해양환경용 알루미늄 합금 재료의 전기화학적 부식 손상 특성

In this study, various electrochemical experiments were carried out to compare the corrosion characteristics of AA5052-O, AA5083-H321 and AA6061-T6 in seawater. The electrochemical impedance and potentiostatic polarization measurements showed that the corrosion resistance is decreased in the order o...

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Veröffentlicht in:Biuletyn Uniejowski 2018, 51(6), , pp.421-429
Hauptverfasser: 김성진(Sung Jin Kim), 황은혜(Eun Hye Hwang), 박일초(Il-Cho Park), 김성종(Seong-Jong Kim)
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Sprache:kor
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Zusammenfassung:In this study, various electrochemical experiments were carried out to compare the corrosion characteristics of AA5052-O, AA5083-H321 and AA6061-T6 in seawater. The electrochemical impedance and potentiostatic polarization measurements showed that the corrosion resistance is decreased in the order of AA5052-O, AA5083-H321 and AA6061-T6, with AA5052-O being the highest resistant. This is closely associated with the property of passive film formed on three tested Al alloys. Based on the slope of Mott-Schottky plots of an n-type semiconductor, the density of oxygen vacancies in the passive film formed on the alloys was determined. This revealed that the defect density is increased in the order of AA5052-O, AA5083-H321 and AA6061-T6. Considering these facts, it is implied that the addition of Mg, Si, and Cu to the Al alloys can degrade the passivity, which is characterized by a passive film structure containing more defect sites, contributing to the decrease in corrosion resistance in seawater.
ISSN:1225-8024
2299-8403
2288-8403
DOI:10.5695/JKISE.2018.51.6.421