4种铸造镁合金在SBF溶液中的腐蚀行为研究

比较了ZK60、AM60、AZ31和AZ91D等4种铸造镁合金在SBF模拟体液中浸泡72 h的腐蚀性能。利用SEM观察了镁合金腐蚀后的显微形貌,根据失重法计算了镁合金的腐蚀速率,采用极化曲线和电化学阻抗方法进一步评价了镁合金的耐蚀性。研究表明,AZ91D合金腐蚀速率最低,并且呈均匀腐蚀。AZ31合金耐蚀性最差,且点蚀严重,AM60和ZK60合金的耐蚀性相近。

Corrosion Behavior of Four Cast Magnesium Alloys in Simulated Body Fluid

Corrosion behaviour of four cast magnesium alloys (ZK60, AM60, AZ31 and AZ91D) was investigated in a simulated body fluid (SBF) for 72 h by weight-loss method, as well as electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. Their surface morphology after immersion tests was observed by scanning electron microscopy (SEM). The results show that among the four alloys, AZ91D exhibits uniform corrosion with the lowest corrosion rate; AZ31 suffers serious pitting corrosion with the highest corrosion rate; while AM60 and ZK60 alloys exhibit similar corrosion behavior.