Method for testing thickness of paint film of automobile multi-coating paint part

Abstract

The invention discloses a method for testing thickness of a paint film of an automobile multi-coating paint part. The method comprises the following steps: taking blocks, cutting off test blocks froma sample plate to be tested by using a press machine, and numbering the test blocks in sequence; preparing sheets, trimming the test blocks by using a slicing machine until the edges are flat, slicingand numbering, and sequentially adhering the slices to a glass slide; coating colors, coating the slices with a pen with a color difference which is large for the color of the adjacent two coatings which is the same or close to the color of the adjacent two coatings, and wiping the surface of the sample sheet with wiping cloth dipped with an organic reagent; measuring, putting the glass slide onan optical microscope to observe and measure the thickness of the paint film. Through ingenious design, by utilizing the principle of similarity and intermiscibility, due to the fact that other expensive equipment or chemical corrosive liquid and the like are not used, the cost and the time can be saved, the marking pen or the oily pen, ethanol, acetone and the like are common products, taking andoperation are convenient, the technical problem that the adjacent film layers cannot be layered due to the fact that the colors of the adjacent film layers are the same or close to the color of the adjacent film layers under a common optical microscope is solved, and the method is easy and convenient to operate, simple and practical.

Description

technical field [0001] The invention relates to the technical field of new material analysis and testing, in particular to a method for testing the paint film thickness of automobile multi-coat paint parts. Background technique [0002] With the development of the automobile industry, the requirements for all aspects of the automobile are becoming more and more refined, especially the demand for spraying technology on the surface of the automobile. [0003] During the spraying process of automobiles, the control of the film thickness of each coating has a great influence on the final color and performance of the coating. Among the existing film thickness test methods, the optical microscope test method is widely applicable, easy to operate, and intuitive to image. , The measurement is accurate and widely used, and the optical test method after section cutting is also considered as the arbitration method. [0004] With the increasingly higher requirements for the appearance ...

AI Technical Summary

Problems solved by technology

[0004] With the increasingly higher requirements for the appearance of existing cars, the requirements for the spraying performance of body exterior parts are becoming more and more stringent. In addition to the traditional three-coat spraying, four-coat and five-coat spraying have also begun to be applied. There will be more and more phenomena of the same or similar colors of adjacent coatings, such as the situation of spraying white paint after white primer, which is very difficult to distinguish the boundary line of the film layer under the optical microscope, and it is very difficult to detect the film thickness of each layer. Work poses very great difficulties, even undetectable

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