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Influence des enzymes sur la corrosion localisée d'un acier inoxydable en eaux douces : cas de la glucose-oxydase

Abstract : When stainless steels are immersed in seawater, biofilm formation is responsible of a free potential increase. An enzymatic model has been finalised to explain this behaviour based on an oxidase enzyme which generates oxidising species that would favour the cathodic reaction. The aim of this study is the validation of this enzymatic model in an aqueous environment at the beginning of the exposure with low ions content. 20 mM of glucose and various glucose oxidase concentrations (10 to 10000 units per liter (u/L)) have been added to the 1000 ppm Cl + 500 ppm NO3- + 500 ppm S04-2 initial solution. The potential evolution of an AI SI 304 stainless steel has been studied. Glucose had no influence on these potentials. Glucose oxidase has led in 30 minutes to a +250 mV increase of the free potential, Ecorr, for all concentrations above 10 u/L. For these contents, the enzymatic activity was sufficient to produce enough hydrogen peroxyde. On the other hand, glucose oxidase concentration acted firstly upon the initial evolution of Ecorr, which can be related to the enzymatic kinetic, and secondly upon the pH of the solution. During galvanostatic tests the evolution of passivation was the same, whatever the glucose oxidase concentration. Presence of glucose oxidase, whose passivity trend depends of hydrogen peroxyde production, did not alter the inhibiting effect of nitrates and sulphates anions added to a 1000 ppm Cl- solution.
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Submitted on : Friday, January 8, 2016 - 4:03:00 PM
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E. Courtehoux, C. Dagbert, J. Galland, D. Féron. Influence des enzymes sur la corrosion localisée d'un acier inoxydable en eaux douces : cas de la glucose-oxydase. Matériaux & Techniques, EDP Sciences, 2002, 90 (7-8), pp.55-61. ⟨10.1051/mattech/200290070055⟩. ⟨hal-01253082⟩



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