COATED ELECTRICAL STEEL SHEET HAVING EXCELLENT INSULATION PROPERTIES AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2019/132496

A1

The present invention relates to a surface treatment method for an electrical steel sheet comprising the steps of: preparing an electrical steel sheet having a plating layer comprising aluminum on at least one surface; forming a magnesium coating layer by means of vacuum evaporating magnesium on the plating layer; and heat treating the electrical steel sheet having the aluminum plating layer and the magnesium coating layer at 750-950°C. According to the present invention, a uniform magnesium oxide (MgO) layer is formed on an aluminum-silicon-plated electrical steel sheet and thus a plated electrical steel sheet having insulation is provided. Therefore, a highly efficient electrical steel sheet is applied to an electrical device and can contribute to energy saving, device size reduction and the like.

JUNG YONG-HWA (KR)
KO KYOUNG-PIL (KR)
KIM TAE-YEOB (KR)
LEE DONG-YOEUL (KR)

PCT/KR2018/016632

July 04, 2019

December 26, 2018

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POSCO (KR)

C23C28/00; C23C14/16; C23C14/24; C23C14/58

KR20130074647A	2013-07-04
JP2017502174A	2017-01-19
KR20170076234A	2017-07-04
KR20130076643A	2013-07-08

KANG, JAE UK ET AL.: "Influence of Heat Treatment and Magnesium Content on Corrosion Resistance of A]-Mg Coated Steel Sheet", JOURNAL OF KOREAN INSTITUTE OF SURFACE ENGINEERING, vol. 49, no. 2, April 2016 (2016-04-01), pages 202 - 210, XP055624112

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