Overview of Coating Thickness Gauges
It can non-destructively measure the thickness of non-magnetic coatings (such as aluminum, chromium, copper, enamel, rubber, paint, etc.) on magnetic metal substrates (such as steel, iron, alloys and hard magnetic steel, etc.) and non-magnetic metal substrates (such as copper , aluminum, zinc, tin, etc.) on the non-conductive coating (such as: enamel, rubber, paint, plastic, etc.). Coating thickness gauge has the characteristics of small measurement error, high reliability, good stability and easy operation. It is an indispensable testing instrument for controlling and ensuring product quality. It is widely used in manufacturing, metal processing industry, chemical industry, Commodity inspection and other inspection fields.
The iron/non-ferrous coating thickness gauge uses a magnetic sensor to measure non-ferromagnetic coatings and coatings on steel, iron and other ferromagnetic metal substrates, such as: paint, powder, plastic, rubber, synthetic materials, phosphated layers , chromium, zinc, lead, aluminum, tin, cadmium, porcelain, enamel, oxide layer, etc. Use eddy current sensors to measure enamel, rubber, paint, plastic layers, etc. on copper, aluminum, zinc, tin and other substrates. It is widely used in manufacturing, metal processing industry, chemical industry, commodity inspection and other testing fields. Coating thickness gauges generally have the following five types according to the measurement principle:
Magnetic thickness measurement method
It is suitable for measuring the thickness of non-magnetic layer on magnetically permeable materials. Magnetic permeable materials are generally: steel\iron\silver\nickel. This method has high measurement accuracy.
Eddy current thickness measurement method
It is suitable for measuring the thickness of non-conductive layers on conductive metals. This method is less accurate than the magnetic thickness measurement method.
Ultrasonic thickness measurement method
At present, this method is not used to measure the thickness of coatings in China. Some foreign manufacturers have such instruments, which are suitable for measuring the thickness of multi-layer coatings or when neither of the above two methods can be measured. However, they are generally expensive and have poor measurement accuracy. Not high either.
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. Generally, the accuracy is not high. It is more troublesome to measure than the other methods.
Radiation thickness measurement
This kind of instrument is very expensive (generally more than 100,000 RMB) and is suitable for some special occasions.
