Electrolytic take samples from steels

Abstract

Based on the electrolytic dissolution principle and the characteristics of an anion-exchange membrane which hinders cation passage, a novel procedure for dissolving steel is described. The dissolver is a dual-cavity electrolyser with the membrane placed between the cavities. As iron is the base element in steels it was determined titrimetrically in order to permit the dissolved amount of steel to be evaluated. Restrictions to this procedure are discussed. For a 200 mA electrolytic current and 0.25 h of electrolysis, the amount dissolved from no. 33 steel was 0.054 83 g (s_r= 0.44% m/m, n= 10). Manganese, chromium, nickel and tin in two steels were determined spectrophotometrically as 0.325% m/m Mn (s_r= 2.21%), 0.0243% m/m Cr (s_r= 2.76%), 0.008 35% m/m Ni (s_r= 13.1%) and 0.0634% m/m Sn (s_r= 2.96%) for no. 33 steel and 0.663% m/m Mn (s_r= 1.85%), 0.0098% m/m Cr (s_r= 7.62%) and 0.0035% m/m Ni (s_r= 11.3%) for no. 45 steel. These data are in agreement with certified values.