METHOD FOR PRODUCING TREATMENT SOLUTION FOR INSULATING COATING FILM FORMATION USE, METHOD FOR PRODUCING STEEL SHEET HAVING INSULATING COATING FILM ATTACHED THERETO, AND APPARATUS FOR PRODUCING TREATMENT SOLUTION FOR INSULATING COATING FILM FORMATION USE

• Main Authors: KOKUFU Karin, TERASHIMA Takashi, TAKAMIYA Toshito, WATANABE Makoto
• Format: Patent
• Language: English; French; German
• Published: 15.12.2021
• Subjects: 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; INDUCTANCES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAGNETS; METALLURGY; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSFORMERS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

An object is to provide a production method for a treatment solution for forming an insulating coating, in which a technique for enhancing applied tension and resistance to moisture absorption is applicable in a stable manner to the treatment solution that contains phosphate ions and a metal compound and that is for forming a phosphate salt insulating coating, and to provide a production method for an electrical steel sheet having insulating coating using the treatment solution.The production method for a treatment solution is characterized by including: mixing a solution A containing, on a PO43- basis, 0.20 mol/L or more and 10 mol/L or less of phosphoric acid and/or a phosphate salt and containing, on a metal basis, less than 0.50 mol/L of a particulate metal compound and a solution B containing, on a metal basis, 0.50 mol/L or more and 20.0 mol/L or less of the particulate metal compound and containing, on a PO43- basis, less than 0.20 mol/L of phosphoric acid and/or the phosphate salt; and stirring with a turbine stator-type high-speed stirrer such that a peripheral speed of a turbine reaches 10 m/s or more within 60 seconds after starting the mixing of the solution A and the solution B.