A study of the properties of metal packaging materials using model corrosive media

• O.V. Bessarab, T.F. Platonova and I.V. Protunkevitch

Russian Research Institute of Canning Technology – Branch of V.M. Gorbatov Federal Research Center for Food Systems of the RAS, Shkolnaya st., 78, Vidnoe place, Leninskiy district, Moscow region, 142703 Russian Federation

Abstract: Internal corrosion of metal cans is one of factors that affect the quality of canned food during the storage period. Thus, one should take into account the corrosivity of canned products when choosing the metal packaging. To rationalize corrosion tests, it is advisable to replace food products with model media. However, it should take into account that the corrosivity of a model medium and a product may be different due to the presence of substances that affect the corrosion rate in the products. The purpose of this work was to study the corrosion kinetics of tinplate in one- and two-component model media containing oxalic and citric acids, as well as in tomato paste mixed with water. The tinplate uniform corrosion rate was measured by the polarization resistance method. The tinplate pitting corrosion rate was measured by the zero-resistance amperometry method. The measurements were performed in automatic mode using an Expert-004 corrosion meter. The results indicated that a solution containing 0.40% citric acid and 0.30% oxalic acid should be used as a model corrosive medium that simulates canned vegetables because it is the most corrosive. The corrosion kinetics tinplate in contact with tomato paste is similar to the corrosion kinetics in the two-component model medium. At the same time, the corrosivity of tomato paste toward tinplate is 2.4 times smaller than that of the model medium (8.54 and 20.46 μm/year, respectively).

Keywords: tinplate, model medium, citric acid, oxalic acid, tomato paste, corrosion rate, uniform corrosion, pitting corrosion, polarization resistance method, zero-resistance amperometry method, Expert-004 corrosion meter, canned vegetable food

Int. J. Corros. Scale Inhib., 2020, 9, no. 3, 912-928 PDF (1 023 K)
doi: 10.17675/2305-6894-2020-9-3-7

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