Problems often encountered when using coating thickness gauge probes
When repairing the coating thickness gauge probe, it is often found that the magnetic core is severely worn, and some can be said to be seriously damaged. For example, the gem core of the N1 head is often damaged and chipped, and the arc core of the F1 head magnetic core is flattened or deformed.
First of all, it is normal for the probe to be worn during use. But if the user pays attention according to its characteristics, its service life will be extended.
A common problem is that when measuring, since the test is usually done downward, the user often presses downward harder, which can easily cause the failure of the probe core over time. The correct way to use it is to gently press the probe against the measured surface when it is one centimeter away from the workpiece to be measured. Because the probe has a built-in induction pressure spring during design, you only need to press it gently. Another point is that during repeated movement of the probe, it is easy to bump, collide, and collide with other objects, and it is also easy to cause damage to the probe. Therefore, if the working conditions permit, the probe can be fixed and the workpiece to be measured can be brought into contact with the probe, thereby Reduce probe collision.
In another case, when measuring, whenever you measure a point, you must lift the probe and not pull it flat to reduce core wear.
Finally, the probe must be kept away from strong magnetic fields to avoid changing the natural frequency of the probe and causing it to fail to work. Correct operation and use extend the service life of the instrument.
The covering layer formed to protect and decorate the surface 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 quality inspection in the processing industry and surface engineering, and is an essential means for products to meet excellent quality standards. In order to internationalize products, my country's export commodities and foreign-related projects have clear requirements for the thickness of the coating.
The main methods for measuring coating thickness include: wedge cutting method, light interception method, electrolysis method, thickness difference measurement method, weighing method, X-ray fluorescence method, β-ray backscattering method, capacitance method, magnetic measurement method and eddy current measurement Law etc. The first five of these methods are destructive testing. The measurement methods are cumbersome and slow, and they are mostly suitable for sampling inspection.
X-ray and β-ray methods are non-contact and non-destructive measurements, but the devices are complex 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 coatings, double coatings, and alloy coatings. The β-ray method is suitable for measurement of coatings and coatings with substrate atomic numbers greater than 3. The capacitance method is only used when measuring the thickness of insulating coatings on thin conductors.
