SURFACE-TREATED STEEL SHEET AND PRODUCTION METHOD THEREFOR

Title:

SURFACE-TREATED STEEL SHEET AND PRODUCTION METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2020/222305

Kind Code:

A1

Abstract:

Provided is a surface-treated steel sheet comprising a steel sheet and a nickel-cobalt-iron diffusion layer formed as an outmost layer on the steel sheet, wherein the Co concentration gradient ∆PCo is 33 mass%/0.1 µm or less in the region between depth position DCo_MAX and depth position DCo_15% when the Ni strength, Co strength, and Fe strength of the nickel-cobalt-iron diffusion layer are measured continuously in the depth direction from the surface side by means of radio frequency glow-discharge optical-emission spectrometry and the Ni concentration, Co concentration, and Fe concentration at each depth position of the nickel-cobalt-iron diffusion layer are obtained on the basis of the Ni strength, Co strength, and Fe strength, DCo_MAX being the depth position at which the Co concentration is largest, and DCo_15% being a depth position closer to the steel sheet side than depth position DCo_MAX is and at which the Co concentration is 15% of the largest value.

Inventors:

NAKANO YUJI (JP)
YOSHIOKA KOH (JP)
ISHIHARA KAZUHIKO (JP)

Application Number:

PCT/JP2020/017988

Publication Date:

November 05, 2020

Filing Date:

April 27, 2020

Export Citation:

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Assignee:

TOYO KOHAN CO LTD (JP)

International Classes:

C23C10/28; C25D5/12; C25D5/50; H01M50/107

Foreign References:

JP2016186950A	2016-10-27
JP2007122940A	2007-05-17

Other References:

YOSHIOKA, KOH ET AL.: "2.1.2 Positive electrode can; Development of the Nickel-Cobalt Alloy Plating Material for Alkaline Manganese Battery Cathode Case", March 2017 (2017-03-01), pages 9