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자료유형
학술저널
저자정보
권두영 (한국재료연구소) 송풍근 (부산대학교) 문성모 (한국재료연구소)
저널정보
한국표면공학회 한국표면공학회지 한국표면공학회지 제54권 제4호
발행연도
2021.8
수록면
184 - 193 (10page)

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This study demonstrates formation behavior and morphological changes of PEO (Plasma Electrolytic Oxidation) films on AZ91 Mg alloy as a function of pre-treatment time in 1 M HF solution at 25 ± 1 ℃. The electrochemical behavior and morphological changes of AZ91 Mg alloy in the pre-treatment solution were also investigated with pre-treatment time. The PEO films were formed on the pre-treated AZ91 Mg alloy specimen by the application of anodic current 100 ㎃/㎠ of 300 ㎐ AC in 0.1 M NaOH + 0.4 M Na₂SiO₃ solution. Vigorous generation of hydrogen bubbles were observed upon immersion in the pre-treatment solution and its generation rate decreased with immersion time. It was also found that β-Mg<SUB>17</SUB>Al<SUB>12</SUB> in AZ91 Mg alloy was dissolved and a protective thin film of MgF₂ was formed on the AZ91 Mg alloy surface during the pre-treatment process in the 1 M HF solution. PEO film did not grow on the AZ91 Mg alloy specimen when the surface was not pre-treated and irregular PEO films with nodular defects were formed for the specimens pre-treated up to 1 min. Uniform PEO films were formed when the AZ91 Mg alloy specimen was pre-treated more than 3 min. The growth rate of PEO films on AZ91 Mg alloy increased significantly with increasing pre-treatment time.

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Abstract
1. 서론
2. 실험방법
3. 결과 및 고찰
4. 결론
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