Recent progress in corrosion protection of friction stir welded high-strength aluminum alloy joints

Friction stir welding（FSW） has been widely used in many industries,with which high-strength aluminum alloys can be well joined.However,the corrosion resistance of FSW high-strength Al alloy joints is relatively poor,which limits their industrial applications.The joints shall be protected against corrosion.In this review,therefore,the current status and development of corrosion protection for FSW high-strength Al alloy joints are presented.Particular emphasis has been given to different protection methods;lowering heat input,post-weld heat treatment,surface modification and spray coatings.Finally,opportunities are identified for further research and development in corrosion protection of FSW high-strength Al alloy joints.