X射线荧光光谱法测定6016铝合金钝化膜的锆钛含量

Determination of zirconium and titanium contents in passivation film on 6016 aluminum alloy by X-ray fluorescence spectrometry

使用手持式能量色散型 X 射线荧光光谱仪建立了检测 6016 铝合金表面锆钛钝化膜中锆和钛含量的方法,工作曲线的线性相关指数均大于 0.999,检出限分别为 0.66 mg/m^2和 1.23 mg/m^2。以标样回测和实验室间比对的方式考察了该方法的准确性,标样回测相对误差优于±4%,实验室间误差优于±0.50 mg/m2,方法的精密度约为 3.5%(测量 5 次)。考察了软圆凳、白色电脑桌、木圆凳、黑色实验桌和瓷砖地板这 5 种样品支撑背景的影响,发现它们对检测结果均有正干扰。检测时应避免样品与支撑背景直接接触,让其至少保持 30 cm 的距离。该法可在生产现场快速、准确地测定 6016 铝合金钝化膜的锆、钛含量,为钝化生产工艺控制提供重要参考。

A method for determination of Zr and Ti contents in passivation films on 6061 aluminum alloy by using hand- held X-ray fluorescence spectrometer was established. The square of linear correlation coefficients of the working curves were larger than 0.999. The detection limit was 0.66 mg/m ^2 for Zr and 1.23 mg/m^2 for Ti. The accuracy of the method was evaluated by redetermination of standard samples and interlaboratory comparison. The relative error in redetermination test was within ±4% and the interlaboratory error was better than ±0.50 mg/m^2. The repeatability was about 3.5% when the number of repeated samples was 5. The effects of five structures i.e. soft round stool, white computer desk, round woody stool, black test table, and tile floor for supporting the sample as background on the determination result were studied. The results showed that all of them had positive interference on the determination results. The sample to be tested should not be in touch with the support background directly, and the distance between them should be kept at least 30 cm. The method could be used for onsite fast and accurate determination of Zr and Ti contents in passivation films on 6016 aluminum alloy, providing important support to process control in aluminum passivation line.