Abstract：When tinplate sample was ablated layer by layer by glow discharge spectrometry(GDS), formula integral was set according to glow discharge integral spectrum from sample surface to its center for the purpose of calculating the thickness and mass of tinplate coating and passivation layer, substrate component, harmful elements in the coating, etc. The depth-time diagram was curved by GDS, and it showed that the depth resolution of tin coating was lower than that of substrate iron layer. The method has been applied to determine the mass of tinplate coating and passivation layer, substrate component(carbon, silicon,manganese, phosphorus, sulfur, nickel, chromium and copper), and the relative standard deviation was not higher than 2.3%(n=10),3.0%(n=10) and 4.3%(n=5). The results were consist with those obtained by X-ray fluorescence spectrometry(XRF), spectrophotometry and inductively coupled plasma atomic emission spectrometry(ICP-AES). The harmful elements in the tinplate coating were determined by this method. The method could realize the simultaneous determination of multi testing items in tin plate.
ISO16962-2005 Surface chemical analysis-Determination of zinc and/or aluminum based metallic coatings by glow discharge optical emission spectrometry[S].
