1982 Volume 68 Issue 3 Pages 523-528
On emission spectrometric analysis of pig iron by using a triggered capacitor discharge source, the influence of precipitated graphite on an analytical result and its prevention were investigated. The followings were obtained.
The abnormal emission on the analysis of pig iron was caused by the preferential discharge to precipitated graphite. This preferential discharge was similar to that caused by non-metallic inclusions in steel. The preferential discharge was improved by the rapid formation of spark hardened layer, which was achieved by the prolonged preburn time or the discharge with high energyspark. The pulse height distribution analysis method was also effective for the elimination of abnormal emission. Consequently, pig iron could be analysed rapidly with a triggered capacitor discharge source, and the analytical precision and accuracy were comparable to those with a high voltage spark source.