火花放电原子发射光谱测定球墨铸铁的方法研究

Spark Discharge Atomic Emission Spectrometric Analysis of Ductile Iron

球墨铸铁塑性韧性好,成本低,广泛用于汽车、化工、风电等设备的制造;火花放电原子发射光谱分析方便、快捷,广泛用于冶金产品的成分检测,由于球墨铸铁的非白口化状态,其制品无法直接进行光谱分析。通过对球墨铸铁制品试样进行淬火热处理,改变它的表面组织为半白口化状态,结构致密,从而可以进行光谱分析,激发后,被激发的样品表面出现有黑晕的正常激发点,可以读取准确的数据,大大提高了检测速度和效率。对硅、磷、锰、镁的分析精密度RSD分别为0.39%、2.5%、0.83%、10.0%。硅、磷、锰、镁的光谱分析结果与化学分析法的结果的差值均小于允许临界差。大大提高了检测速度和效率。

Due to high plasticity, high toughness and low cost, ductile irons are widely used for equipment manufacturing in automobile manufacture, chemical industry, wind power industry, etc. The spark dis- charge atomic emission spectrometric analysis which is convenient and quick, is also widely used in chemi cal composition analysis for metallurgical products. However, because of non-chilling structure, ductile i- ron can not be directly analyzed by any spectrometry methods. Through quenching treatment, the surface of ductile iron is changed to half-chilling and compact structure and thus can be analyzed by spectrometric methods. The sample surfaces after being sparked have normal black halo around the sparked spot, so that true results can be obtained. The relative standard deviation for silicon, phosphorous, manganese, magnesium is 0. 39%, 2.5%, 0.83%, 10.0%, respectively. The differences between chemical results and spectrometric results are less than the critical variation. The analysis speed and efficiency are improved significantly.