[논문]PEO 처리시 Ca-GP첨가에 따른 AZ31합금의 내식성 및 표면특성에 관한 연구

이준수; 박제신; 박일송

doi:10.5695/jkise.2021.54.5.238

PEO 처리시 Ca-GP첨가에 따른 AZ31합금의 내식성 및 표면특성에 관한 연구
A study on corrosion resistance and surface properties of AZ31 alloy according to Ca-GP addition during PEO treatment 원문보기

한국표면공학회지 = Journal of the Korean institute of surface engineering, v.54 no.5, 2021년, pp.238 - 247

이준수 (전북대학교 금속공학과) , 박제신 (전북대학교 금속공학과) , 박일송 (전북대학교 금속공학과)

Abstract ▼ AI-Helper

PEO (plasma electrolytic oxidation) was applied to modify the surface of AZ31 magnesium alloy in this study. The mixed solution of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) was used as the electrolyte, and 0 - 0.05 g/L of Ca-GP (Glycerol Phosphate Calcium salt) was added in the electrolyte as an additive. PEO treatment was conducted at a current density of 30mA/cm2 for 5 minutes using a DC power supply. The surface properties were identified by SEM, XRD and surface roughness analyses, and the corrosion resistance was evaluated by potentiodynamic polarization and immersion tests. In addition, the biocompatibility was evaluated by immersion test in SBF solution. As the concentration of Ca-GP was increased, the surface morphology was denser and more uniform, and the amount of Ca and the thickness of oxide layer increased. Only Mg peak was observed in XRD analysis due to very thin oxide layer. The corrosion resistance of PEO-treated samples increased with the concentration of Ca-GP in comparision with the untreated sample. In particular, the highest corrosion resistance was identified at the group of 0.04g Ca-GP through potentiodynamic polarization and immersion tests in saline solution (0.9 wt.%NaCl). During the immersion in saline solution, pH rapidly increased at the beginning of immersion period due to rapid corrosion, and then increase rate of pH decreased. However, the pH value in the SBF temporarily increased from 7.4 to 8.5 during the day, then decreased due to the inhibition of corrosion with HA(hydroxyapatite) formation.

주제어

표/그림 (11)

표 Table 1. The PEO condition used in this study.
그림 Fig. 1. SEM images of anodic oxide film of AZ31 magnesium alloy anodized at 30mA/cm² for 5min in the electrolytic solutions containing different Ca-GP concentrations. (A) 0g/L (B) 0.01g/L (C) 0.02g/L (D) 0.03g/L (E) 0.04g/L (F) 0.05g/L.
표 Table. 2. EDS results on the PEO-coated area. (wt.%)
그림 Fig. 2. XRD spectra of AZ31 Mg alloy anodized in the electrolyte consisting of 8g/L NaOH + 12g/L Na₂SiO₃ + Xg/L Ca-GP electrolytes. X= 0, 0.01, 0.02, 0.03, 0.04, 0.05. (including untreated sample.)
그림 Fig. 3. The results of surface roughness for each sample.
표 Table. 3. The measured thickness of anodized layer of PEO-coated AZ31 sample.
그림 Fig. 4. Potentiodynamic polarization curves of untreated and PEO-coated AZ31 samples in 0.9 wt.% NaCl solution.
표 Table. 4. The corrosion potential and the corrosion current of all samples.
그림 Fig. 5. The pH changes of untreated and PEO-coated AZ31 samples with immersion time in the saline solution.
그림 Fig. 6. The reduction rate of weight of untreated and PEO-coated AZ31 samples after immersion in saline solution for 7 days.
그림 Fig. 7. The pH changes of untreated and PEO-coated AZ31 samples with immersion time in the SBF solution.

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