콘텐츠 본문
논문 해외 국제전문학술지(SCI급) Selective removal of Fe-rich intermetallics in AA8079 by mixed HNO3/HF pretreatment: Implications for aluminum–polypropylene interfacial integrity
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2026-06
- 저자명 Park, J. W., Kang, J. H., Han, B. J., Appiah, E., Kim, J. H., Lee, Y. S., Kim, J.-C., Noh, J., and Kim, J. H.*
- 학술지명 Materials & Design
- 발행처명 ELSEVIER
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 9
- 논문 다운로드 링크(외부) https://www.sciencedirect.com/science/article/pii/S0264127526009846?via%3Dihub
논문 초록 (Abstract)
Fe-containing intermetallic compounds (Fe-IMCs) in 8xxx aluminum alloys act as cathodic sites that promote localized corrosion and generate defects in anodic oxide films. A combined pretreatment—alkaline etching followed by mixed HNO3/HF pickling under ultrasonication (NH-U)—was applied to selectively remove Fe-rich Al13Fe4 from AA8079 before phosphoric acid anodizing. Alkaline etching exposed and partially oxidized Fe-IMCs, whereas single-acid pickling (HNO3 or HF) left residual cathodic inclusions at the surface. Mixed HNO3/HF without ultrasonication partially reduced the surface IMC population, whereas NH-U eliminated detectable surface Fe-IMCs and produced a micro-roughened surface. Anodizing on the IMC-free substrate yielded a uniform porous oxide, while untreated AA8079 formed heterogeneous films locally perturbed by Fe dissolution and incorporation. Cross-sectional elemental mapping confirmed Fe incorporation into the anodic oxide above residual IMCs, creating thinner and compositionally altered regions that can disrupt film uniformity and interfacial integrity. As an application-level indicator of film quality, lap-shear strength of anodized Al–polypropylene joints increased from ∼9 MPa to ∼21 MPa after NH-U pretreatment. Selective Fe-IMC dissolution is therefore identified as a prerequisite for mechanically robust and structurally uniform anodic films on AA8079. The pretreatment offers a scalable route to suppress cathodic-particle-driven film breakdown in battery-foil processing and joining applications.
