THE RELATIONSHIP BETWEEN METAL IONS RELEASED FROM AISI304 AND AISI321 STAINLESS STEELS IN FOOD SIMULANT SOLUTIONS AT VARIOUS WORKING PARAMETERS

摘要

The aim of this study was to apply statistical techniques to analyze the experimental data obtained from accelerated migration tests of metal ions from different stainless steels grades in simulated environments foods. For this purpose it was used principal component analysis (PCA) to the metal ions analyzed in acetic acid solutions (3%, 6% and 9% in double-distilled water) at different working parameters, in order to get an overview of the data obtained and to find which variables are related, and which variables are the most important in distinguishing between samples. For AISI304 stainless steel grade was studied the migration of Cr, Mn, Fe and Ni ions and for AISI321 stainless steel grade was studied the migration of Cr, Mn, Fe, Ni and Ti ions. The correlations between all determined varibles were studied using Pearson's coefficients with statistical significance at p<0.05. Significant correlations between metal ions released in food simulant solution of 3%, 6% and 9% concentrations for AISI304 and AISI321 were found. This study demonstrated that the principal component analysis (PCA) is useful for interpreting data set, providing informations about the relationships between metal ions analyzed release in food simulant solutions from both stainless steel grades, at various working parameters. The results indicate a high Cr and Mn content comparatively with iron and nickel content released from AISI304 in food simulant 6% concentration. High iron content comparatively with chromium and nickel content was realeased from AISI321 in acid food simulant 3% concentration and a high Fe and Ni content comparatively with Cr and Mn content was realeased from same stainless steel grade in food simulant 9% concentration.