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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2024.6
- 수록면
- 1,556 - 1,570 (15page)
- DOI
- 10.1007/s12540-023-01587-4
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초록· 키워드
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The pitting corrosion tendency of the as-extruded AA6063 alloy was investigated in this study through immersion corrosionand electrochemical corrosion tests at various aging temperatures. The morphologies of the corroded samples were characterizedusing OM, WLI, SEM, and TEM. The corrosion resistance of as-extruded alloys with various heat treatments wasassessed using an electrochemical workstation and SECM. The surface potential at various positions on the alloy surfacewas measured using KPFM. The results indicate that as the aging temperature increases, the corrosion mode of the alloyshifts primarily from subcritical pitting corrosion to pitting corrosion. This shift eventually leads to the formation of stablepitting corrosion, and the alloy’s pitting corrosion resistance gradually decreases. Surface potentials vary among differenttypes of second-phase particles, with Mg2Simeasuring 1.57 V and β-AlFeSi measuring 2.14 V. The existence of a potentialdifference between the matrix and the second-phase particles leads to the formation of both crystalline and cathodic pits.
As the temperature increases, the number of active sites for pitting corrosion also increases. Longitudinal expansion of thepits takes place along densely packed (100) planes, forming a semi-cubic stepped crystal structure. Lateral expansion of pitsoccurs parallel to the <001>Al direction, demonstrating filamentous corrosion expansion.
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