Introduction of five types of coating thickness gauges
Coating thickness gauges generally have the following five types according to the measurement principle:
1. Magnetic thickness measurement method: It is suitable for the thickness measurement of the non-magnetic layer on the magnetic conductive material. The magnetic conductive material is generally: steel, silver and nickel. This method has high measurement accuracy
2. Eddy current thickness measurement method: suitable for non-conductive layer thickness measurement on conductive metal. This method has lower accuracy than magnetic thickness measurement method
3. Ultrasonic thickness measurement method: At present, this method has not been used to measure the thickness of the coating layer in China. Some foreign manufacturers have such an instrument, which is suitable for the measurement of the thickness of the multi-layer coating layer or when the above two methods cannot be measured. However, it is generally expensive and the measurement accuracy is not high.
4. Electrolytic thickness measurement method: This method is different from the above three methods. It does not belong to non-destructive testing and needs to destroy the coating layer. The general accuracy is not high. It is more troublesome to measure than other types.
5. Radiation thickness measurement method: This kind of instrument is very expensive (generally more than 100,000 RMB), and is suitable for some special occasions.
