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Method for testing curing degree of lacquer coat of metal plate

A detection method and metal plate technology, which is applied in the direction of measuring devices, instruments, and material analysis through electromagnetic means, can solve the problems of under-curing, over-curing, and affecting the use of color-coated plates, etc., to achieve accurate detection results and detection The effect of fast speed and convenient detection

Inactive Publication Date: 2009-11-18
林俊明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of processing, the color-coated board is made of a metal plate as the substrate. After surface degreasing, phosphating, chromate, etc., it is coated with an organic coating and baked. The baking process is to make the organic coating harden. On the metal plate, the degree of curing is related to the performance of the color-coated plate. The relationship between the paint layer and the metal plate cannot be over-cured or under-cured. Both over-curing and under-curing will affect the use of the color-coated plate. Now In the prior art, the detection of the degree of curing of the paint layer of the metal plate is relatively complicated, and the degree of curing of the paint layer of the metal plate cannot be tested conveniently, quickly and effectively.

Method used

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  • Method for testing curing degree of lacquer coat of metal plate
  • Method for testing curing degree of lacquer coat of metal plate
  • Method for testing curing degree of lacquer coat of metal plate

Examples

Experimental program
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Embodiment 1

[0035] Example 1, see figure 1 As shown, a method for detecting the degree of curing of a metal plate paint layer of the present invention is used to detect a metal plate with a paint layer on one side. The method includes two processes: calibration and actual measurement:

[0036] In the calibration process, it includes the following steps:

[0037]a. Use two electrodes to replace the eddy current sensor and connect to the eddy current detector. Connect the two electrodes connected to the eddy current detector and the metal plate sample 10 with a known paint curing degree (this time figure 1 The first electrode 21 is in contact with the metal plate body 11 on the side of the metal plate sample 10, and the second electrode 22 is wrapped around the soft body 23 impregnated with conductive liquid. It is in contact with the paint layer 12 of the metal plate sample 10 on the same side; the reason why the soft body 23 impregnated with conductive liquid is used to wrap the second elec...

Embodiment 2

[0048] Example two, see figure 2 As shown, a method for detecting the degree of curing of a metal plate paint layer of the present invention is different from the first embodiment in that in step a, the second electrode 22 is wrapped in a soft body 23 impregnated with a conductive liquid and then The other side is with metal plate sample 10 (at this time figure 2 The metal plate in is in contact with the paint layer 12 of the metal plate sample);

[0049] Correspondingly, in step f, the second electrode 22 is wrapped with a soft body 23 impregnated with conductive liquid and then on the other side is connected with the tested metal plate 10 (at this time figure 2 The metal plate in is in contact with the paint layer 12 of the metal plate under test.

Embodiment 3

[0050] Example three, see image 3 As shown, a method for detecting the degree of curing of a paint layer of a metal plate of the present invention is used to detect a metal plate with a paint layer on both sides. The method includes two processes: calibration and actual measurement:

[0051] In the calibration process, it includes the following steps:

[0052] A. Use two electrodes instead of the eddy current sensor to connect to the eddy current detector. Connect the two electrodes to the eddy current detector and the metal plate sample 30 with a known paint curing degree (at this time image 3 The metal plate is a metal plate sample) in contact with each other, and its first electrode 41 wraps the soft body 51 impregnated with conductive liquid and then contacts the paint layer 32 on the side of the metal plate sample 30, and its second electrode 42 wraps The soft body 52 impregnated with conductive liquid contacts the paint layer 32 of the metal plate sample on the same side; ...

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PUM

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Abstract

The invention discloses a method for detecting curing degree of lacquer coat of a metal plate, which is characterized in that two electrodes are used for replacing an eddy sensor and connected with an eddy-current inspection instrument; two electrodes are contacted with the metal plate, wherein a first electrode is contacted with the metal plate body at one side of the metal plate or wraps a soft body dipped with conductive solution and subsequently is contacted with the lacquer coat at one side of the metal plate; a second electrode wraps the soft body dipped with conductive solution and subsequently is contacted with the lacquer coat of the metal plate at the same side or the other side; the eddy-current inspection instrument applies the excitation signal of any waveform arranged in advance to the two electrodes; and the curing degree of the lacquer coat of the metal plate is obtained by testing the impedance change between the two electrodes in a way of firstly calibrating and subsequently measuring practically. The method sufficiently utilizes the multi-frequency and frequency spectrum analysis, wavelet analysis and various scanning treatment modes of the eddy-current inspection instrument to obtain a large amount of information that can not be obtained by general electro-chemical instrument, thus testing the curing degree of the lacquer coat of the metal plate conveniently, quickly and effectively, and has the advantages of convenient detection, easy realization, quick detection speed and exact detection effect.

Description

Technical field [0001] The invention relates to a nondestructive testing method, in particular to a testing method for the degree of curing of a metal plate paint layer. Background technique [0002] The metal plate paint layer is a layer of organic material coated on the metal plate, and the metal plate coated with the paint layer is usually called "color-coated plate" or "color plate". Color-coated plate is a composite plate composed of metal plate and organic material. It has the advantages of both metal plate and organic material. It has excellent cold bending formability, good corrosion resistance, durability and gorgeousness. Therefore, it has many advantages such as high mechanical strength, easy molding, good decoration, corrosion resistance, light weight, long life, and low cost. Color-coated panels have been widely used in large-scale stadiums, civil buildings, automobiles and home appliances, and are favored by construction, transportation, home appliances and other in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90G01N27/9013
Inventor 林俊明
Owner 林俊明