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논문 기본 정보

자료유형
학술저널
저자정보
김명환 (부경대학교) 이만식 (한국생산기술연구원) 곽삼탁 (부경대학교) 문명준 (부경대학교)
저널정보
한국표면공학회 한국표면공학회지 한국표면공학회지 제44권 제3호
발행연도
2011.6
수록면
82 - 88 (7page)

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초록· 키워드

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A uniform chromium-free conversion coating treated with an alkaline phosphate- permanganate solution was formed on the AZ 31 magnesium alloy. The effect of acid pickling on the morphology and on the corrosion resistance of the alkaline phosphate-permanganate conversion coating was investigated. The chemical composition and phase structure of conversion coating layer were determined via optical microscopy, SEM, EDS, XPS and XRD. Results show that the conversion coatings are relatively uniform and continuous, with thickness 1.8 to 2.4 ㎛. The alkaline phosphate-permanganate conversion coating was mainly composed of elements Mg, O, P, Al and Mn. The conversion-coated layers were stable compounds of magnesium oxide and spinel (MgAl₂O₄). These compounds were excellent inhibitors to corrosion. The electrochemical corrosion behaviors of coatings in 3.5 wt.% NaCl solutions were evaluated by electrochemical impedance spectroscopy, potentiodynamic polarization technique. EIS results showed a polarization resistance of 0.1 kΩ for the untreated Mg and 16 kΩ for the alkaline phosphate-permanganate conversion treatment sample, giving an improvement of about 160 times. The results of the electrochemical measurements demonstrated that the corrosion resistance of the AZ 31 magnesium alloy was improved by the alkaline phosphate-permanganate conversion treatment.

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Abstract
1. 서론
2. 실험 방법
3. 실험 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2013-581-000554811