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Method for determining quality of coat

A quality judgment and coating technology, which is applied in the field of evaluating the coating quality of coated sheets, can solve problems such as large differences in evaluation results and difficult comparisons

Inactive Publication Date: 2007-07-25
INST OF MECHANICS - CHINESE ACAD OF SCI
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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

Method used

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  • Method for determining quality of coat

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Embodiment Construction

[0012] Concrete operating steps of the present invention are as follows:

[0013] 1) Perform uniaxial tension on the sample (1mm thick hot-dip galvanized sheet) on a tension and compression testing machine;

[0014] 2) When stretching to 3100N, carry out load protection, and measure the cross-sectional area of ​​the sample to obtain the tensile or compressive stress at this time;

[0015] 3) In the process of load preservation, the scratch tester performs multi-point vertical compressive stress loading on the parallel section of the specimen. The loads are: 30N, 50N, 70N, 90N, 110N, 130N, 150N, 170N, 190N, point by point The distance between them is 5mm;

[0016] 4) After pressing, remove the tensile load, and record the tensile stress and vertical compressive stress at the coating failure point through the system microscopic imaging system;

[0017] 5) Repeat the above steps to obtain the tensile stress and vertical compressive stress data of the sample under the tensile fo...

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Abstract

A method for judging quality of coated layer includes carrying out conventional single-direction of tensile or compression plasticity deformation test on test-piece by tester, holding load to measure section area of test-piece when tensile or compression is on certain degree, using impression tester to make multipoint vertical pressure stress load on coated layer surface at parallel section on test-piece under condition of load-holding, releasing all loads off and using micro-imaging unit to judge out destroying point of tensile or compression stress and vertical pressure stress on coated layer.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04G01N3/00
Inventor 陈光南张凯罗耕星张坤
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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