The working principle of coating thickness measuring instrument
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Metal components are widely used in society, and corrosion protection is the protective layer of metal components, it also determines the service life of metal components, therefore, various measures are taken to coat the surface of metal components, in order to improve the safety and reliability of components, aesthetics, and environmental adaptability, extend the service life and other purposes. Effective and high quality coating can protect the body from loss, so the quality detection of coating is particularly important, among which the coating thickness is an important indicator of the coating of metal components. In the detection of highway engineering, the coating thickness of bridge expansion device, bridge steel structure and traffic safety facilities, such as signs, guardrail and isolation grid should be measured. The coating thickness gauge can accurately measure the thickness to determine the quality of the coating.
So the coating thickness instrument for the production factory, can adjust the thickness through measurement, control the generation cost, and for the demand side, is to control the quality of the judgment based on the instrument, then the coating thickness instrument is what is its principle, reliable?
The thickness measurement methods of coating thickness measuring instrument include: magnetic method, eddy current method, mechanical method, microscope method, gravimetric method, optical method and ultrasonic method, among which magnetic and eddy current two schemes are the most widespread, the following focuses on the principle of magnetic and eddy current effect coating thickness measuring instrument.
Working principle of magnetic coating thickness measuring instrument
Magnetic method is a non-destructive test of coating thickness measurement method, that is, using the principle of magnetic induction, the size of the tunnel from the magnetic head through the non-iron coating into the ferromagnetic matrix, to determine that the instrument contains magnets. When the side head containing magnets is in contact with the coating, the head and the magnetic metal matrix form a closed magnetic circuit. Due to the existence of non-magnetic covering layer, the magnetic circuit reluctance changes. The larger the reluctance, the smaller the flux, and the thickness of the covering layer can be calculated by measuring its change.
Magnetic freeze is used to measure the thickness of non-magnetic coating on magnetic metal substrate. Magnetic material mainly refers to the material that can directly or indirectly produce magnetism by excessive elements such as iron, cobalt, nickel and their alloys, such as steel, iron, alloy and hard magnetic steel as magnetic metal matrix; Such as aluminum, chrome, copper, glass, rubber, paint and other non-magnetic covering layer. Therefore, the magnetic coating side thickness instrument can be used to measure the paint layer, plastic, rubber coating on the surface of steel, as well as non-ferrous metal electroplating of nichrome metal. It is widely used to measure the coating thickness of steel components in engineering
summarize
It is of great significance to effectively control the thickness of the coating. Small thickness of the coating may lead to defects in the appearance of the coating, and then affect the chromaticity performance of the coating, resulting in color difference and other phenomena; The thickness of coating is too large, which is not conducive to saving paint and controlling cost. At the same time, environmental protection and energy saving put forward higher requirements for the coating process, not only to ensure the coating quality is stable and reliable, but also to achieve the goal of green environmental protection.
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