电感耦合等离子体质谱法测定CMSX-4镍基高温合金中的镧和铈

Determination of lanthanum and cerium in CMSX-4 nickel-based superalloys by inductively coupled plasma mass spectrometry

CMSX-4是目前世界上应用最广泛的第二代镍基单晶高温合金,在CMSX-4中添加微量的镧(La),铈(Ce)等稀土元素可以显著提高合金的抗氧化性和耐腐蚀性。本文建立了湿法消解-电感耦合等离子体质谱法(ICP-MS)同时测定CMSX-4镍基高温合金中La, Ce元素含量的方法。样品经王水-HF常压加热溶解,利用HClO4冒烟消除F-的干扰,优化了溶样用酸的量和消解条件。在优化条件下,方法的检出限为La 0.23μg/g, Ce 0.85μg/g,加标回收率为95.0%~98.9%,相对标准偏差(RSD)为1.3%~3.9%,能够用于对CMSX-4镍基高温合金中微量La和Ce元素的准确、快速测定。

CMSX-4 is the second-generation nickel-based single crystal superalloy used widely in the world.The oxidation resistance and corrosion resistance of CMSX-4 alloy can be improved by adding trace lanthanum(La),cerium(Ce)and other rare earth elements.A method for the simultaneous determination of La and Ce in CMSX-4 nickel-based superalloy by wet dissolution-inductively coupled plasma mass spectrometry was established.The sample was heated and dissolved under normal pressure by aqua regia and hydrofluoric acid,and the interference of fluorine ion was eliminated by using perchloric acid.The amount of dissolved acid and the digestion conditions were optimized.The limits of detection were 0.23μg/g for La and 0.85μg/g for Ce under optimized conditions.The spiked recoveries were 95.0%-98.9% with the relative standard deviations of 1.3%-3.9%,which can meet the requirements of accurate and rapid determination of La and Ce in CMSX-4 nickel-based superalloy.