锻压技术

镁基汽车电池合金的锻造工艺及组织性能

英文标题：Forging process and microstructure properties of Mg-based automotive battery alloy

作者：李振兴王学军

关键词：Mg1.8Al0.2Ni镁基电池合金多向等温锻造工艺锻造温度耐腐蚀性能充放电循环稳定性

分类号：TG376.9

出版年,卷(期):页码：2021,46(3):15-20

摘要：

采用不同温度进行了Mg1.8Al0.2Ni镁基电池合金的多向等温锻造工艺试验，并与锻造前的合金进行了显微组织、耐腐蚀性能和充放电循环稳定性的对比分析。结果表明：多向等温锻造工艺明显细化了合金晶粒，显著提高了合金的耐腐蚀性能和充放电循环稳定性；随着锻造温度从350 ℃增至450 ℃，Mg1.8Al0.2Ni镁基电池合金的内部组织先细化、后粗化，合金的耐腐蚀性能和充放电循环稳定性均先提高、后下降；与锻造前的合金相比，经350 ℃多向等温锻造后，Mg1.8Al0.2Ni镁基电池合金的腐蚀电位正移了32 mV，充放电循环20 次后放电容量保持率增大了21%，合金的耐腐蚀性能和充放电循环稳定性均得到了显著提高。

The multi-directional isothermal forging process tests of Mg1.8Al0.2Ni Mg-based battery alloy were carried out at different temperatures, and the microstructure, corrosion resistance property and charge-discharge cycle stability were compared and analyzed with the alloy before forging. The results show that the multi-directional isothermal forging significantly refines the grains of alloy and improves the corrosion resistance property and charge-discharge cycle stability of alloy. With the increasing of forging temperature from 350 ℃ to 450 ℃, the internal microstructure of Mg1.8Al0.2Ni Mg-based battery alloy is first refined and then coarsened, and the corrosion resistance property and the charge-discharge cycle stability of alloy are first increased and then decreased. Compared with the alloy before forging, the corrosion potential of Mg1.8Al0.2Ni Mg-based battery alloy after multi-directional isothermal forging at 350 ℃ is positively shifted by 32 mV, the retention rate of discharge capacity increases by 21% after twenty charge-discharge cycles, and the corrosion resistance property and the charge-discharge cycle stability of alloy are significantly improved.

基金项目：

天津市科学技术委员会科研课题(18JCTPJC58500)

李振兴（1988-）,男，硕士，讲师 E-mail：li_zhenxing_love@126.com

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