Method for measuring the coating amount of insulating coating on the surface of electrical steel

Abstract

The invention discloses a coating amount measuring method of an electrical steel surface insulating coating. The electrical steel surface insulating coating contains a characteristic element, the characteristic element does not exist in an electrical steel substrate or the content is quite small, and the element has a remarkable and stable X ray characteristic spectral line and is not easily interfered by other element spectral lines. The method is characterized by comprising the following steps: 1), selecting the characteristic element; 2), preparing a standard sample; 3), establishing an analysis curvilinear equation; and 4), measuring the coating amount of the electrical steel surface insulating coating of an actual sample. According to the method provided by the invention, sample preparation is unnecessary, the coating amount distribution situation of the whole electrical steel surface insulating coating can be fully scanned in a stepping manner in a plate width direction, the coating control is more accurate, the sample preparation link and the detection time are reduced, the examination period is shortened, timely data is provided for the control of coating quality, and the method has great guidance significance for actual production.

Description

technical field [0001] The invention belongs to the technical field of coating thickness measurement, in particular to a method for measuring the coating amount of an insulating coating on the surface of electrical steel. Background technique [0002] The only way to measure the surface coating thickness of electrical steel is through sensors installed on the upper and lower surfaces of the strip at the exit of the drying furnace. Under normal circumstances, the sensor is made using near-infrared spectroscopy technology, such as the patent application "Near-infrared spectroscopy detection method for silicon steel insulation coating thickness" (application number: 200910227832.6), which uses sensors made of infrared spectroscopy to measure; there are also applications The pulse method, such as the patent application "Metal Surface Coating Quality Detection Method" (application number: 95110206.0), utilizes sound pulses to analyze the metal surface coating spectrum. [0003] ...

AI Technical Summary

Problems solved by technology

The patent of using X-rays to measure the coating amount on the surface of electrical steel is "On-line detection method of chrome-free coating thickness on strip steel surface" (Patent No. 201010561145). This method needs to add two elements with different ray intensity to measure the thickness Correct the measured thickness, the method is more cumbersome

In addition, the general X-ray measuring instruments on the market basically use disc samples with a diameter of 50mm, which can only be controlled offline by taking representative samples from different parts of the steel plate. This method is not representative and cannot accurately reflect the entire plate width. The change of the coating amount fluctuates, but the present invention can take point measurements at random in the direction of the plate width, and the measurement area is larger. Fluctuations in layer thickness are visualized as

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