Pretreatment liquid and method for producing electromagnetic steel sheet with insulating film

An electromagnetic steel sheet with an insulating film, which has an excellent appearance, high tension, low iron loss, and excellent insulating properties, is obtained. To this end, provided is a pretreatment liquid to be used before applying an insulating coating treatment liquid containing a phos...

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Bibliographische Detailangaben
Hauptverfasser:	TERASHIMA TAKASHI, KOKUFU KARIN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALLOYS BASIC ELECTRIC ELEMENTS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRICITY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INDUCTANCES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAGNETS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSFORMERS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	An electromagnetic steel sheet with an insulating film, which has an excellent appearance, high tension, low iron loss, and excellent insulating properties, is obtained. To this end, provided is a pretreatment liquid to be used before applying an insulating coating treatment liquid containing a phosphate to an electromagnetic steel sheet having a forsterite coating on the surface. When the phosphoric acid concentration of the pretreatment liquid is A mass% in terms of H3PO4, the refractive index R of the pretreatment liquid satisfies formula (1): 9.0 * 10-4 * A + 1.3340 < = R. 得到外观优良、赋予张力高、铁损低且绝缘性优良的带有绝缘覆膜的电磁钢板。为此，提供在将含有磷酸盐的绝缘覆膜处理液涂布于在表面具有镁橄榄石覆膜的电磁钢板之前使用的预处理液。将上述预处理液的磷酸浓度以H3PO4换算计设为A质量%时，上述预处理液的折射率R满足式(1)：9.0×10-4×A+1.3340≤R。