ABSTRACT

The AZ91D magnesium alloy was processed with the addition of chemical refinement Al5Ti1B or through ultrasonic melt treatment technique. This paper studies the relationship between the corrosion behaviour and the phase’s morphology of the produced samples. Electrochemical impedance spectroscopy was carried out in Hank’s solution at 37°C for the assessment of corrosion resistance, demonstrating that this property is heavily affected by the change in morphology provided by the applied methods. Correlation analysis suggests that small concave boundaries of the coarser β-Mg phase have a greater impact on corrosion behaviour rather than the reduction in β-Mg volume fraction or the overall homogenisation of the morphology.

摘要

AZ91D镁合金通过添加化学细化Al5Ti1B或通过超声熔体处理技术进行加工。本文研究了腐蚀行为与所生产样品的相形貌之间的关系。电化学阻抗谱是在 37°C 的 Hank 溶液中进行的，用于评估耐腐蚀性，表明该特性受到应用方法提供的形态变化的严重影响。相关性分析表明，较粗的β- Mg 相的小凹边界对腐蚀行为的影响更大，而不是β- Mg 体积分数的降低或形态的整体均匀化。