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51313-02675-Biocorrosion of AISI 1020 Carbon Steel Protected With the Base Coat of Niobium Oxide

Product Number: 51313-02675-SG
ISBN: 02675 2013 CP
Author: Márcia Lutterbach
Publication Date: 2013
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The evaluation of the action of micro-organisms which usually occurs in association with chemical processes it is essential to estimate the lifetime of a given material or set a prevention mode to control spoilage. The application of coatings has been a method used to prevent or control corrosion induced by microorganisms (MIC) mainly carbon steel a metal often used in various industries at low cost but less corrosion resistant. This study aimed at evaluating comparatively the colonization and MIC of carbon steel AISI 1020 with and without a base coat of niobium oxide in sea water (Guanabara Bay). The components of the coating – niobium oxide epoxy and paint – presented toxic effects on the plankton populations of aerobic heterotrophic bacteria sulface reducing bacteria (SRB) and iron precipitating bacteria while anaerobic heterotrophic bacteria were not susceptible. After seven days of exposure except for SBR it was evidenced a greater number of bacterial populations in biofilms formed on the metal surface compared to the uncoated one. At this time the concentration of sessile population was dependent on their concentration in the planktonic phase. At the end of monitoring period (35 days) the SRB concentration in biofilms on coated coupons had lowered 5 orders of magnitude. The electron scanning microscopy (SEM) results revealed the occurrence of bacteria in the form of rods attached to the coated carbon steel. A uniform and located corrosion was observed on uncoated coupons exposed to sea water (fresh and sterile) especifically more intense in fresh seawater. However the coated coupons showed no blistering or rusting evidence in the total period. The electrochemical tests showed the influence of bacteria on the current and corrosion potential of carbon steel although few changes were detected when the metal was painted showing the effectiveness of the niobium oxide coating on the protection of carbon steel.

The evaluation of the action of micro-organisms which usually occurs in association with chemical processes it is essential to estimate the lifetime of a given material or set a prevention mode to control spoilage. The application of coatings has been a method used to prevent or control corrosion induced by microorganisms (MIC) mainly carbon steel a metal often used in various industries at low cost but less corrosion resistant. This study aimed at evaluating comparatively the colonization and MIC of carbon steel AISI 1020 with and without a base coat of niobium oxide in sea water (Guanabara Bay). The components of the coating – niobium oxide epoxy and paint – presented toxic effects on the plankton populations of aerobic heterotrophic bacteria sulface reducing bacteria (SRB) and iron precipitating bacteria while anaerobic heterotrophic bacteria were not susceptible. After seven days of exposure except for SBR it was evidenced a greater number of bacterial populations in biofilms formed on the metal surface compared to the uncoated one. At this time the concentration of sessile population was dependent on their concentration in the planktonic phase. At the end of monitoring period (35 days) the SRB concentration in biofilms on coated coupons had lowered 5 orders of magnitude. The electron scanning microscopy (SEM) results revealed the occurrence of bacteria in the form of rods attached to the coated carbon steel. A uniform and located corrosion was observed on uncoated coupons exposed to sea water (fresh and sterile) especifically more intense in fresh seawater. However the coated coupons showed no blistering or rusting evidence in the total period. The electrochemical tests showed the influence of bacteria on the current and corrosion potential of carbon steel although few changes were detected when the metal was painted showing the effectiveness of the niobium oxide coating on the protection of carbon steel.

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