In the fields of aerospace, automotive manufacturing, bridge construction, etc., coatings are the "invisible armor" that protects substrates and extends their service life. However, uneven or too thin coating thickness may cause corrosion, wear, and even structural failure. As a standard brand in the field of coating testing, the British Yigao Coating Thickness Gauge, with the dual technology of magnetic attraction principle and eddy current principle, has achieved fast, non-destructive, and high-precision measurement of non-magnetic/magnetic coatings on metal substrates, becoming the "gold standard" for industrial quality inspection.

　　1、 Principle of magnetic attraction: "Magnetic ruler" of ferromagnetic substrate

When detecting non-magnetic coatings (such as paint and galvanized layers) on ferromagnetic substrates such as steel, the Yigao thickness gauge uses a constant magnetic attraction method: the magnet inside the probe generates magnetic attraction with the substrate, and an increase in coating thickness weakens the magnetic force, resulting in displacement changes between the magnet and the Hall sensor. The instrument converts displacement into coating thickness values through algorithms, with a measurement range of 0-2500 μ m and an accuracy of ± 1 μ m.

Technical advantages:

1. Strong anti-interference ability: The magnetic circuit design can shield external magnetic fields, ensuring data stability;

2. Wide applicability: can cover from thin coatings (such as automotive electrophoretic paint) to thick coatings (such as ship rust proof paint);

3. Convenient operation: The probe can be vertically pressed with one hand, and the result will be displayed within 3 seconds.

A certain automobile factory applied the Yigao magnetic suction thickness gauge to test the electrophoretic paint on the car body, and found that the error rate of traditional manual sampling was as high as 15%. However, the instrument detection controlled the error within ± 2 μ m, significantly improving the consistency of anti-corrosion performance.

　　2、 Eddy current principle: "electromagnetic probe" for non-magnetic substrates

For insulation coatings (such as anodized films and powder coatings) on non ferromagnetic substrates such as aluminum and copper, the thickness gauge can switch to high-frequency eddy current mode: the coil inside the probe is fed with high-frequency alternating current, generating an eddy current magnetic field on the surface of the substrate. The change in coating thickness will change the eddy current intensity, thereby affecting the coil impedance. The instrument measures impedance changes and infers coating thickness with a resolution of up to 0.1 μ m.

Technological breakthrough:

1. High frequency compensation technology: eliminates the influence of substrate conductivity fluctuations on measurement, ensuring accuracy on different materials such as aluminum alloys and magnesium alloys;

2. Surface adaptive algorithm: automatically corrects edge effect errors for complex shapes such as pipelines and surface parts;

3. Dual frequency detection function: Simultaneously output low-frequency (strong penetration) and high-frequency (high resolution) data, meeting the detection needs of thick coatings and micro nano coatings.

A certain aerospace company used an Easy Eddy Current Thickness Gauge to test the coating of aircraft skin and found that it could accurately identify coating thinning defects at the 0.5 μ m level, providing critical data support for flight safety.

　　3、 Dual principle fusion: from "single detection" to "full scene coverage"

The latest generation of British Yigao Coating Thickness Gauge innovatively integrates magnetic attraction eddy current dual probes, allowing users to automatically identify substrate types and switch detection modes without the need to replace equipment. For example, when detecting galvanized steel plates, the instrument can first measure the thickness of the galvanized layer through magnetic attraction method, and then detect the surface paint layer through eddy current method, achieving full chain thickness monitoring of the "substrate intermediate layer surface layer".

In addition, the instrument is equipped with Bluetooth connection and data analysis software, which can generate thermal maps of coating thickness distribution, helping users quickly locate process defects (such as uneven spraying and missed coating), and improving quality inspection efficiency by more than 50%.

From steel structures to precision electronics, the UK's YiGao coating thickness gauge redefines the accuracy and boundaries of coating detection through the "dual core drive" of magnetic attraction and eddy current. It is not only an "intelligent assistant" for quality inspectors, but also an "invisible driving force" that promotes the evolution of industrial coating technology towards high reliability and long life - behind the "thickness code" of each layer of coating, there is a deep dialogue between technology and quality.