Industrial Dyes as acid Corrosion Inhibitors of Steel

Purpose. Study the inhibitory effect of some industrial dyes in the acid corrosion of steel.

Methods. Industrial dyes of different classes were used as acid corrosion inhibitors: acid violet, active red 5CX, direct diazobordo C, cationic blue, dispersed yellow 4C, single-chromium olive Zh. The value of the inhibitory effect of the dye was determined by the weight method. To determine the possibility of interaction of iron (III) ions with the dye, a spectrophotometric method was used.

Results. All the dyes had a protective effect. Probably, the organic dye film isolates the metal from the corrosive environment, and also changes the structure of the double electric layer at the metal / solution interface. This leads to a slowdown in both chemical and electrochemical corrosion. It was found that dyes with a low inhibitory effect react with iron ions formed during corrosion to form new compounds, which was confirmed by spectrophotometry.

Conclusion. For the first time, such dyes as acid violet, active red 5CX, direct diazobordo C, cationic blue, dispersed yellow 4C, and single-chromium olive W were studied as inhibitors, and their inhibitory effect was compared with the structure of the dye. It was found that the dyes have an inhibitory effect on the acid corrosion of steel, even when added in small quantities. The dyes with the nitrogen atom combined with hydrocarbon radicals have the greatest protective effect, and the least protective effect is that of the azo group, which is confirmed by the absorption spectra of the dyes and their mixtures with iron ions. When the acid concentration increases, it reduces the protective effect of the dye. Over time, the protective effect changes ambiguously. In the acid violet dye, it decreases by 29.5% -37.8%, and in the direct diazobordo dye with an inhibitory effect, on the contrary, it increases by 1.5-2 times over time.

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