Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


한국표면공학회지 (26권3호 109-114)

Black oxide coating on Invar steel

인바강재의 흑화처리

Kim, H. G.;Kang, T.;

서울대학교 금속공학과;
Dept. of Metall. Eng., Seoul National Univ.;


Black magnetite film could be formed on Invar steel for shadows mask by iron electroplating in thickness of 0.46~0.63$mu extrm{m}$ on Invar steel and subsequent oxidation of iron by immersion in strongly alkaline soution for 30~60 minutes. blackness degreed of magnetite oxide film on Invar was C20BL90 in comparision of color chart of Dainippon Ink & Chemicals Inc. Co. and adhesion test showed excellent adhesion of oxide film on substrate. Magnetite oxide film grew up on iron in hot strongly alkaline solution according to `Sato-Cohen` oxide film growth model.