作者：田洪雷1, 刘攀2, 李景滨2, 孙琳1
作者单位：1. 中车青岛四方机车车辆股份有限公司, 山东 青岛 266111;
2. 中国船舶重工集团公司第七二五研究所（洛阳船舶材料研究所）, 河南 洛阳 471023
关键词：7系铝合金;质量控制图;测量不确定度;电感耦合等离子体-发射光谱法;化学分析;测量系统
摘要：
探讨电感耦合等离子体-发射光谱法测定7系铝合金中铬、铜、铁、镁、锰、钛、锌、硅等8项元素的测量过程质量控制图的建立与应用。采用规范的统计学方法对系列测量结果进行正态性与独立性检验、偏倚检验与精密度检验，建立7175铝合金质量控制样品中上述8个元素的测试过程单值控制图和移动极差控制图。通过叠加指数加权移动平均值，提高较小漂移的检出灵敏度，完整、系统地监控了测量系统的质量运行情况。控制图中没有失控点或失控趋势，实验室的测量系统处于过程、偏倚和精密度受控状态。基于Top-down技术和控制图法，评定测量不确定度，7175控制样品的测量结果可表示为：w（Cr）=0.193%±0.009%，w（Cu）=1.212%±0.041%，w（Fe）=0.135%±0.008%，w（Mg）=2.202%±0.064%，w（Mn）=0.033%±0.002%，w（Ti）=0.024%±0.002%，w（Zn）=5.339%±0.145%，w（Si）=0.080%±0.005%，k=2。上述系列控制图适用于实验室基于电感耦合等离子体-发射光谱法测定7系铝合金中铬、铜、铁、镁、锰、钛、锌、硅等8项元素的分析测量系统的持续监控和评价。该工作为冶金分析、物理测试、环境监测等测量系统的过程质量控制图的建立与应用提供具体的参考示例。
Establishment and application of quality control chart for the determination of 8 elements in 7 series aluminum alloys
TIAN Honglei1, LIU Pan2, LI Jingbin2, SUN Lin1
1. CRRC Qingdao Sifang Co., Ltd., Qingdao 266111, China;
2. Luoyang Ship Material Research Institute, Luoyang 471023, China
Abstract: The establishment and application of control chart in quality control audit for determination of 8 chemical elements (chromium, copper, iron, magnesium, manganese, titanium, zinc and silicon) in 7 series aluminum alloys by inductively coupled plasma optical emission spectroscopy method were discussed. The normality, independence, bias and precision of measurement results of 7175 quality control sample were tested and validated. And the single value charts and moving range charts were established. Moreover, the exponentially weighted moving average charts were plotted, which improved the detection sensitivity of micro drift of the measurement system. The quality control of the measurement system was monitored completely and systematically. There was no out-of-control point or tendency in charts, and the lab’s measurement system was in controlled state. The measurement uncertainties of above results were evaluated based on the ‘Top-down’ approach and statistical control chart method, listed as follows: w(Cr)=0.193%±0.009%, w(Cu)=1.212%±0.041%, w(Fe)=0.135%±0.008%, w(Mg)=2.202%±0.064%, w(Mn)=0.033%±0.002%, w(Ti)=0.024%±0.002%, w(Zn)=5.339%±0.145%, w(Si)=0.080%±0.005%, k=2. The above control charts are applicable to the continuous monitoring and evaluation of analytical measurement system for determination of 8 chemical elements in 7 series aluminum alloy, such as chromium, copper, iron, magnesium, manganese, titanium, zinc and silicon, based on the inductively coupled plasma optical emission spectroscopy method. This work provides a concrete reference example for the establishment and application of quality control chart of measurement systems, such as metallurgical analysis, physical measurement and environmental monitoring.
Keywords: 7 series aluminum alloy;quality control chart;measurement uncertainty;inductively coupled plasma optical emission spectroscopy method;chemical analysis;measurement system
2020, 46(1):56-63 收稿日期: 2019-04-08;收到修改稿日期: 2019-06-06
基金项目:
作者简介: 田洪雷(1976-),男,辽宁盘锦市人,高级工程师,从事轨道交通车辆车体材料的应用与评价技术研究
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