Penetrant for color liquid penetrant inspection

 

(57) Abstract:

The invention relates to liquid penetrant inspection, and in particular to compositions of colored penetrants used for color control products responsible destination. Penetrant has the following composition (wt.%): the mixture disasteradio red and mediacoder.exe blue dyes 3-6; nonionic surface-active agent (surfactant) 10-40; solvent else. The mass ratio of the mixture of blue and red dyes is 1:(5-6); as surfactants take neonol or sentenal. Achieved the color of penetrant low volatility, low fire hazard, high sensitivity for identifying the minimum defect opening width of 1-2 μm, which increases the reliability and stability control products in terms of repair and maintenance. 1 S. and 3 C.p. f-crystals, 1 table.

The invention relates to liquid penetrant inspection, in particular, compositions of penetrants - indicator fluids for color industrial control products responsible assignment with class surface treatment Rz 20 and above, for control of metal products, non-porous ceramics and plastics. The invention can be used in aviation, autoplanet to identify on the surface of products of discontinuities of microdefects of the type of cracks then, laminations, cavities and other defects.

Known widely used in Russia colored indicator fluid - penetrants dye penetrant, including solutions of fat-soluble dyes in a mixture of volatile solvents. Famous red dye for dye penetrant, including:

The solvent R-4 (xylene-15, acetone-15, toluene 70%) 970 ml

MK-8 or transformer oil 30-50 ml

Nigrosine 1-5 g

Dye dark red fat-soluble (G) 7 g

(Ed. mon. The USSR №245942).

For control of welded joints and details after stamping, penetrant is applied on the basis of fat-soluble dye having the following composition (wt.%):

- solvent (turpentine 20%; kerosene 80%);

- dye Sudan - 4 at the rate of 10 g per 1 l of solvent. (“Laboratory work on the quality control of welded joints”. Publishing House “Engineering”. Moscow. 1966. P. 69).

For local control in the aerosol version is used penetrant on the basis of fat-soluble dye having the following composition (wt.%):

Mineral oil 0.5-3

Fluorocarbons 35-40

Dye:

Sudan 4 0,5-1,5

Nigrosine 0,05-0,12

military of penetrants for dye penetrant is content in their volatile composition and legnovalledaosta solvent, which limits their applicability for industrial testing. In addition, a well-known penetrants do not have a high level of sensitivity.

To control the individual parts in power engineering developed the set welding materials for dye penetrant. The kit welding materials included ingredients entering into reaction with the change of color from light green transparent to bright pink-red color, such as penetrant introduced an aqueous solution of Nickel and an aqueous ammonia solution in the following ratio of components (wt.h.):

1-50% Aqueous solution of Nickel 100

Nitrate sodium 1-2

Isopropyl alcohol 2-8

Aqueous ammonia To pH-8

(Ed. mon. The USSR №1679308).

The drawback of this penetrant is instability control and corrosive, which does not allow to use it for control in an aircraft.

For dye penetrant foreign firms use penetrant that does not contain mineral oil and azo dyes. As the solvent used high temperature alcohols and emulsifiers. (German Patent No. 4421277).

Organic dye 0,5-0,7

Solvents:

Castor oil 40-50

Ethanol Else

As the organic dye used rodann C.

(Ed. mon. The USSR №1193546).

Penetrant is designed to detect facing surface cracks during testing of products from non-metallic crystalline materials, such as models based on urea, used for casting in shell form.

The disadvantage of the penetrant, taken as a prototype, is the reduced penetration ability, lack of color defects in the visible color. In addition, this penetrant fire, belongs to the class of flammable liquids.

The technical purpose of this invention is to provide a color penetrant high penetrating ability, reduced fire hazard, identifying the minimum defect opening width of 1-2 μm when the surface treatment of parts with class Rz 20 and above.

To achieve the technical objectives proposed penetrant for color liquid penetrant inspection, having the following composition (wt. %)

Organic dye surface-active substance (surfactant) 10-40

The solvent Else

As the nonionic surfactants used neonol or sentenal.

The solvent is a mixture of dibutylsebacate with butyl alcohol at a mass ratio of 2:1.

The mixture mediacoder.exe blue to disasteradio red dye charge / mass ratio of 1: (6-5).

This object is achieved in that during the development of the color of penetrant in the coloring framework was used a mixture of fat-soluble dyes - mediacoder.exe blue and disasteradio red in a mixture of high temperature non-volatile solvents, creating in the presence of nonionic surfactants stable solution.

