PENETRATION AGENT FOR CAPILLARY LUMINESCENT FLAW DETECTION Russian patent published in 2007 - IPC G01N21/91 C09K11/06 

FIELD: capillary luminescent flaw detection, possible use in aviation, automobile, shipbuilding and other branches of mechanical engineering, and also power engineering, chemical and nuclear industries for detection of surface defects, cracks, pores, foliating, abscesses, inter-crystallite corrosion and other defects of material discontinuity flaw type, primarily with small dimensions, in case of especially precise control of products.

SUBSTANCE: penetration agent includes organic phosphor, non-ionic surfactant and solvent, while as organic phosphor a mixture of phosphors from the class of coumarin colorants is used - mixture of donor-coumarin and acceptor-coumarin, as nonionic surfactant a specially defined substance is used, and as solvent a mixture of dibutyl phthalate and propylene carbonate is used with mass ratio ranging from 1:1,5 to 1:0,8. As donor-coumarin, 4-methyl-7-dethyl amine coumarin (K-47) may be used, and as coumarin-acceptor, at least one coumarin of yellow-green luminescence, with mass ratio ranging from 1,1:1 to 1,8:1.

EFFECT: increased sensitivity and reliability of flaw detection, while simultaneously reducing fire hazard and toxicity of used composition.

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