Effect of rolling ratios on the microstructural evolution and corrosion performance of an as-rolled Mg-8 wt.%Li alloy

In this work, the influence of rolling ratios on microstructural changes and corrosion behavior of an as-rolled Mg-8 wt.%Li alloy in 0.1 mol/L NaCl solution has been investigated. It revealed that with the rolling ratio being increased from 3 to 10, the alpha-Mg phases were elongated and fragmented, whilst the area fraction of exposed beta-Li phases increased. Meanwhile, the corrosion performance of the alloy decreased with the increased rolling ratios. For all the samples, their corrosion processes were quite similar and can have two stages. At the initial stage with the samples being immersed for less than 6 h, the corrosion mainly occurred in beta-Li phases. When the samples were immersed for longer than 6 h, the corrosion attack transferred to alpha-Mg phases and the hydrogen evolution rate was accelerated. (C) 2020 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.

Automated summary

The influence of rolling ratios on microstructural changes and corrosion behavior of an as-rolled Mg-8 wt.%Li alloy in 0.1 mol/L NaCl solution was investigated. It was found that as the rolling ratio increased, the alpha-Mg phases elongated and fragmented, leading to decreased corrosion performance. The corrosion process can be divided into two stages, with initial corrosion mainly occurring in beta-Li phases and later transferring to the alpha-Mg phases.