Al–Li alloys have higher mechanical properties and are more lightweight than pure aluminum and other aluminum alloys. The element lithium is highly active; therefore, it is necessary to evaluate corrosion behaviors of Al–Li alloys. However, the existed methods and indicators that compare their corrosion properties are hard to characterize the continuous variations of corrosion performances with time. The potentiostatic polarization measurement is first proposed to compare corrosion resistances of Al, Al–Li alloy 2A97, and Al alloys 2024, 6061, 7050 in this study. Polarization current densities of these materials are measured. Then, equivalent resistances and charges amounts are respectively derived by Ohm's law and integration. Mass losses of these materials are calculated with Faraday's law. Measured current densities and three derived indicators above are applied to compare corrosion behaviors of these materials. Comparative results indicate that alloy 2A97 possesses the best corrosion property at the initial corrosion stage. During steady corrosion processes, the corrosion resistance of alloy 2A97 is better than those of alloys 2024, 6061, and Al except alloy 7050.

中文翻译：

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用于比较 Al、Al-Li 合金 2A97 和其他铝合金腐蚀行为的新型指标组合

铝锂合金比纯铝和其他铝合金具有更高的机械性能和更轻的重量。元素锂是高活性的；因此，有必要评估 Al-Li 合金的腐蚀行为。然而，现有的比较它们的腐蚀性能的方法和指标很难表征腐蚀性能随时间的连续变化。本研究首次提出恒电位极化测量来比较 Al、Al-Li 合金 2A97 和 Al 合金 2024、6061、7050 的耐腐蚀性。测量这些材料的极化电流密度。然后，通过欧姆定律和积分分别推导出等效电阻和电荷量。这些材料的质量损失是用法拉第定律计算的。测量的电流密度和上述三个派生指标用于比较这些材料的腐蚀行为。对比结果表明，合金2A97在腐蚀初期具有最好的腐蚀性能。在稳定腐蚀过程中，合金2A97的耐腐蚀性能优于合金2024、6061和除7050以外的Al。