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Method for detecting hidden coating pit in composite coating

A composite coating and coating technology, used in measuring devices, instruments, scientific instruments, etc., can solve the problems of inability to detect hidden coating pits, and inability to use electric spark instruments.

Active Publication Date: 2016-06-01
NIPPON PAINT CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, EDM detection cannot detect the existence of hidden coating pits, and EDM detection requires special equipment, and EDM instruments cannot be used in explosion-proof areas, so EDM detection is not suitable for coating production plants

Method used

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  • Method for detecting hidden coating pit in composite coating
  • Method for detecting hidden coating pit in composite coating
  • Method for detecting hidden coating pit in composite coating

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] The preparation method of described composite coating comprises the steps:

[0043] 1) Phosphating treatment: use phosphating solution to phosphate the components;

[0044] The specific conditions of the phosphating treatment are not particularly limited, as long as it does not limit the purpose of the present invention; specifically, the components can be degreased, derusted and surface adjusted, and then phosphating treatment is carried out in the phosphating solution , the component after phosphating treatment is the phosphating component; the phosphating solution is preferably a zinc-based phosphating solution, a zirconium-based phosphating solution or a combination of one or more of other phosphating solutions in the field;

[0045] In a preferred embodiment of the present invention, the specific steps of phosphating treatment are as follows: immerse the cold-rolled steel plate in the degreasing solution for degreasing and cleaning, then put it into the phosphating...

Embodiment 1

[0084] Test panel preparation:

[0085] A. Make electrophoresis plate:

[0086] (1) Making phosphating plate: immerse the cold-rolled steel plate in the SURFCLEANER400A degreasing solution produced by Nippon Paint at 40-50°C for 2-4 minutes, wash off the degreasing solution on the surface of the cold-rolled steel plate with clean water, and then put it into the stand In the SURFDINE CMAKE-UP phosphating solution produced by Bang, phosphating at 40-50°C for 3 minutes to obtain a phosphating plate.

[0087] (2) Making electrophoretic plates: Electrophoretic coating is performed on the phosphating plates produced in the previous step. The electrophoretic paint uses Nippon’s self-produced 301 electrophoretic paint. The temperature of the electrophoretic paint is 27-32°C. Electrophoresis the phosphating plate for 3 minutes under the condition of 200v voltage, and then bake it at 160°C for 20 minutes to obtain an electrophoretic paint film with a thickness between 18-22. between t...

Embodiment 2

[0100] Solvent immersion:

[0101] Soak AR2300 Gothic Black and AR3500731P composite coating samples obtained above in different solvents, and observe the phenomenon after soaking.

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Abstract

The present invention relates to the field of composite coating detection, particularly to a simple and easy-performing method for detecting a hidden coating pit in a composite coating, and further provides uses of a related organic solvent in detection of a hidden coating pit in a composite coating. The present invention provides a method for detecting a hidden coating pit in a composite coating. The method comprises: immersing a member coated with a composite coating in a detection solvent, observing the appearance of the composite coating, and determining whether the hidden coating in the composite coating has pits and / or pinholes. According to the present invention, with the detailed and in-depth research, after the pit in the BASE covered by the varnish is soaked with the suitable solvent, the pit can appear at the same position of the varnish within a short time; wit the method, the covered pit on the hidden coating of the high temperature baking composite coating and the low temperature baking composite coating can be detected, and the method is especially suitable for the coating line products with characteristics of continuous coating, inconvenient detection during the process, or incapability of detection.

Description

technical field [0001] The invention relates to the field of detection of composite coatings, in particular to a simple and easy method for detecting hidden coating pits in composite coatings, and further provides relevant organic solvents for detecting hidden coating pits in composite coatings. use. Background technique [0002] When the paint is painted, due to the paint itself or the paint environment, sometimes the paint will have pits or pinholes. Dimples or pin holes in the varnish are easy to spot. Dimples or pinholes on the BASE are sometimes reflected on the varnish, and are sometimes hidden by the varnish. But these BASEs have pits and needle holes, which are prone to small pits and blisters when they are in a humid environment or polluted by gasoline. There is currently no simple and easy detection method for detecting pits and pinholes covered with coatings. [0003] For pits and pinholes covered with coatings, visual inspection is generally used in the prior...

Claims

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Application Information

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IPC IPC(8): G01N33/00
Inventor 高增奎方黎明吴广士陈敏鸣
Owner NIPPON PAINT CHINA