Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Formation of Coatings on SKD11 Core Mold Steel by Plasma Electrolytic Oxidation

코어금형용강 SKD11의 플라즈마 전해산화에 의한 피막 형성

  • Kim, S.M. (Div. of Advanced Materials Engineering, Kongju National University) ;
  • Lee, T.H. (Div. of Advanced Materials Engineering, Kongju National University) ;
  • Kang, S.J. (Research Institute of Poscotmc) ;
  • Cho, Y.H. (Div. of Advanced Materials Engineering, Kongju National University) ;
  • Koo, J.M. (Div. of Advanced Materials Engineering, Kongju National University)
  • 김상무 (공주대학교 공과대학 신소재공학부) ;
  • 이태행 (공주대학교 공과대학 신소재공학부) ;
  • 강석조 (포스코 TMC 기술연구소) ;
  • 조영희 (공주대학교 공과대학 신소재공학부) ;
  • 구자명 (공주대학교 공과대학 신소재공학부)
  • Received : 2011.06.02
  • Accepted : 2011.07.08
  • Published : 2011.07.30
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Abstract

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 $NaAlO_2$ (10 g/l), Sodium Silicate powder $Na_2SiO_3$ (0.5 g/l), Sodium tungstate dihydrate $Na_2WO_42H_2O$ (0.5 g/l) at less than $30^{\circ}C$. The electrical condition were voltage : 500~600 V; Pulse : 600~1800 Hz; current density 15~20 $A/dm^2$ various time : 3 min~40 min. The coatings surface morphology, cross-section, friction coefficient, hardness were investigated. The PEO coatings on SKD11 core mold steel showed the extended service life.

Keywords

References

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