Electrochemical Behaviour and X-ray Fluorescence Study of AgNP-GO-CS Coated AISI 303 Austenitic Stainless Steel and Ceramic Commercial Products

Herein, the performance of stainless steel and ceramic commercial cooking utensils was investigated under varying temperature, hydrogen evolution and pH. X-ray fluorescence (XRF) analysis was used to determine the elemental composition of commercial products manufactured by a local company. Prior to XRF analysis, the products were immersed in universal buffer for 2 days at different pH and temperature values before and after coating with silver nanoparticles/graphene oxide/chitosan. Release assessments were performed for both types of commercial utensils. Total reflection XRF was used to precisely examine the wt% of Cr, Mn, and Ni for the stainless steel sample and Si, Ti, and Ba for the ceramic sample after immersion under certain conditions. The ion release from both materials was temperature- and pH-dependent before and after nanocoating. All experiments showed that the lowest hydrogen evolution and amount of release for both commercial utensils occurred at low temperature and high pH values with this nanocoating. The coatings were also studied electrochemically; the stainless steel was more passive than the ceramic without coating. After coating, they were comparable at temperatures of 75 - 250 °C from pH 5 - 11, where the ceramic performed better than the stainless steel and was more passive. The novel nanocoating reported in this work will enable both customers and manufactures to upgrade the quality of their products.