Abstract
The effects of Zr addition on localized corrosion resistance of Al–Zn–Mg alloy were investigated by means of intergranular corrosion (IGC) immersion and exfoliation corrosion (EXCO) immersion tests. The mechanism was discussed based on microstructural characterization by optical microscopy (OM) and scanning transmission electron microscopy (STEM). The results showed that Al–Zn–Mg–Zr alloy exhibited a smaller intergranular corrosion depth and exfoliation corrosion depth than Al–Zn–Mg alloy. Zr inhibited recrystallization and refines grains. The subgrain boundaries could retard the propagation of corrosion. Compared with Al–Zn–Mg alloy, Al–Zn–Mg–Zr alloy has lower Zn and Mg content of the grain boundary precipitates and narrower precipitate free zone near grain boundaries.
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