Friction stir-welding of Aluminum alloy has become widely practiced in the fabrication of light-weight structures requiring high strength-to-weight ratios and superior corrosion resistance. The friction stir-welding (FSW) process and tool parameters play a key role in determining the joint’s characteristics. As we know every environment has some degree of corrosion. The corrosion behavior of FSW aluminium alloys has been studied in recent years. Aluminium alloys 6061 and 7071 with the thickness 6mm were weld by Friction stir-welding of different rotational speed of tool (1200, 1400 and 1600 rpm) and also with different transverse feed of tool (25 and 50 mm/min) at constant axial load 4KN.The corrosion behavior of weldment was studied with 65% of HNO3 solution. Immersion test has been carried out with different specimen taken from different weld parameters. Then weight loss of the specimen taken for the study of rate of corrosion. © Research India Publications.