Defectoscopic material set for capillary inspection

FIELD: nondestructive inspection.

SUBSTANCE: color chemical reaction between penetrant and developer is used for defect indication. Penetrant has surface-active substance (SAS), ethyl alcohol, water, boric acid. Developer has glycerin, kaolin, SAS, ethyl alcohol, bromine-thymol blue indicator and PH regulator for achieving initial blue-green color.

EFFECT: improved reliability.

 

The invention relates to non-destructive testing products using colored liquid penetrant inspection can be used to detect mainly the surface defects of products and materials. Pets using the proposed set of welding materials for detection of through defects, for example, when the hydraulic testing.

A special feature of this kit is used for indicating defects colored chemical reaction between the penetrant and the developer.

Closest to the invention is a set of indicator materials for liquid penetrant inspection, including the following components (wt.%): Cm. A.S. 1824557, CL, G 01 N 21/91, 3/20 - prototype.

Penetrant:

The peroxide0,5-1,0
Acetone5,0-6,0
Sentenal0,3-0,5
Waterrest

Cleaner:

Water100

Developer:

10,0-12,0
Potassium iodide1,0-1,6
Soluble starch3,0-4,0
Glycerin20,0-30,0
Corn starch
Titanium dioxide10,0-12,0
Waterrest

A significant drawback of this kit material materials is reduced sensitivity, since the hydrogen peroxide, which is one of the components of the indicator reaction, easily washed out from the defects of the water during the operation of removal of excess penetrant, in addition, the peroxide decomposes over time, losing their chemical activity. Another disadvantage is the increased toxicity of some components of the kit: acetone and potassium iodide.

The objective of the invention is to increase the sensitivity of capillary control and environmental safety.

The problem is solved in that a complete inspection of materials, including penetrant containing one of the reactive components of the color of the indicator reaction, a surfactant, an organic solvent and water, purifier, containing water, and a developer containing the second reactive component color of the indicator reaction and the target additive penetrant as a reactive component of the indicator reaction contains acid that has limited solubility in water, for example boric acid, H3IN3the Rast is almost in water which is 4.9% at 20° With, and as the organic solvent is ethyl alcohol, a developer in as the second reactive component of the indicator reaction contains a indicator with a color transition at a pH of 6.0 and 7.6 for example bronchiology blue, and the components of the kit taken in the following ratio, wt.%:

Penetrant

Boric acid1,8-2,2
PAV0,4-0,6
Ethyl alcohol8,0-10
Waterrest

Purifier

Water100

Developer

Bronchiology blue0,15-0,20
Glycerin9,0-11,0
Kaolin22,0-25,0
PAVof 0.4-0.6
Ethyl alcohol15,0-17,0
The pH regulatorto achieve the blue-green color
Waterrest

For the experimental verification of flaw detection kit of materials according to the invention was prepared with 5 trains of pregrant and developer.

The preparation of the compounds was carried out by mutual dissolution and re is eshiwani hanging components in accordance with the recipe.

Experimental verification of the sensitivity was performed in two ways:

First method: application developer layer thickness of 0.1 to 0.2 mm on an aluminum plate measuring 100×100 mm and then coating the developer drops of penetrant, diluted 30 times. The brightness of the yellow spots and the time of its launch, the blue-green background characterize the sensitivity of penetrant.

Method two: control of surface cracks on the test samples based on the following technologies:

- degreasing the surface of the sample with acetone, drying in thermacare at t=150°C for 15 min;

- application of penetrant extract, 10 min, repeated application and immediately remove its excess irrigation weak stream of demineralized water;

- dehydration of the sample surface with a cloth or by blowing a stream of air;

- application developer thin layer (0.1-0.2 mm), examination, excerpt 30 min and re-inspection in order to detect a trace of yellow on the blue-green background of the developer;

- remove developer washing water;

- dehydration of samples.

Samples - steel plates with cracks that meets the requirements of GOST 18442-80, one (No. 1) opening width of cracks 2.5 μm, and another (No. 2) opening width of 0.9 μm.

The table shows the technical characteristics of the sets of welding materials according to the invention.

5%R-R
Table
Component nameContent, wt.%
DescriptionNo. 1No. 2No. 3No. 4No. 5
Penetrant
Boric acid1,61,82,02,22,4
Saw sentenal0,30,40,50,60,7
Ethyl alcohol7891011
Waterrest
Developer
Bronchiology blue0,10,150,20,250,3
Glycerin89101112
Kaolin202223,52527
Saw sentenal0,30,40,50,60,7
Ethyl alcohol1415161718
11111
Waterrest
Check sensitivity
Drop on the plate:
the brightness of the spotpalebrightbrightbrightpale
The time of development2 min3010102 min
The visual effect
The readout on the control sample
No. 1reduced brightnessbrightbrightbrightno
No. 2noreduced brightnessbrightreduced brightnessno

Set of welding materials for capillary control, including penetrant containing the reactive component of the color indicator is eacli, surfactant, an organic solvent and water, cleaner water, and a developer containing the second component color of the indicator reaction and the target additive, wherein the penetrant as a reactive component of the indicator reaction contains boric acid, and organic solvent is ethyl alcohol, a developer in as the second reactive component of the indicator reaction contains the indicator bronchiology blue with the color transition pH of 6.0 and 7.6, and the components of the kit taken in the following ratio, wt.%:

Penetrant

Boric acid1,8-2,2
PAV0,4-0,6
Ethyl alcohol8,0-10,0
WaterRest

Purifier

Water100

Developer

Bronchiology blueof 0.15-0.2
Glycerin9,0-11,0
Kaolin22,0-25,0
PAV0,4-06
Ethyl alcohol15,0-17,0
The pH regulatorTo the achievement
blue-green color
WaterRest



 

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