Role of gradient nanograined surface layer on corrosion behavior of aluminum 7075 alloy

V. K. Beura, Y. Karanth, K. Darling, K. Solanki

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Gradient nano-grained structures have been a promising technique to evade the strength-ductility trade-off in metals and alloys. Therefore, in this work, the effect of surface mechanical attrition treatment (SMAT) on the microstructure and corrosion behavior of the high-strength aluminum alloy was investigated. SMAT was performed at room temperature and liquid-nitrogen (LN2) flow conditions to generate two distinctly different initial gradient microstructures. Potentiodynamic polarization, electrochemical impedance spectroscopy, and intergranular corrosion tests were performed. Surface film characterization of untreated and treated samples was performed using X-ray photoelectron spectroscopy and time of flight secondary ion mass spectroscopy techniques. Result reveals significant microstructural changes in SMAT processed samples such as the formation of precipitates and dissolution of inherent phases. In addition, a reduced anodic dissolution rate was observed with the SMAT processed samples. Furthermore, the surface film characterization revealed a thicker oxide film with Cu and SiO2 enrichment in SMAT samples.

Original languageEnglish (US)
Article number62
Journalnpj Materials Degradation
Issue number1
StatePublished - Dec 2022

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry (miscellaneous)
  • Materials Science (miscellaneous)
  • Materials Chemistry


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