Abstract: The degradable aluminum alloys of different Zn content were prepared by melting technique based on the Al-Mg-Ga-In-Sn alloy. The effect of different Zn content on phase compositions, microstructure and electrochemical parameters of the degradable aluminum alloys were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical workstation. In addition, the degradation rates were conducted in distilled water at 90 ℃. Experimental results showed that the composition, amount and morphology of the precipitates in alloys played an important role in changing the degradation rates. As the increa-sing Zn content, the main precipitation was changed to the dendritic or the network Mg32(AlZn)49 from the clavate Mg2Sn. The degradation of alloys always started along the globular phase which was rich in Mg-In, and spread around it. Obviously, a large amount of Mg was combined into the Mg32(AlZn)49 precipitation, which made both the corrosion proportion and the degradation rate decrease. Therefore, the Mg32(AlZn)49 can delay the degradation of alloys. Moreover, the Ecorr of alloys was shifted to positive values in varying degrees and the icorr decreased gradually. For this reason, the corrosion trend of alloys weakened and the degradation rate decreased in the end.
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2018, Vol. 32 
