Magnetic thickness gauge using magnetic method, which is mainly used to measure the thickness of non-magnetic metal coatings on magnetic metal substrates. But what are the magnetic metals and how does the instrument use it to complete the test? Linshang Technology, as a coating thickness gauge manufacturer will answer your questions.
In short, magnetic metal refers to the metal that we often contacted when we were young. It can be adsorbed by magnetite, but only iron is common in common metals. What other metals can be classified as magnetic metals?
They can be divided into diamagnetic substances, paramagnetic substances and ferromagnetic substances according to their influence on the magnetic field after magnetization. We often say that magnetic metal refers to the last category: ferromagnetic substances. Ferromagnetic substances can strongly increase the magnetic field. The other two diamagnetic and paramagnetic substances weaken or slightly increase the magnetic field. They are also called non-ferromagnetic substances and most metals are non-ferromagnetic substances.
The magnetic properties of metals are determined by their atomic structural properties. Common diamagnetic metals are mainly copper (Cu), silver (Ag), gold (Au), tin (Sn), etc., while paramagnetic metals are mainly lithium (Li), aluminum (Al), magnesium (Mg), etc. Ferromagnetic metals include iron (Fe), cobalt (Co) and nickel (Ni).
The metal substrate that can be measured by the magnetic thickness gauge mainly refers to the above-mentioned three ferromagnetic metals, iron, cobalt and nickel. In addition to some steels, some are also magnetic, mainly horse-type stainless steel (mainly 403, 410, 414, 416, 416, 420, 430, 431, 440A, 440B, and 440C). Non-magnetic metal coatings on these ferromagnetic metal substrates can be measured with a magnetic thickness gauge.
Ferromagnetic metals are very different from non-ferromagnetic metals. Therefore, special magnetic thickness gauges should be used when measuring the coating thickness on ferromagnetic metal substrates, but there are currently some coating thickness gauges that can measure simultaneously two types of metal substrates, such as coating thickness gauge LS220H. Thid dual use coating thickness gauge have been widely praised in the industry for their convenience and speed.