Abstract
The 6061- T6 aluminium alloy was modified by multi- pass friction stir process with air or water cooling. Corrosion behavior of the processed zone was investigated by immersion test and electrochemical corrosion test, as well as optical microscopy, SEM and TEM. The results show that the grain size of stirred zone was successfully refined and its corrosion resistance became better obviously after the base metal was modified by FSP with different cooling methods. Compared with the base metal, the nugget zone exhibited higher free-corrosion potential, smaller corrosion current density and greater corrosion impedance. Compared to FSP with water-cooling, the nugget zone prepared by FSP with air-cooling showed better corrosion resistance.
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