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The corrosion inhibition of steel in the hydrochloric acid solution by N-butylquinolinium bromide and 1-octyl-3-methylimidazolium chloride was investigated using electrochemical and weight loss methods. Both compounds under investigation act as mixed type inhibitors with predominantly anodic action. The Gibbs energy of adsorption was calculated by means of the Langmuir isotherm. The inhibition efficiency of 1-octyl-3-methylimidazolium chloride was higher. Daphnia magna was used as acute toxicity test organism. 1-octyl-3-methylimidazolium chloride was more toxic than N-butylquinolinium bromide. The LC50 value (48 hours) for 1-octyl-3-methylimidazolium chloride for acute test on Daphnia magna was 0.020 mgl-1 and it was 1.271 mgl-1 for N-butylquinolinium bromide. 1-octyl-3-methylimidazolium chloride can be classified as extremely toxic substance (LC50 is 0.01-0.1 mgl-1) and N-butylquinolinium bromide can be classified as moderate toxic substance (LC50 is 1-10 mgl-1).
Keywords: Daphnia magna; N-butylquinolinium bromide; 1-octyl-3-methylimidazolium chloride; corrosion inhibition; steel© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.