Corrosion of Foodstuffs Cans in Saline Solutions Containing Preservative Material
Keywords:Food cans, corrosion of cans, sodium benzoate.
This work involves try to study the corrosion behavior of food can in 200 ppm sodium benzoate which use as preservative material in the absence and presence of three concentrations of sodium chloride (0.001, 0.01, and 0.1 M) to study corrosion resistance of can to pitting due to penetrate chloride ions the passivity layer. This study was performed using potentiostat at scan rate 3 mV.sec-1. Corrosion parameters were measured using Tafel extrapolation method, in addition to calculate corrosion resistance and corrosion rate. The data of corrosion indicate that using sodium benzoate as preservative material give acceptable corrosion resistance of foodstuffs can. The presence of 0.001 and 0.01M NaCl don`t affect on the corrosion behavior of cans, while 0.1M of NaCl in 200 ppm sodium benzoate solution lead to increases of corrosion current density. The increases in corrosion current density may be due to penetrate chloride ions the protective film and the competitive role for chloride and benzoate ions to bonding with metal surface. Also the results of polarization resistance indicate that the resistance decreases only in the presence of 0.1M saline solution with 200 ppm sodium benzoate. Therefore, must avoid the high salinity in the food cans to avoid corrosion of cans and release the toxic metallic ions the foods and drinks.
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