[논문]대기 노출된 Al6061 알루미늄 합금 산화막에 대한 미세조직 분석

조준영; 권대엽; 최원준; 반치범

doi:10.5695/jsse.2022.55.5.273

대기 노출된 Al6061 알루미늄 합금 산화막에 대한 미세조직 분석
Microstructural Analysis on Oxide Film of Al6061 Exposed to Atmospheric Conditions 원문보기

한국표면공학회지 = Journal of the Korean institute of surface engineering, v.55 no.5, 2022년, pp.273 - 283

조준영 (부산대학교 기계공학부) , 권대엽 (부산대학교 기계공학부) , 최원준 (부산대학교 기계공학부) , 반치범 (부산대학교 기계공학부)

Abstract ▼ AI-Helper

Al6061 aluminum alloy specimens were exposed to atmospheric conditions for maximum 24 months. 24-month exposure specimen showed some more frequent and larger size of corrosion products and pitting on the surface compared with the 12-month exposure specimens. The XRD examination revealed the dominant surface oxide phases of Al2O3 and Al(OH)3. The oxide thickness at uniform oxidation (or non-pitting) region was not much changed over exposure time. The 1.2 ㎛ deep oxygen penetration area was found in the 12-months exposed specimen near the thin uniform aluminum oxide film. The line-EDS was conducted through the penetration regions and non-penetrated grain boundary. There were signs of O and Si concentration through the penetration region, whereas non-penetration region showed no concentration of O or Si. It was confirmed that pitting is a more severe degradation mode in Al6061 (max. >4 ㎛ deep) compared with the uniform oxidation (max. ~200 nm deep) up to 24-months exposure.

주제어

표/그림 (18)

표 Table.1 Chemical composition(wt.%) of aluminum alloy Al6061 specimens
그림 Fig. 1. SEM images of Al6061 surface after (a) 12-months and (b) 24-months exposure to atmospheric conditions (Scale bar is 200 μm long).
그림 Fig. 2. SEM images of corrosion products or oxides on Al6061 after (a) 12-months and (b) 24-months exposure to atmospheric conditions (Scale bar is 10 μm long).
그림 Fig. 3. Magnified SEM image and EDS elemental mapping of corrosion products and pitting on 12-month exposed specimen.
그림 Fig. 4. Magnified SEM image and EDS elemental mapping of pitting on 24-month exposed specimen.
$Fig. 5. X-ray diffraction (XRD) patterns of Al6061 specimens after 12-months and 24-months exposure to atmospheric conditions.$ 그림 Fig. 5. X-ray diffraction (XRD) patterns of Al6061 specimens after 12-months and 24-months exposure to atmospheric conditions.
표 Table.2 Nature of corrosion products formed on four metals[37].
그림 Fig. 6. Locations of uniform corrosion and pitting corrosion TEM specimens where FIB machining was taken (yellow dotted rectangles in left photos) and overall images of TEM specimens (right photos).
그림 Fig. 7. TEM cross-section panorama images and EDS elemental mapping of surface oxide layer formed on Al6061(non-pitting) after 12-month exposure; (a) dark field image and (b) O.
그림 Fig. 8. TEM cross-section panorama images and EDS elemental mapping of surface oxide layer formed on Al6061(non-pitting) after 24-month exposure; (a) dark field image and (b) O.
그림 Fig. 9. TEM cross-section image and EDS elemental mapping of local oxygen penetration region observed in the oxide layer formed on Al6061(non-pitting) after 12-month exposure.
그림 Fig. 10. TEM image and line EDS profile of local oxygen penetration region.
그림 Fig. 11. TEM image and line EDS profile of grain boundary near the local oxygen penetration region.
그림 Fig. 12. TEM cross-section images and EDS elemental mapping of pitting area in Al6061 exposed to atmospheric conditions for (a) 12 months and (b) 24 months.
그림 Fig. 15. TEM cross-section image and EDS elemental mapping of pitting area in 24-month exposure specimen showing severe local corrosion.
그림 Fig. 13. TEM image and line EDS profile of 12 months local oxygen penetration region.
그림 Fig. 14. TEM image and line EDS profile of 24 monthslocal oxygen penetration region.
그림 Fig. 16. Comparison of oxide layer thickness formed on Al1050[29-30], Al2024[31], Al6061(this study), and Al7075[29] exposed to atmospheric conditions.

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