FLUORESCENT MAGNETIC POWDER FOR WET MAGNETIC POWDER FLAW DETECTION TEST AND WET MAGNETIC POWDER FLAW DETECTION METHOD USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide fluorescent magnetic powder used for manufacturing fluorescent magnetic powder liquid for a wet magnetic powder flaw detection test in which a fluorescent pigment on the surface of the magnetic powder is difficult to peel off and fall off and remains at a high rate on the surface of the magnetic powder even if fine particles are formed by a pulverization method so that the fluorescent magnetic powder liquid using the fluorescent magnetic powder can form a defect indication pattern with high brightness while there are few fluorescent pigments to peel off or fall off and there are less background phenomenon so that the fluorescent magnetic powder liquid can detect opening defect portions with high accuracy.;SOLUTION: Fluorescent magnetic powder for a wet magnetic particle flaw detection test has the particle surface of magnetically conductive particle powder covered with a fluorescent pigment via a binder resin in which the binder resin is an acrylic emulsion resin with a glass transition point (Tg) of -3 to -9°C.;SELECTED DRAWING: None;COPYRIGHT: (C)2019,JPO&INPIT