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通过浸泡实验、析氢实验、SEM和极化曲线测试研究在170°C下不同时效时间对锻造AZ80镁合金腐蚀性能的影响。结果表明:在时效初期阶段,锻造AZ80镁合金腐蚀速率随着时效时间的延长而急剧降低,而时效时间超过20 h后腐蚀速率又缓慢上升。当时效时间小于20 h时,β-Mg17Al12含量随时效时间的延长不断增加,锻造AZ80镁合金腐蚀速率降低;时效39 h后,β相长大,基体中铝含量降低,导致随着时效时间的延长合金腐蚀速率上升。当β-Mg17Al12相含量较低时,试样容易产生点蚀,试样表面呈多孔蜂窝状;反之,当β-Mg17Al12相含量较高时,试样腐蚀较均匀。
The effect of different aging time on the corrosion properties of forged AZ80 magnesium alloy at 170 ° C was studied by immersion test, hydrogen evolution experiment, SEM and polarization curve test. The results show that the corrosion rate of forged AZ80 magnesium alloy decreases sharply with the aging time at the initial stage of aging, while the corrosion rate increases slowly when the aging time exceeds 20 h. When the aging time is less than 20 h, the content of β-Mg17Al12 increases with aging time, and the corrosion rate of forged AZ80 magnesium alloy decreases. After aging for 39 h, the β phase grows up and the aluminum content in the matrix decreases, Prolong the corrosion rate of the alloy. When β-Mg17Al12 phase content is low, the sample is prone to pitting corrosion, the sample surface is porous honeycomb; the contrary, when β-Mg17Al12 phase content is higher, the sample corrosion is more uniform.