STEEL ETCHING METHOD, METHOD FOR PREPARING SAMPLE FOR OPTICAL MICROSCOPE OBSERVATION, STEEL ETCHING SOLUTION SET, AND ETCHING DEVICE

WIPO Patent Application WO/2024/106124

A1

Provided are a steel etching method that enables a microstructure to be analyzed conveniently and with good precision, a method for preparing a sample for optical microscope observation, a steel etching solution set, and an etching device.　Provided is a steel etching method that includes a first etching step for performing electrolytic etching of steel in a basic solution having a pH greater than 7.0, and a second etching step for performing etching in which the steel is brought into contact with an acidic solution having a pH less than 7.0 after the first etching step. The pH of the basic solution may be 13.0 or higher, and the basic solution may be a KOH aqueous solution. The electric current density during the electrolytic etching can be set to 0.5 A/cm2 or greater. The steel may have martensite and ferrite.

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KAMO YUICHI (JP)

PCT/JP2023/037790

May 23, 2024

October 19, 2023

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JFE STEEL CORP (JP)

G01N1/28; G01N1/32; G01N33/204

CN103398892A	2013-11-20
JPS6279361A	1987-04-11
JP2007204772A	2007-08-16
JP2020101485A	2020-07-02
JPS5915857A	1984-01-26
JP2021018158A	2021-02-15
CN108677092A	2018-10-19
CN113325020A	2021-08-31

KUMASAKA Akira et al. (JP)

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