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

Silviu-Gabriel STROE, Gheorghe GUTT, Silvia MIRONEASA

Abstract

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.

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