Effect of tensile pre-stretching on local corrosion properties of 2219 aluminum alloy sheets
The influence of pre-stretching (0-10％) on the local corrosion resistance of 2219 aluminum alloy sheet was investigated by means of immersion test,electrochemical tests,scanning Kelvin probe force microscopy (SKPFM),electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM).The maximum corrosion depth and corrosion current tend to decrease with the increase of pre-stretching and the dominant corrosion form changes from intergranular corrosion to pitting,indicating corrosion resistance increases.The maximum corrosion depth decreases significantly with pre-stretching increasing from 0％ to 4％,and then slowly beyond 4％.The reason was discussed based on the microstructural and microchemical features at grain boundaries,as well as the change in volta potential within the grains and grain boundaries.
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