Ennoblement of stainless steel in the presence of glucose oxidase: Nature and role of interfacial processes

• Published in: Journal of colloid and interface science Vol. 320; no. 2; pp. 508 - 519
• Main Authors: Landoulsi, J., Genet, M.J., Richard, C., El Kirat, K., Rouxhet, P.G., Pulvin, S.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 15.04.2008; Elsevier
• Subjects: AFM; Biocorrosion; Chemical engineering; Chemical Sciences; Chemistry; Colloidal state and disperse state; Corrosion; Electrochemistry - methods; Exact sciences and technology; Fresh Water - chemistry; General and physical chemistry; Glucose - chemistry; Glucose oxidase; Glucose Oxidase - chemistry; H 2O 2; Hydrogen Peroxide - chemistry; Iron oxides; Material chemistry; Organic contamination; Oxygen - chemistry; Passive film; Stainless steel; Stainless Steel - chemistry; Surface physical chemistry; XPS; H 2O 2; Glucose oxidase; Passive film; Stainless steel; Organic contamination; AFM; XPS; Biocorrosion; Iron oxides; Atomic force microscopy; Iron oxide; Hydrogen peroxide; Enzyme; Film; Transition element compounds; X ray; H2O2; Contamination; Photoelectron spectrometry; Oxidoreductases
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2008.01.038

The ennoblement of the free corrosion potential ( E corr ) of AISI 316L stainless steel which did not occur in synthetic fresh water (SFW), was observed after introduction of glucose oxidase (Gox) and glucose, or of hydrogen peroxide (H 2O 2). The composition of the surface was monitored using AFM and XPS, a detailed XPS analysis being based on the discrimination between oxygen of organic and inorganic nature proposed in a previous study. In H 2O 2 medium, the main changes regarding the inorganic phase were the increase of the oxygen concentration in the passive film, the increase of the molar concentration ratio of oxidized species Fe ox/Cr ox and the growth of nanoparticles, presumably made of ferric oxide/hydroxide. In Gox medium, no significant changes were observed in both oxygen concentration and Fe ox/Cr ox ratio, but the density of colloidal particles decreased, indicating a dissolution of Fe oxide/hydroxide under the influence of gluconate. In contrast with H 2O 2, in SFW and Gox the amount of organic compounds increased due to the accumulation of polysaccharides and proteins. The influence of glucose oxidase on the ennoblement of stainless steel is not due to indirect effects of H 2O 2 through the change of surface composition. The E corr ennoblement seems to be directly due to the presence of H 2O 2 and to the electrochemical behavior of H 2O 2 and related oxygen species. This consideration is important for understanding and controlling microbial influenced corrosion. The influence of glucose oxidase on the ennoblement of stainless steel is not due to indirect effects of H 2O 2 through the change of surface composition but to a direct electrochemical effect of H 2O 2.