Method for determining quality of coat

Abstract

The invention discloses a method for judging the comprehensive performance of coating quality, which comprises the following steps: 1) conducting conventional plastic deformation tests such as unidirectional tension or compression on a test piece on a tension-compression testing machine in a test system; 2) when stretching or compress to a certain extent, carry out load preservation, and measure the cross-sectional area of ​​the sample; 3) through the indentation tester integrated in the system, perform semi-automatic multi-point vertical compressive stress on the coating surface of the parallel section of the specimen while maintaining the load 4) After the indentation instrument is finished working, the system automatically removes the tensile or compressive load, and judges and records the tensile or compressive stress at the coating failure point and the vertical compressive stress through the microscopic imaging equipment that comes with the system. stress. The invention obtains the failure mechanism relationship curve of the sample coating by carrying out tension or compression on the integrated test system while maintaining the load of the sample, and carrying out vertical compressive stress or frictional loading, so that it can be comprehensive and practical. To evaluate the surface coating quality of materials.

Description

technical field [0001] The invention relates to a method for evaluating the coating quality of a coated sheet. Background technique [0002] In the evaluation of the coating quality of coated sheets (such as galvanized sheets), there have been many methods coexisting, and these evaluation methods are obtained by applying different loads to the material to obtain the evaluation results. This leads to the use of different test methods for the same kind of coated sheet, and the evaluation results obtained are very different, and it is not easy to compare. In addition, the existing test methods can only test the quality of the coating under a single load, such as the normal pressure of the coating surface, the friction of the coating surface, the cross-sectional shear force generated by various plastic deformations, corrosion stress and impact force and other loads, and the coated sheet material is often a combination of multiple loads in the actual use (stamping forming) proce...

AI Technical Summary

Problems solved by technology

This has led to the use of different test methods for the same coated sheet, and the evaluation results obtained are very different, and it is not easy to compare

In addition, the existing test methods can only test the quality of the coating under a single load, such as the normal pressure of the coating surface, the friction of the coating surface, the cross-sectional shear force generated by various plastic deformations, corrosion stress and impact force and other loads, and the coated sheet material is often a combination of multiple loads in the actual use (stamping forming) process, so if you want to truly reflect the quality of the coating in the actual use process, you must simulate the actual state, that is, the comprehensive multi- Evaluate and judge various loads

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