Study on Coating Thickness with Coating Thickness Gauge

  The surface coating is more and more widely used. For example, automobile surface, anticorrosive coating, fireproof coating, surface decoration, etc. Therefore, coating thickness has become an important part of the quality inspection in the surface coating industry. It is also an important part of the product to achieve high quality. Because the surface coating thickness is uneven or too thick or too thin, it will more or less affect the performance of the surface coating product. Coating products with different properties are only comparable under the same coating thickness. Therefore, we generally use a coating thickness gauge or other coating thickness measurement methods to detect coating thickness.

1. The measurement principle of coating thickness gauge

 The common measuring principles of coating thickness gauges include magnetic working principle, eddy current measuring principle, magnetic induction measuring principle, lever micrometer measuring principle, etc. The principle of magnetic measurement is mainly to measure the non-magnetic coating thickness on magnetic metal substrates using magnetic induction measurement methods. The principle of eddy current measurement refers to the probe to generate a high-frequency electromagnetic field and then to generate eddy current on the coating. Determine coating thickness based on the size of the eddy current.
      The magnetic method uses the amount of magnetic flux generated when passing through a non-magnetic coating to determine coating thickness. The measuring principle of the lever micrometer is to measure the thickness of the sample when the coating is not applied. After the coating is applied, the coating film is dried and the coating thickness is measured. The coating thickness value is subtracted from the sample thickness without the coating. That is the coating thickness value.

2. Method for determination of coating thickness

There are many methods for measuring coating thickness. From the coating state, it is mainly divided into dry film measurement method and wet film measurement method. Below we focus on the dry film measurement method. The measurement methods of dry film thickness are mainly: magnetic method, eddy current method, capacitance method, X-ray fluorescence method, β-ray backscatter method, weighing method, thickness difference method, electrolytic method, light interception method and tapered cutting method. Among these measurement methods, the first several are non-destructive and the latter are non-destructive. Nondestructive measurement methods are commonly used in portable coating thickness gauges.
      With the development of science and technology, after the introduction of microcomputer technology, coating thickness gauges using magnetic and eddy current methods have gradually developed towards high precision, multi-function, practicality and portability.

3. Measure the coating thickness with a coating thickness gauge

  Coating thickness gauge is recommended for coating thickness measurement. Each coating thickness gauge of Linshang Technology adopts the thickness measurement principle of magnetic method and eddy current method. There are integrated type and split type. Wide range coating thickness gage for fire and corrosion resistant coatings. Users can choose according to their needs. So what's the point of using coating thickness gauge to measure coating thickness and control it?

(1) It can prevent coating defects caused by uneven coating thickness.

(2)The appearance index of the whole coating can be adjusted.

(3) The cost of coating materials can be controlled.
Those who are engaged in the coating industry will often use coating thickness gauges. Below we say a few precautions when measuring coating thickness. We hope to help you better with your coating measurements. When using a coating thickness gauge equipped with a dry battery, the unstable voltage will affect the measurement result and the battery must be replaced in time. When using magnetic and eddy current coating thickness gauges, keep them away from strong magnetic fields, and do not place the probe too close to the metal when starting up.