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| Effects of Aging Treatment on Corrosion Properties of 1975 Aluminum Alloy |
| ZHAO Kai, YIN Zhimin, DUAN Jiaqi, DENG Ying |
| School of Material Science and Engineering, Central South University, Changsha 410083, China |
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Abstract The intergranular corrosion, exfoliation corrosion, stress corrosion properties of 1975 aluminum alloy with different aging treatments were investigated using constant temperature immersion corrosion method, polarization curve measurement, optical microscopy, scanning electronic microscopy (SEM) and transmission electron microscopy (TEM) analysis. The results showed that the sensibility of intergranular corrosion, exfoliation corrosion and stress corrosion of 1975 aluminum alloy arranged in order as followed：underaging (120 ℃/12 h)>peak-aging (120 ℃/24 h)>overaging (120 ℃/36 h), which was attributed to the characteristic of grain boundary precipitation phase η (MgZn2) and precipitation free zone (PFZ). When the equilibrium phase η distributed uncontinuously and had large size as well as the PFZ was wide, the corrosion sensibility was low．In contrast, when the grain-boundary equilibrium phase had continuous distribution and small size, the corrosion sensibility was high.
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