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Effect of laser shock processing (LSP) on the corrosion resistance of aluminum alloy 2050-T8

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Aluminium alloys are very important category of materials due to their high mechanical properties and wide range of industrial applications. It is well known that aluminum alloys are prone to microstructural corrosion (pitting corrosion, intergranular corrosion, etc.). Laser shock processing (LSP) is a serious candidate versus conventional surface treatments to preserve their integrity and to protect them from pitting corrosion damages. In the present paper, the infl uence of LSP on the resistance to localized corrosion of AA2050-T8 is investigated in chloride media. After polishing, sites containing precipitates show lower pitting potentials (around 0 mV vs Ag/AgCl) than the pure matrix (of about 300 mV). Surface observations indicate that pits initiated at Al-Cu-Fe-Mn precipitates.[...]

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