摘要
Poor corrosion resistance is a critical barrier to the widespread application of magnesium alloys.Statistically,the literature reported that approximately 70% of as-cast AZ31 magnesium alloys exhibit corrosion rates exceeding 1 mm·y^(-1) in 3.5 wt.%NaCl solution,which is unacceptable for industrial use.Furthermore,there is a considerable discrepancy in the corrosion rates reported by different studies(as-cast alloys ranging from 0.4 to 215 mm·y−1).These phenomena may be attributed to the uncontrollable content of impurity elements in commercial magnesium alloys,which fluctuate widely between batches.In the present work,we prepared as-cast AZ31 magnesium alloys with different impurity contents using two different purities of raw magnesium(Mg-99.9% and Mg-99.99%).The impact of impurity contents on the corrosion resistance of AZ31 magnesium alloys was then analyzed.The AZ31 magnesium alloy prepared with 99.99% raw magnesium showed superior corrosion resistance compared with that prepared with 99.9% raw magnesium,with a reduction in corrosion rate by approximately 98% and a decrease in the fluctuation range of corrosion rate by 91%.Thus,enhancing the purity of raw magnesium is an effective method to improve both the corrosion resistance and consistency of magnesium alloys.
基金
the support of the National Natural Science Foundation of China(52371122,52031011)
Shaanxi Province Foundation for Distinguished Young Scholars(2024JC-JCQN-47)
Shaanxi Province Science and Technology Department Project(2023ZSJD-05HZ).
