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采用扫描电镜、透射电镜、X射线衍射、电化学性能测试等方法,研究了析出相对Al-5Zn-0.03In-1Mg-0.05Ti-0.5Mn合金牺牲阳极腐蚀行为的影响。结果表明,该合金主要含MgZn2(η相)及Al6Mn析出相,这些析出相相对α(Al)基体呈阳极相,在3.5%NaCl溶液中与α(Al)基体组成腐蚀微电池,引起析出相自身溶解。析出相的溶解一方面活化牺牲阳极合金,另一方面过多的析出相降低合金电流效率。因此适量且均匀分布的η及Al6Mn析出相有利于该牺牲阳极合金综合电化学性能的提高。
The effects of precipitation on the sacrificial anode corrosion behavior of Al-5Zn-0.03In-1Mg-0.05Ti-0.5Mn alloy were investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and electrochemical tests. The results show that the alloy mainly contains MgZn2 (η phase) and Al6Mn precipitates. These precipitates are in the form of anodic phases with respect to the α (Al) matrix. In 3.5% NaCl solution, the alloy precipitates with α (Al) Dissolve itself. The dissolution of the precipitated phase activates the sacrificial anode alloy on the one hand and excess precipitated phase on the other hand reduces the alloy current efficiency. Therefore, proper and uniform distribution of η and Al6Mn precipitated phase is conducive to the sacrificial anode alloy electrochemical performance improvement.