Title:
PRE-TREATMENT LIQUID AND METHOD FOR MANUFACTURING ELECTROMAGNETIC STEEL SHEET PROVIDED WITH INSULATING FILM
Document Type and Number:
WIPO Patent Application WO/2023/188594
Kind Code:
A1
Abstract:
The present invention provides an electromagnetic steel sheet that is provided with an insulating film which exhibits a low iron loss and an excellent close-adhesiveness with respect to a forsterite film. For that purpose, provided is a pre-treatment liquid that is to be used on an electromagnetic steel sheet having a forsterite film on the surface thereof, before applying an insulating film treatment liquid containing at least one salt selected from the group consisting of phosphates, borates, and silicates. The pre-treatment liquid contains acetic acid and at least one inorganic acid selected from the group consisting of hydrochloric acid, sulfuric acid, and phosphoric acid. The contained amount of the acetic acid is 1-3000 mass ppm.
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Inventors:
TERASHIMA TAKASHI (JP)
KOKUFU KARIN (JP)
KOKUFU KARIN (JP)
Application Number:
PCT/JP2022/046441
Publication Date:
October 05, 2023
Filing Date:
December 16, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C23C22/00; C21D8/12; C21D9/46; C22C38/00; C22C38/60; C23C22/78; C23G1/08; H01F1/18
Foreign References:
| JPH01259199A | 1989-10-16 | |||
| JP2002322566A | 2002-11-08 | |||
| JPS4819048B1 | 1973-06-11 | |||
| JP2013524022A | 2013-06-17 | |||
| JP2018062682A | 2018-04-19 | |||
| JPS5893823A | 1983-06-03 |
Attorney, Agent or Firm:
ITOH Hideaki et al. (JP)
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