Relationship between extrusion temperature and corrosion resistance of magnesium alloy AZ61
Relationship between extrusion temperature and corrosion resistance of magnesium alloy AZ61
复制标题
镁合金AZ61挤压温度与耐腐蚀性能的关系
DOI：
10.3139/120.111155
复制
发表时间：
2018
影响因子：
2.5
通讯作者：
Dingfei Zhang
中科院分区：
文献类型：
--
作者：
Hong Jun Hu;Yulei Ying;Dingfei Zhang
摘要镁合金挤压-剪切成形是一种新的塑性变形技术，它结合了一步直接挤压和两步等径角挤压。通过浸泡试验和电化学试验，研究和评价了电喷雾沉积AZ 61镁合金在不同铸坯温度下的耐腐蚀性能。通过对试样腐蚀形貌、腐蚀产物成分和相组成的分析，研究了Cl-浓度、浸泡时间和pH值对试样腐蚀行为的影响。实验结果表明，与400 ° C相比，440 ° C下电火花加工的试样具有更高的耐蚀性，这可能是由于晶粒尺寸减小和金属间化合物颗粒在显微组织中的重新分布。
Abstract The extrusion-shear (ES) process for magnesium alloys is a newly developed plastic deformation technique, which combines one step of direct extrusion and two steps of ECAP (equal channel angular pressing). Corrosion resistances of the AZ61 magnesium alloy fabricated by ES with different billet temperatures have been investigated and evaluated through immersion and electrochemical tests. Influences of Cl- concentrations, immersion times and pH values on the corrosion behaviors of samples have been evaluated by analyzing corrosion morphologies and compositions, and phase compositions of corrosive products by using SEM and X-ray diffraction. According to the experimental results, samples processed by ES at 440 °C billet temperature have a higher corrosion resistance than those prepared at a billet temperature of 400 °C, which might be attributed to the grain-size reduction and the redistribution of inter-metallic particles within microstructures.