Radiant energy – Radiation tracer methods
Patent
1976-02-23
1977-01-11
Queisser, Richard C.
Radiant energy
Radiation tracer methods
73104, 25230119, G01N 1908, G01N 2116, C09K 1106
Patent
active
040029050
ABSTRACT:
A water washable substantially biodegradable dye penetrant composition having excellent sensitivity and high stability, for use in non-destructive testing of objects to locate voids and defects therein, said composition consisting essentially of an organic dye, preferably a fluorescent dye, and a carrier or solvent for said dye, in the form of a mixture of certain ethoxylated linear alcohols, particularly a combination of biodegradable nonionic surfactants each comprised of ethoxylates of a mixture of secondary alcohols having linear alkyl chains of from 11 to 15 carbon atoms, one of which contains an average of 5 moles of ethylene oxide, and another of which contains an average of 9 moles of ethylene oxide. In the method of application of the dye penetrant compositions, such composition is applied to the surface of an object containing cracks and flaws, water is applied to the surface of the object to remove excess liquid dye penetrant composition from the surface without removing such penetrant from the cracks and defects, and with or without a developer, the surface of the object is viewed under suitable lighting conditions, e.g. ultraviolet or black light when the dye in the penetrant is a fluorescent dye, to locate any cracks or defects in the surface of the body as indicated by colored traces from the dye penetrant remaining in the cracks and flaws.
REFERENCES:
patent: RE26888 (1970-05-01), Alburger
patent: 2953530 (1960-09-01), Switzer
patent: 3716492 (1973-02-01), Graham et al.
Beauchamp John P.
Humphries L. Lee
Queisser Richard C.
Rockwell International Corporation
Silberberg C. T.
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