摘要
通过热力学计算和实验,研究了氟硼酸钾(KBF4)对AZ91镁合金熔体除铁的可行性和除铁效果。结果表明:在740℃,加入镁合金量1.2%的KBF4进行精炼处理,并保温静置30min,可使合金中铁含量从0.0237%降到0.0032%。5%NaCl溶液浸蚀实验表明,镁合金的腐蚀速率从除铁前的55.3mg.cm-2.day-1降到除铁后的4.5mg.cm-2.day-1。在利用KBF4对镁合金熔体除铁的同时,又能使合金晶粒得到显著细化。
The thermodynamic feasibility of KBF4 on Fe reduction was calculated in the process of AZ91 magnesium alloy smelting. When the molten was treated with 1.2% KBF4 of the melt at 740℃ for 30 min, the Fe content could be reduced from 0. 023 7 wt% to 0. 003 2 wt%. Immersion corrosion tests of 5% NaCl solution were conducted to evaluate the corrosion resistance of magnesium alloy. The immersion corrosion rate was reduced from initial 55.3 mg · cm^-2 · day^-1 to 4.5 mg · cm^-2 · day^-1 When the Fe content decreased, the as-cast microstructures of AZ91 magnesium alloy were also refined obviously.
出处
《铸造技术》
CAS
北大核心
2009年第8期1042-1046,共5页
Foundry Technology
关键词
镁合金
除铁
氟硼酸钾
晶粒细化
Magnesium alloy
Iron reduction
Potassium fluoborate
Grain refinement
