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코어금형용강 SKD11의 플라즈마 전해산화에 의한 피막 형성
김상무 ( S. M. Kim ),이태행 ( T. H. Lee ),강석조 ( S. J. Kang ),조영희 ( Y. H. Cho ),구자명 ( J. M. Koo ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.4
Surface coatings were prepared on SKD11 core mold steel by plasma electrolytic oxidation (PEO). The coatings were investigated about the formation condition of core mold steel. SKD11 were coated by PEO in a mix solution of Sodium Aluminate NaAlO2 (10g/l), Sodium Silicate powder Na2SiO3 (0.5g/l), Sodium tungstate dihydrate Na2WO42H2O (0.5g/l) at less than 30℃. The electrical condition were voltage : 500~600V ; Pulse : 600~1800Hz ; current density 15~20A/dm2 ; various time : 3min~40min. The coatings surface morphology, cross-section, friction coefficient, hardness were investigated. The coatings on SKD11 core mold steel by PEO indicated that the extension of service life.