Fluorescent penetrant system

Details Fluorescent penetrant system Fluorescent penetrant system

1980-03-12

1981-07-28

Hoffman, James R.

Coating processes

Fluorescent or phosphorescent coating

427 8, 427 9, B05D 724, C09K 1100

Patent

active

042810337

ABSTRACT:
A method for non-destructive testing for flaws on the surface of a workpiece which includes the step of applying a penetrant composition including a fluorescent dye in a liquid vehicle onto the surface to permit the penetrant to become trapped in the flaws and then removing excess penetrant from the surface while leaving penetrant entrapped in such flaws. A remover is then applied to the surface, the remover composition including a solvent, at least one surface active agent which serves as an emulsifier for the liquid vehicle of entrapped penetrant, and a fluorescent material which is more readily soluble in the liquid vehicle of the penetrant than it is in the solvent. Upon contact of the entrapped penetrant with the remover, the fluorescent material from the remover is preferentially absorbed in the penetrant vehicle entrapped in the flaws thereby enhancing the fluorescent indication provided by the entrapped penetrant. The indications are developed in the usual way by applying a developer to the surface to draw the entrapped penetrant to the surface of the workpiece where it is contrastingly visible to the surface and is observable by viewing the surface under ultraviolet light.

REFERENCES:
patent: 3558882 (1971-01-01), Mlot-Fijalkowski
patent: 3845658 (1974-11-01), Conway et al.
patent: 3930063 (1975-12-01), Miller et al.
patent: 4116634 (1978-09-01), Nieberlein

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