Abstract
In this study, the corrosion behaviour of friction stir welding (FSW) of AA6061-T3 alloy was investigated. The FSW was performed under two different rotation speed (850 and 950 rpm) and constant travelling speed (22 mm/min). Two tool pin profiles (straight cylindrical and conical types) were utilised to study their impact on corrosion resistance. The corrosion behaviour of the base metal (BM) and weld zone were studied by Tafel polarisation cell using 3.5wt.% NaCl and 3.5wt.% KCl solutions at ambient temperature. The results showed that the welded alloy exhibits lower corrosion resistance than the BM. Lower rotational speed (850 rpm) produced weld with higher corrosion resistance in both NaCl and KCl media. Conical tool pin profile produced weld with corrosion resistance higher than the straight cylinder pin in both NaCl and KCl media. NaCl recorded higher corrosion rate with almost twice of the KCl for all welding conditions.
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