Coating Thickness Gauge Measure the Galvanized Layer

From:Linshang Time:2020/02/02 11:00:00 Browse:182
In the metal coating processing industry, in order to evaluate the coating thickness of products, a coating thickness gauge is often used. This article mainly describes the measurement range of the coating thickness gauge.

How thick can the coating thickness gauge be?

Different coating thickness gauges have different measurement intervals due to different applied measuring principles. Generally speaking, the unit of measurement value of the coating thickness gauge on the market is micrometer. The measuring range of different brands and models ranges from 0 to 1250 μm and 0 to 2000 μm.

Many coating thickness gauges use magnetic thickness measurement and eddy current thickness measurement.

Magnetic thickness measurement method: suitable for non-magnetic layer thickness measurement on magnetically permeable materials. For example, the substrate is steel ,iron,silver,nickel, and the surface coating is zinc plating, copper plating, chrome plating, rubber, paint, etc.

Eddy current thickness measurement method: suitable for non-conductive layer thickness measurement on conductive metal. For example, the substrate is copper, aluminum, zinc, tin, and the surface is covered with enamel, rubber, paint, plastic, etc.

Compared with the two, the measurement accuracy of the magnetic thickness method will be higher. Users can choose different thickness gauges according to measurement needs. Magnetic thickness gauges and eddy current thickness gauges generally measure thicknesses of 0-5 mm. These instruments are divided into a probe and the host integrated type, the probe and the host separated type, the former Easy to operate, the latter is suitable for measuring non-planar shapes. Thicker dense materials need to be measured with an ultrasonic thickness gauge, and the measured thickness can reach 0.7-250 mm.

Can the coating thickness gauge measure the galvanized layer?

For coating thickness gauges, depending on the applicable measuring principle, the coating range suitable for different measurement methods is different, and the accuracy of the measurement is also different.

Three coating thickness gauges independently developed by Linshang Technology have the same accuracy as the Qnix, and it is the most accurate instrument among domestic coating thickness gauges. LS221 and LS223 two coating thickness gauges are externally connected, suitable for narrow test environments. The probe can be inserted into the test point for testing.

Conventional coating thickness gauges on the market measure the distance between the middle probe of the probe and the underlying metal substrate, so a metal substrate is required. Iron-based probes can measure paint, galvanized, chrome, fireproof, and anticorrosive coatings on magnetic materials (steel). Or smooth the iron-based block in the following way, and measure the film and paper. (The base material is magnetically permeable, the coating cannot be magnetically permeable)

For example, this coating thickness gauge cannot be used if the surface of the plastic product is galvanized. If the surface of the iron plate is galvanized, you can use this coating thickness gauge to measure.

If you need to measure the galvanized layer (or other coatings) on the surface of plastics and wooden boards, the ultrasonic thickness measurement method will be used. Thickness gauges are generally expensive.

Taken together, the conventional iron-based coating thickness gauge can measure the galvanized layer on the surface of magnetic materials.

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