Detection method for measuring thicknesses of multiple coating layers

Abstract

The invention belongs to the technical field of detection on automobile parts, and provides a detection method for measuring thicknesses of multiple coating layers. The detection method comprises the following steps: cutting a sample part to be detected, burnishing vertically to the cross section of a sample, properly polishing the sample, putting the sample on a measuring table of a microscope, regulating the amplification factor of the microscope, observing under the 100-1000-fold microscope, observing by adding a cold light source on the side surface of the sample to be detected, and measuring the thicknesses of the coating layers at the same time. The detection method has the advantages as follows: by varying the light line and the light intensity of the microscope, a layering problem of the coating layers with similar colors, such as an ED layer and a primer layer, white paint and varnish as well as black finishing paint and varnish, can be effectively solved, thus avoiding a special sampling cumbersome procedure in the production process; the detection method is accurate in detection and high in reliability; a reliable basis is provided for routine detection and defect analysis of metal and plastic coating products.

Description

technical field [0001] The invention belongs to the technical field of detection of auto parts products, and relates to a detection method for measuring the thickness of a multilayer coating by changing the light source, light path and intensity of a microscope. Background technique [0002] Coating is an effective means of plastic and metal protection. A good coating thickness has a key impact on the weather resistance and moisture resistance of the product. At present, most of the coating process is 3C1B or 3C2B process. The paint and varnish are wet-sprayed in the production process. After this process is dried to form a film, it is difficult to delaminate, and it is impossible to effectively determine the color of the paint and varnish. Thickness and the thickness of ED and primer. At present, the thickness of different paint layers can only be measured by drying after spraying the color paint or spraying separately, which makes the production process not continuous and ...

AI Technical Summary

Problems solved by technology

At present, most of the coating process is 3C1B or 3C2B process. The paint and varnish are wet-sprayed in the production process. After this process is dried and formed into a film, it is difficult to separate layers, and it is impossible to effectively determine the color of the paint and varnish. Thickness and the thickness of ED and primer. At present, the thickness of different paint layers can only be measured by drying after paint spraying or spraying alone, which makes the production process not continuous and cumbersome. The existing technology uses an improved microscope to directly distinguish and measure ED. layer, primer, basecoat, and varnish thickness, and existing microscopes, whether in brightfield or darkfield, cannot effectively distinguish between different coatings, especially paint layers with similar colors, such as varnish and basecoat, ED and primer , primers and paints, etc.

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