Working principle of coating thickness gauge
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Metal components are widely used in society, and anti-corrosion is the protective layer of metal components, which also determines the service life of metal components. Therefore, various measures are taken to coat the surface of metal components to improve their safety, reliability, aesthetics, adaptability to the environment, and extend their service life. Effective and high-quality coatings are essential for protecting the body from damage, therefore quality inspection of coatings is particularly important, with coating thickness being an important indicator of metal component coatings. In highway engineering inspection, the coating thickness of bridge expansion devices, bridge steel structures, and traffic safety facilities such as signs, guardrails, and isolation barriers needs to be measured. The coating thickness gauge can accurately measure its thickness to determine the quality of its anti-corrosion layer.
So, for the production factory, the coating thickness gauge can be adjusted through measurement to control the production cost, while for the demand side, it is the instrument for quality control judgment. So, what is the principle of the coating thickness gauge and is it reliable?
The methods for measuring thickness using coating thickness gauges include magnetic method, eddy current method, mechanical method, microscope method, gravimetric analysis method, optical method, and ultrasonic method. Among them, magnetic and eddy current methods are the most widely used. Below, we will focus on the principles of coating thickness gauges based on magnetic and eddy current effects.
Working principle of magnetic coating thickness gauge
Magnetic method is a non-destructive testing method for measuring coating thickness, which uses the principle of magnetic induction to determine the size of the tunneling from the magnetic head through a non-ferrous coating into the ferromagnetic substrate, and to determine the presence of a magnet in the coating display instrument. When the side head containing the magnet contacts the coating, the head and the magnetic metal substrate form a closed magnetic circuit. Due to the presence of a non-magnetic coating layer, the magnetic resistance of the magnetic circuit changes. The larger the magnetic resistance, the smaller the magnetic flux, and the thickness of the coating layer can be calculated by measuring its changes.
Magnetic freezing is used to measure the thickness of non-magnetic coatings on magnetic metal substrates. Magnetic materials mainly refer to substances that can directly or indirectly generate magnetism from excessive elements such as iron, cobalt, nickel, and their alloys, such as steel, iron, alloys, and hard magnetic steel, which are magnetic metal substrates; Non magnetic coatings such as aluminum, chromium, copper, glass, rubber, paint, etc. Therefore, the magnetic coating thickness gauge can be used to measure the paint layer, plastic, rubber coating on the surface of steel, as well as the non-ferrous metal electroplating layer of nickel chromium metal, and is widely used for measuring the coating thickness of steel components in engineering
summary
Effective control of coating thickness is of great significance. If the coating thickness is too small, it may lead to appearance defects of the coating, which in turn affects the chromaticity performance of the coating, resulting in color differences and Fupi phenomena; The coating thickness is too thick, which is not conducive to saving coatings and controlling costs. At the same time, environmental protection and energy conservation have put forward higher requirements for the coating process, ensuring stable and reliable coating quality while achieving the goal of green environmental protection.
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