摘要
经典的火花源原子发射光谱(Spark-OES)及辉光放电原子发射光谱(GD-OES)较难分析不规则导电小样品,实验采用激光诱导击穿光谱(LIBS)法对电路板上的发光二极管(LED)管脚和印刷电路板(PCB)固定螺钉两个不规则细小样品表面的锈蚀进行了深度与成分分析。深度曲线表明发光二极管管脚样品表面镀有Sn、Ni、Cu等元素,螺钉样品表面镀有Ni元素,镀层界面下则是低合金钢材料。采用一套低合金钢GSBH40068-93建立校准曲线,可定量分析界面下铁基样品的C、Mn、P、S、Cu、Ni含量。发光二极管管脚及PCB的螺钉样品很细小,且表面生锈很严重,较难用湿法化学分析,在同样的分析参数条件下,对编号为11278的中低合金钢样品分别采用LIBS及Spark-OES进行准确度和精密度考察,结果表明二者准确度相吻合,但LIBS数据的精密度略逊于Spark-OES,除P、S元素外,其余元素的相对标准偏差(RSD)均在5%以下。
Irregular conductive small samples were difficult to be analyzed by classical spark source optical emission spectrometry （Spark-OES） and glow discharge optical emission spectrometry （GD-OES）.The depth and composition analysis of surface corrosion of two irregular small samples,i.e.,the set screw of light emitting diode （LED） and printed circuit board （PCB） on circuit board were performed by laser-induced breakdown spectroscopy （LIBS）.The depth curve indicated that the surface of pin sample of LED had coating elements such as Sn,Ni and Cu.The screw sample surface was covered by Ni.It was low alloy material under coating layer interface.The calibration curve was established by using a set of low alloy steel standard samples （GSBH40068-93）.The content of C,Mn,P,S,Cu and Ni in iron-based sample under interface could be quantitatively analyzed.The screw sample of LED pin and PCB was very tiny,and the rusting on the surface was serious,so it was not suitable for wet chemical analysis.Under the same analysis parameter conditions,the accuracy and precision tests of middle-low alloy steel sample （No.11278） were conducted by LIBS and Spark-OES.The results showed that,the accuracy of the two methods was consistent.However,the precision of LIBS data was slightly inferior to Spark-OES.Except for P and S,the relative standard deviations （RSD） of other elements were all less than 5 ％.
出处
《冶金分析》
CAS
CSCD
北大核心
2013年第10期1-5,共5页
Metallurgical Analysis
基金
国家重大科学仪器开发专项(2011YQ14047)
关键词
激光诱导击穿光谱
不规则细小导电样品
深度分析
laser-induced breakdown spectroscopy
irregular and small conducting sample
depth profile analysis
