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研究了不同时效温度和时间对Mg-15Y合金在3.5%的NaC1溶液中的腐蚀行为的影响,并分析了合金的腐蚀机理。结果表明,225℃时效处理时的峰时效时间为12h,硬度值达到最大,随着时间的延长,硬度值开始下降,并在110℃左右时趋于平缓;随着浸泡时间延长,腐蚀深度和析氢量持续增加;在浸泡时间一定时,合金的腐蚀程度随时效时间的延长先增加后减小,析氢速率先增大后减小,电势电位与腐蚀电流先减小后增大;在同一时效温度下随着时效时间的延长,腐蚀宏观形貌上没有很大的变化,随着时效时间的延长,析氢量先减小后增加。
The effects of different aging temperature and time on the corrosion behavior of Mg-15Y alloy in 3.5% NaC1 solution were studied, and the corrosion mechanism of the alloy was analyzed. The results showed that the peak aging time of 225 ℃ aging treatment was 12h, and the hardness value reached the maximum. With the extension of time, the hardness value began to decrease and tended to be gentle at about 110 ℃. With the prolongation of immersion time, the corrosion depth and The hydrogen evolution rate continued to increase. At a certain immersion time, the corrosion degree of the alloy first increased and then decreased with the extension of the aging time, the hydrogen evolution rate first increased and then decreased, and the potential and corrosion current first decreased and then increased. With the extension of the aging time, there is no significant change in the macro-morphology of the corrosion. With the extension of the aging time, the amount of hydrogen evolution first decreases and then increases.