Corrosion behaviour of polymer‐laminated steel in sodium chloride solution

Abstract

AbstractThe corrosion behaviour of polymer‐laminated steel in sodium chloride (NaCl) solution was studied. The iron migration amount was determined by inductively coupled plasma optical emission spectrometry (ICP‐OES). The result indicated that the migration of iron increased with time and a turning point occurred in 3 wt.% NaCl solution when polymer‐laminated steel cans containing NaCl solution soaked at different temperatures for 240 h. In addition, the changes of the PET/TiO2 composite film after soaking were analysed by the differential scanning calorimeter (DSC), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The crystallinity of the composite film decreased, the porosity increased and the surface cracks formed. Moreover, the composition and morphology of the corrosion products were characterized by the X‐ray diffraction (XRD), SEM and EDS, indicating that the corrosion products were Fe3O4 and Fe2O3. Based on the results, a schematic diagram of the corrosion mechanism of polymer‐laminated steel cans was given.