Research on Corrosion Control Factors of 2A02 Aluminum Alloy of Different States before and after Laser-Shock-Processing

Abstract

The variation of corrosion behaviors and microstructure of 2A02Aluminum alloy before and after Laser Shock Processing (LSP) were analyzed, and the effects of LSP on corrosion resistance of the alloy were explored. The results show that the corrosion resistance of aluminum alloys with different aging conditions is quite different before and after laser shock. The corrosion potentials of the aluminum alloys with different aging conditions vary with the initial state, the natural aging state, the two aging stages (150°C/6h, 190°C/6h, 8h+160°C/6h), indicating that the grain size and morphology and distribution of precipitated phase under different aging conditions before impact are the main controlling factors in the process of corrosion. The micro-analysis revealed that LSP can form a compact strengthened layer at the surface of the material and can refine grains, at this point the strengthening effect caused by LSP was the main controlling factor in the corrosion process.