Abstract
ABSTRACTThe efficiency of adding three levels of sodium benzoate (100, 1000, 2500 ppm) in inhibiting corrosion of tin by different organic acid solutions at pH = 3.5 containing 125 ppm nitrate, was tested in canned model packs experiments. Model pH = 3.5 solutions consisting of 1% citric acid, or 1% malic acid, or a mixture of 0.8% citric acid + 0.1% malic acid + 0.1% oxalic acid, and containiig 15% sucrose, 500 ppm ascorbic acid and 125 ppm NO3−, were compared with and without the addition of sodium benzoate. The decrease in the nitrate concentration and the increase in the concentration of tin and iron were followed in the canned model solutions throughout suitable storage periods at room temperature. The amounts of dissolved tin and iron were taken as corrosion criteria. Inhibitory efficiency was expressed as the ratio of corrosion rates in solutions with and without the addition of an inhibitor. Results showed that sodium benzoate gave incomplete protection against corrosion of tin by nitrate. Addition of sodium benzoate, e.g., at 1000 ppm, showed that it is most inhibitive in citric acid, less so in malic acid, and least in the 1% citrio‐malio‐oxalic acid mixture.
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