Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Electrochemical Corrosion Damage Characteristics of Aluminum Alloy Materials for Marine Environment

해양환경용 알루미늄 합금 재료의 전기화학적 부식 손상 특성

  • Kim, Sung Jin (Department of Materials Science and Engineering, Sunchon National University) ;
  • Hwang, Eun Hye (Department of Materials Science and Engineering, Sunchon National University) ;
  • Park, Il-Cho (Division of Marine Engineering, Mokpo National Maritime University) ;
  • Kim, Seong-Jong (Division of Marine Engineering, Mokpo National Maritime University)
  • 김성진 (순천대학교 신소재공학과) ;
  • 황은혜 (순천대학교 신소재공학과) ;
  • 박일초 (목포해양대학교 기관시스템공학부) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2018.10.17
  • Accepted : 2018.12.21
  • Published : 2018.12.31
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Abstract

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.

Keywords

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Fig. 1. Microstructures of Al alloys; (a) AA5052-O, (b) AA5083-H321, (c) AA6061-T6.

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Fig. 2. EIS Nyquist plots of (a) AA5052-O with immersion time in seawater, and (b) three tested Al alloys after 7 hrs immersion in seawater.

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Fig. 3. Mott-Schottky plots of passive films formed on three tested Al alloys in 0.5M H2SO4 solution.

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Fig. 5. Surface morphologies of three Al alloys after the polarization test in seawater.

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Fig. 6. 3D analysis of three Al alloys after the polarization test in seawater.

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Fig. 4. (a) Potentiostatic polarization curves of three tested Al alloys in seawater, and (b) surface view observation after the polarization test.

Table 1. Chemical compositions of aluminum alloys (wt%)

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Table 2. Chemical compositions and properties of natural seawater

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Table 3. Donor density of passive film formed on three tested aluminum alloys

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