Inventors:
Kenneth P. Borrows - Schaumburg IL
Assignee:
Magnaflux Corporation - Chicago IL
International Classification:
G01R 3300
G01N 2784
Abstract:
A method and composition for non-destructive testing of a magnetizable workpiece in which the surface of the workpiece is coated with a composition containing discrete magnetic particles consisting of a ferromagnetic particle core, fluorescent pigment particles attached to said core and a cascading opacifier combined therewith, preferably by means of a film-forming encapsulating resin. The particles of the daylight fluorescent pigment are sufficiently large so that they fluoresce with sufficient intensity to be seen in normal lighting conditions. Consequently, the magnetizable pieces to be inspected can be simultaneously inspected under ultra-violet and white light excitation to reveal both fine cracks and large voids.