coating treatment required after PVD coating?

According to the application occasions of different workpieces, after PVD coating is completed, our company uses different methods to carry out post-treatment on the coating.

8. What is the difference between PVD method and electroplating?

The hardness of electrodeposited coating is low, usually HV is between 600 ~ 700, and electroplating can play a functional role only if it is more than 10um thick. PVD coating is usually only 2 ~ 4um, and the hardness HV should reach more than 2000. PVD method is environment-friendly without any pollution, but the cost of PVD coating is higher than that of electroplating.

9. Why is there no change in HRC hardness after PVD treatment compared with that before coating?

PVD coating has high hardness and thin coating. According to the national standard, when the coating thickness reaches more than 10um, Vickers hardness tester can be used to measure the Vickers hardness of coating surface film. If it is less than 10um, nano hardness tester must be used to measure the hardness of coating surface. However, the surface hardness of the coating must not be measured by Rockwell hardness tester. Rockwell hardness only measures the hardness of the workpiece substrate.