Determination of metal content in industrial powder ink and paint thickness over steel plates using X-Ray Fluorescence

Guilherme A Lisboa Nogueira; Paulo S Parreira; Felipe Rodrigues Dos Santos; Fábio L Melquiades

doi:10.1016/j.apradiso.2019.05.030

Determination of metal content in industrial powder ink and paint thickness over steel plates using X-Ray Fluorescence

Appl Radiat Isot. 2019 Aug:150:168-174. doi: 10.1016/j.apradiso.2019.05.030. Epub 2019 May 24.

Authors

Guilherme A Lisboa Nogueira¹, Paulo S Parreira¹, Felipe Rodrigues Dos Santos², Fábio L Melquiades³

Affiliations

¹ Applied Nuclear Physics Laboratory, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Pr 445 Km 380, Londrina, PR, Brazil.
² Applied Nuclear Physics Laboratory, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Pr 445 Km 380, Londrina, PR, Brazil. Electronic address: fe.chicoo@gmail.com.
³ Applied Nuclear Physics Laboratory, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Pr 445 Km 380, Londrina, PR, Brazil. Electronic address: fmelquiades@uel.br.

PMID: 31153121
DOI: 10.1016/j.apradiso.2019.05.030

Abstract

The Energy Dispersive X-Ray Fluorescence (EDXRF) is a well stablished technique that may be used in quality control of industrial processes. In this study, it was proposed an analysis of a two commercial powder inks widely used in the industry. The goals were to determine the composition of the ink by quantifying its inorganics elements by EDXRF, and check if the amount of toxic elements matches with Restriction of Certain Hazardous Substances (RoHS) and with "Norma Brasileira" (NBR) regulations. Moreover, to build Partial Least Squares Regression (PLSR) models to predict the thickness of the ink layer applied over steel plates using EDXRF data. Evaluating the quantitative results, it was found that some samples presented toxic elements, such as Cr and Pb. The PLSR results ranged from 54 μm to 97 μm with an average relative deviation of 1% compared to the conventional method used for thickness determination (magnetic method). The results show that EDXRF is a reliable alternative technique to determine the metal elements on the powder ink composition. Furthermore, a (PLSR) model can be used to determine the thickness of the ink applied over steel plates.

Keywords: EDXRF; PLSR; RoHS.