摘要
为了进一步探讨硼元素对铝合金用作牺牲阳极性能的影响,观察了5组不同硼含量铸铝合金的显微组织,通过动电位扫描研究了铸铝合金在不同温度下3.5%NaCl溶液中的电化学行为。结果表明:硼含量主要影响合金的晶粒大小、树枝晶和第二相粒子的形态分布,硼含量为0.024%时可得到细小均匀的等轴晶组织,其开路电位最负,在不同介质温度下极化曲线平缓,阳极表面活性好。
Five kinds of cast Al alloys(Al-Zn-In-Sn-Ti) with different boron content were fabricated.The microstructure of as-prepared Al alloys was observed with a metallographic microscope.Their electrochemical properties in 3.5% NaCl solution of different temperature were evaluated by potentiodynamic method,and the effect of B content on the electrochemical properties of as-prepared Al alloys as sacrificial anodes was examined.Results show that the content of alloying element B has significant effects on the grain size as well as dendrite morphology and distribution of the second phase particles.As-prepared Al alloy containing 0.024% B(mass fraction) consists of small equiaxed crystals and has the most negative open circuit potential,showing gently varying polarization curves in different temperature of medium and good activity as sacrificial anodes.
出处
《材料保护》
CAS
CSCD
北大核心
2012年第11期22-23,26,共3页
Materials Protection
基金
陕西省科技计划项目(2007 K06-12)资助
关键词
牺牲阳极
铸铝合金
硼含量
温度
组织形貌
电化学性能
sacrificial anode
cast Al alloy
boron content
temperature
microstructure
electrochemical properties
