Abstract
Through traditional corrosion method of aluminum alloy weld could only get a black-and-white metallographic structure. Color metallographic structure could be got by using color metallographic technique, which could improve discrimination of metallographic structure. The welding test pieces were got by using A7N01 and A6N01 aluminum sheets as base metal and E5356 and E4043 as welding wire. Through sampling, mounting, grinding and polishing process, metallographic specimens were obtained. Contrast test of aluminum alloy specimens was investigated. Conventional Keller’s reagent corrosion results showed the grain outline was not very clear and the grain boundary was fuzzy. Color metallographic corrosion results showed both the grain outline and boundary were very clear. Grains of different orientation and composition segregation presented different color. So color can be used to distinguish orientation and composition segregation. Color metallographic technique was better than black-and-white metallographic technique to observe the metallographic structure.
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