It is understood that the coating layer formed on the surface protection and decoration of the material, such as coating, plating, coating, lamination, chemically formed film, etc., is called coating in relevant national and international standards.
Coating thickness measurement has become an important part of the processing industry and surface engineering quality testing, and is an indispensable means for products to achieve superior quality standards. In order to internationalize the products, China's export commodities and foreign-related projects have clear requirements for the thickness of the coating.
Coating thickness measurement methods include: wedge cutting method, optical cutting method, electrolysis method, thickness difference measurement method, weighing method, X-ray fluorescence method, Î²-ray back scattering method, capacitance method, magnetic measurement method and eddy current measurement. Law and so on. The first five of these methods are lossy detection, and the measurement methods are cumbersome and slow, and are more suitable for sampling inspection.
The X-ray and beta-ray methods are non-contact non-destructive measurements, but the device is complicated and expensive, and the measurement range is small. Due to the presence of radioactive sources, users must comply with radiation protection regulations. The X-ray method can measure extremely thin plating, double plating, and alloy plating. The beta ray method is suitable for coatings with coatings and substrates with an atomic number greater than 3. The capacitance method is used only when thickness measurement is applied to the insulating coating of a thin conductor.
With the advancement of technology, especially after the introduction of microcomputer technology in recent years, the thickness gauges using magnetic method and eddy current method have taken a step toward micro, intelligent, multifunctional, high-precision and practical. The resolution of the measurement has reached 0.1 micron, and the precision can reach 1%, which has been greatly improved. It has a wide range of applications, wide measuring range, easy operation and low cost. It is the most widely used thickness measuring instrument for industrial and scientific research.
The non-destructive method does not damage the coating or damage the substrate, and the detection speed is fast, so that a large amount of inspection work can be carried out economically.
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Label: Principle of a conventional coating thickness gauge
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