Magnetic particle inspection process and composition useable...

C - Chemistry – Metallurgy – 09 – K

Patent

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150/4, 324/52.1

C09K 11/00 (2006.01) G01N 19/08 (2006.01) G01N 27/84 (2006.01) H01F 1/06 (2006.01) H01F 1/113 (2006.01)

Patent

CA 1136028

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 suffi- ciently large so that they fluoresce with sufficient in- tensity to be seen in normal lighting conditions. Con- sequently, 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.

351690

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