If you want to know if the coating thickness gauge can measure the thickness of the zinc layer, you first need to understand the measurement principle of the zinc coating thickness measuring instrument. At present, most coating thickness gauge use the principle of magnetic measurement and the principle of eddy current measurement.
1. What is the principle of magnetic measurement?
The principle of magnetic measurement is to measure the thickness of the coating by using the magnetic flux of the probe flowing through the non-ferromagnetic coating into the iron substrate. The thicker the coating, the smaller the magnetic flux. Because this measurement principle must be based on a magnetic metal as the measurement matrix. Therefore, this measurement method is suitable for thickness measurement of a non-magnetic coating on a ferromagnetic metal substrate such as steel or iron.
2. What is the principle of eddy current measurement?
The principle of eddy current measurement means that when the probe is close to the conductive metal, the high-frequency alternating current signal generates a magnetic field in the probe coil, and a vortex is formed therein. The closer the probe is to the conductive substrate, the greater the resistance and the greater the vortex. In this way, the distance between the probe and the collective metal is measured, that is, the thickness of the non-conductive coating on the conductive substrate.
3. What is magnetic?
The property of a mineral to be attracted or repelled by an external magnetic field is called magnetism. Magnetic metals generally include iron cobalt nickel manganese. Except these metals, most other metals are not magnetic metals, such as copper aluminum magnesium zinc.
Therefore, determining whether a zinc coating thickness measuring instrument can measure the thickness of the zinc layer depends on its measurement principle. The zinc coating thickness measuring instrument of the eddy current measurement principle can measure the thickness of the zinc layer. If it is a coating thickness gauge using the principle of magnetic measurement, the thickness of the zinc layer cannot be measured.
When choosing a zinc coating thickness measuring instrument, we recommend the use of Linshang coating thickness gauge, because Linshang zinc coating thickness measuring instrument uses both magnetic and eddy current measurement principles. And the instrument has the function of automatically identifying the substrate, and can switch the measurement mode freely, greatly reducing the preparation work before the measurement.