Due coloristically properties (color, brightness) of the dyes diazatricyclo gives red color to the penetrant ( max 500-513 nm in the visible region of the spectrum) however, due to the poor solubility of the dye in these solvents cannot create a sufficient concentration of dye in these solvents, and therefore, the brightness of color of the track defect (control) weak. To strengthen the color of penetrant in the dye solution was introduced fat-soluble mediatoday blue dye having a maximum wavelength significantly increase the brightness of color of penetrant in the presence of surfactants.

To create a color of penetrant necessary to adjust the composition of the dye, solvent, and surfactant, as for most dyes coloristically properties significantly change depending on the solvent, and the influence of the latter it is impossible to predict. Nevoennoe surfactant is added to the used solvent to improve the solubility of the dye. It should be borne in mind that the presence of surfactants can have undesirable effects on the spectral characteristics of the dye. Offered as surfactants sentenal or neonol improves the solubility of the penetrant and does not affect the color properties of the dye. Dye, preserving the spectral characteristics was selected red and blue. The same method was used to fit a mixture of dibutylsebacate with butyl alcohol.

From the point of view of liquid penetrant inspection colored penetrant-inspection of material, which is a brightly colored liquid (dye solution), who are able to moisten the material and to penetrate into the defects in the action of capillary forces. For this purpose penetrant must be sufficiently high surface tension and wetting angle with the flow, close the ebouaney:

- possess a high boiling point,

- low volatility,

- well to dissolve the dyes to impart color contrast.

Given the above requirement, as a liquid component for the color of penetrant was used to fit a mixture of dibutylsebacate and butyl alcohol in the weight ratio of (2:1)

Butyl alcohol - GOST 6006-88 has a boiling point of 114-S, the surface tension at 20 ° C is 24,6 DM/cm wetting angle - 2, flash 35S.

Dibutylsebacate - plasticizer, limits boiling point 290-300C; ignition temperature 200C, the surface tension of 42.6 DM/cm, the contact angle of 21±3. Selected mixture of the solvent and the introduction of surfactant was increased smachiwausa the ability of the penetrant.

We have investigated nonionic surfactants of a range of ethoxylated alcohols fraction 12-14, related to biologically mild surfactants. In the result as the optimal connection was selected neonol and sentenal.

If Vvedenie nonionic surfactant mixture dibutylsebacate with butyl alcohol has a surface tension of 30 DM/cm; wetting angle of 10±3; flash point not less than 120C.

Penetrant, I

In laboratory conditions it was taken 4 metal sample with artificial defects corresponding to the second class of sensitivity according to GOST 18442-80, where the 1st sample with defects opening width of 2.5 μm, a depth of 50 μm; 2nd sample with defects opening width of 1.5 μm, a depth of 30 μm; 3rd sample with defects and opening width of 1.0 μm, a depth of 20 μm; 4-th sample with defects opening width of 7-10 μm, a depth of 300 μm, fragments of parts with surface finish Rz 20 with natural defects, as well as samples of ceramics (percent porosity < 30%) with artificial defects, which caused the proposed penetrant, withstood, the excess of penetrant deleted cotton cloth and applied the developer PR-15 (the liquid THAT-1-595-22-675-2001) were dried for 3 min at C. Controlled surface viewed in visible light in the presence of location of defects in the red-blue trail of a defect on a white background surface.

Formulations of penetrant and penetrant prototype and the testing results are shown in table.

The testing results show that the developed color for liquid penetrant flaw detection has low volatility and low p is ü control 99% with the identification of the minimum defect opening width of 1-2 μm, reliability and stability control products in terms of repair and maintenance.

1. Penetrant for color liquid penetrant inspection, including organic dye and a solvent, characterized in that it additionally contains a nonionic surfactant as an organic dye used fat-soluble dye is a mixture of disasteradio red and mediacoder.exe blue dye and the solvent is a mixture of dibutylsebacate with butyl alcohol in the following ratio, wt.%:

The mixture of dyes 3-6

Nonionic surfactants

substance (surfactant) 10-40

The solvent Else

2. Penetrant for color liquid penetrant inspection under item 1, characterized in that as the nonionic surfactants used neonol, sentenal.

3. Penetrant for color liquid penetrant inspection under item 1, characterized in that the mixture mediacoder.exe blue and disasteradio red dyes charge / mass ratio of 1:(6-5).

4. Penetrant for color liquid penetrant inspection under item 1, characterized in that the mixture of dibutylsebacate with butyl alcohol take in mass

 

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