Journal
CORROSION SCIENCE
Volume 143, Issue -, Pages 46-55Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.08.030
Keywords
Aluminium; Polarization; SEM; Intergranular corrosion; Pitting corrosion
Funding
- Slovenian Research Agency Programme [P2-0270]
- JSPS KAKENHI [JP16H04247, JP16K14417]
- Amada Foundation [AF-2016217]
- ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
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This work reports for the first time the effect of femtosecond laser shock peening (fLSP) without a sacrificial overlay under atmospheric conditions (no confinement) on the corrosion behaviour of AA2024-T3. After fLSP and additional exposure to air a superhydrophobic state (theta = 160 +/- 4 degrees) is achieved. Moreover, fLSPed corrosion-resistant surface contributes to increased polarization resistance, reduced corrosion current and lower anodic dissolution, with long-term stability in aggressive chloride solution. Furthermore, SEM/EDS characterisation reveals reduction in pitting and complete eradication of intergranular corrosion (IGC) attack due to reduced metal/electrolyte contact area and homogeneous, refined microstructure which prevents chain-link IGC propagation.
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