Method of magnetic particle testing using strippable coatings

Compositions – Magnetic – Flaw detection or magnetic clutch

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G01R 3312, H01F 128

Patent

active

039518817

ABSTRACT:
Method for nondestructive magnetic inspection of an object for detecting defects and discontinuities in a surface thereof, by applying a coating, preferably an organic coating, containing a coloring or opaque material, to the object, for contrast therewith, establishing magnetic flux lines at an angle and preferably substantially perpendicular, to the suspected defects and discontinuities in a surface of the object, applying non-fluorescent magnetic particles, preferably suspended in a liquid medium, over the coating on the surface of the object and causing the particles to agglomerate and form indications on the coating adjacent to the surface defects and discontinuities in the object, and inspecting the body under natural or white light to reveal such defects and discontinuities indications as defined by the agglomerated magnetic particles. Where a record of the indications of defects and discontinuities is desired, a strippable colored, e.g. white, coating is initially applied, and following magnetization to locate and reveal the surface defects and discontinuities, a clear strippable coating is applied over the colored coating containing the magnetic indications of defects, and the resulting coating containing the indications formed by the agglomerated magnetic particles can be stripped from the surface of the object, and such coating employed as a record of such indications.

REFERENCES:
patent: 2751352 (1956-06-01), Bondi
patent: 3843540 (1974-10-01), Reimers et al.

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