전해 연마액 금속 이온 농도에 따른 스테인리스 스틸의 부동태 피막 형성 거동

오종수; 강은영; 정대용; Jong Su Oh; Eun-Young Kang; Dae-Yong Jeong

Korean Journal of Materials Research, Vol.32, No.4, 230-236, April, 2022

DOI10.3740/MRSK.2022.32.4.230 Export Citation

전해 연마액 금속 이온 농도에 따른 스테인리스 스틸의 부동태 피막 형성 거동

Formation Behavior of Passive State Film on Stainless Steel for Metallic Ion Concentration in Electropolishing Solution

오종수, 강은영¹, 정대용^{1, †}

㈜나눌
¹인하대학교 신소재공학과

Jong Su Oh, Eun-Young Kang¹, and Dae-Yong Jeong^{1, †}

NANUL Co. Ltd,, 25, Juyeom-ro 73beon-gil, Michuhol-gu, Incheon 22122, Republic of Korea
¹Department of Materials Science and Engineering, Inha University, 100 Inha-ro, Incheon 22212, Republic of Korea

E-mail:

The formation behavior of a passive state film on the surface of STS304 in electrolytic solution was analyzed to determine its metallic ion composition. The properties of passive state films vary depending on the Fe and Cr ions in the electrolytic solution. It was observed that the passive state film surface became flat and glossy as the concentration of Fe and Cr ions in the electrolytic solution increased. The corrosion resistance property of the passive state film was proportional to the amount of Fe and Cr in the electrolytic solution. An initial passive state film with high Fe concentration was formed on the surface of STS304 during early electrolytic polishing. Osmotic pressure of Fe ions occurs between the passive state film and electrolytic solution due to the Fe ion concentration gradient. The Fe in the passive state film is dissolved into the electrolyte, and Cr fills up the Fe ion vacancies. As a result, a good corrosion-resistant floating film was formed. The more Fe ions in the electrolytic solution, the faster the film is formed, and as a result, a flat passive state film containing a large amount of Cr can be formed.

Keywords:electrolytic polishing;passive state film;electrolytic solution composition

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