화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.26, No.10, 513-520, October, 2016
DOI10.3740/MRSK.2016.26.10.513  Export Citation
전해 플라즈마 공정에 의해 AZ61A 합금에 형성된 산화물층의 특성에 미치는 OH- 이온 농도의 영향
Influence of OH- Ion Concentration on the Properties of Eelectrolytic Plasma Oxide Coatings Formed on AZ61A Alloy
신성훈, 정영승, Zeeshan Ur Rehman, 구본흔†
  • 창원대학교 신소재공학부
Seong Hun Shin, Young Seung Jeong, Zeeshan Ur Rehman, and Bon Heun Koo†
  • School of Materials Science and Engineering, Changwon National University, Changwon 51140, Republic of Korea
E-mail:
The effect of NaOH concentration on the properties of electrolytic plasma processing (EPP) coating formed on AZ61A Mg alloy is studied. Various types of EPP were employed on magnesium alloy AZ61A in a silicate bath with different concentrations of NaOH additive. Analysis of the composition and structure of the coating layers was carried out using an Xray diffractometer (XRD) and a scanning electron microscope (SEM). The results showed that the oxide coating layer mainly consisted of MgO and Mg2SiO4; its porosity and thickness were highly dependent on the NaOH concentration. The Vickers hardness was over 900 HV for all the coatings. The oxide layer with 3 g/l of NaOH concentration exhibited the highest hardness value (1220 HV) and the lowest wear rate. Potentiodynamic testing of the 3 g/l NaOH concentration showed that this concentration had the highest corrosion resistance value of 2.04 × 105 Ωcm2; however, the corrosion current density value of 5.80 × 10-7 A/cm2 was the lowest such value.
Keywords:electrolytic plasma processing;NaOH;micro-hardness;wear;corrosion
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