engleski

Investigation of corrosion in print production

The phenomenon of corrosion is present in the processes of graphic reproduction ; however, it has never been a great concern in discussions and research. Nevertheless, an ad hoc poll showed that 8 out of 10 printers can indicate, or at least are aware of the effect of corrosion in printing processes, some of them experiencing problems on printing machines. Corrosion in the process of printing can be caused by a number of different reasons. They seem to be more evident with the use of ecological inks and fountain solutions. This paper deals with investigation of corrosion processes on construction steel in contact with different electrolytes (normal and distilled water, electrolytes of different conductivity and pH value), as well as aqueous solutions of surface coatings of high gloss and standard offset papers. During the period of four months changes in the mass of steel specimens were measured (loss of material), as well as changes in pH values and conductivity of the examined electrolytes. Formation of corrosion products on the surface was identified by changes of spectrophotometric remission in the visible portion of the spectrum for steel. After four months of exposure to electrolytes, corrosion products on the surface of steel were determined by FT-IR spectral recordings. This investigation gave an insight into dynamics and mechanisms of corrosion under conditions close to those in printing production, thus facilitating better understanding of the entire process.

corrosion, fountain solution, FT-IR, spectrophotometry

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