公开(公告)号：US3502583A

公开(公告)日：1970-03-24

申请号：US3502583D

申请日：1965-09-24

申请人： MAGNAFLUX CORP

发明人： GRAHAM BRUCE C

IPC分类号： C09D5/22 ,  G01N27/84 ,  H01F1/44 ,  H01F1/36 ,  G01N21/16

CPC分类号： H01F1/44 ,  C09D5/22 ,  G01N27/84

公开(公告)号：US3561262A

公开(公告)日：1971-02-09

申请号：US3561262D

申请日：1967-10-26

申请人： MAGNAFLUX CORP

发明人： BORUCKI JAMES S ,  GRAHAM BRUCE C

IPC分类号： G01N21/91 ,  G01N19/08

CPC分类号： G01N21/91 ,  Y10S252/96 ,  Y10S516/01

摘要： A METHOD FOR DETECTING FLAWS AND OTHER SURFACE DISCONTINUTIES BY THE LIQUID PENETRANT TECHNIQUE WHEREIN AN AQUEOUS SOLUTION OF A WATER SOLUBLE CRYSTALLINE SUBSTANCE AND A WATER DISPERSIBLE SURFACTANT SERVES AS THE DEVELOPER FOR ENCHANCING THE VISIBILITY OF FLAW INDICATIONS GENERATED BY THE LIQUID PENETRANT. SAID PENETRANT PREFERABLY CONTAINS A VISIBLE OR FLUORESCENT DYE DISSOLVED THEREIN AND IS OF AN OILY TYPE WHICH ITSELF IS NOT SELFEMULSIFYINGT AND IS SUBSTANTIALLY FREE OF ANY ADDED EMULSIFYING AGENT. THE DEVELOPER, UPON THE EVAPORATION OR DRIVING OFF OF THE WATER, FORMS AN ADHERENT FIL, OR LATTICE LAYER, THAT IS PERMEABLE TO THE LIUQID PENETRANT RESIDUE ENTRAPPED IN ANY SURFACE DISCONTAINUITY SO AS TO CAUSE THE PENETRANT RESIDUE TO BE DRAWN BY CAPILLARITY OR OTHERWISE INTO SAID FILM AND FORM THEREIN FLAW INDICATIONS OF HIGH FIDELITY AND RESOLUTION THAT MAY BE EASILY DETECTED UPON INSPECTION. THE AQUEOUS DEVELOPER OF THIS INVENTION CAN OPTIONALLY INCLUDE FILM FORMING INGREDIENTS THAT EFFECTIVELY CONTROL THE SIZE OF CRYSTALS FORMED UPON DRYING; SEQUESTERING AGENTS FOR USE WITH HARD WATER; AND CORROSION INHIBITING AGENTS; BUT THE RESULTING FILM OR LATTICE LAYER IN ALL CASES IS ENTIRELY WATER SOLUBLE SO THAT THE SURFACE OF THE TEST PIECE CAN BE ADEQUATELY CLEANED BY THE USE OF WATER ALONE AT THE COMPLETION OF THE INSEPCTION STEP.