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This project aims to assess the performance of typical stainless steels and newer stainless steel grades with enhanced corrosion resistance and to define tools to prevent microbiologically influenced corrosion (MIC) failures, including recommendations and procedures for usage of stainless steels. Targeted MIC laboratory experiments were performed in contaminated waters to study the effect on the selected stainless steels. Following these experiments, accelerated MIC test methodologies, sensors and instrumentation were designed. Test procedures were validated in a large-scale device by using the selected techniques for MIC monitoring, including corrosion potential, redox potential and electrochemical impedance spectroscopy measurements. The results confirmed the results obtained during the laboratory measurements: in experimental conditions, the biofilm grown in the presence of sulphate reducing bacteria (SRB) did not alter the properties of the stainless steel passive films. In the presence of manganese bacteria, a potential ennoblement was observed for the stainless steels examined and the risk of getting an attack is dependent on the PRE value of the steel. The MIC field experiments were carried out in CSM's water treatment plant in Italy. The corrosion process in the water plant was the result of the synergistic action of manganese oxidising bacteria and sulphate reducing bacteria. New counter measures to avoid stainless steel MIC failures in water systems were defined, including environmentally friendly inhibitors and anodic and cathodic protection. The new natural inhibitors can be applied successfully against MIC in aqueous systems. Cathodic and anodic systems were suitable for controlling MIC in the presence of manganese bacteria.

Additional information

Authors: DE CRISTOFARO N, Centro Sviluppo Materiali (CSM), Roma (IT);MENGARONI E, Centro Sviluppo Materiali (CSM), Roma (IT);TELEGDI J, CRC - HAS, Budapest (HU);ARLT N, ThyssenKrupp Nirosta, Düsseldorf (DE);GÜMPEL P, Hochschule Konstanz Technik, Wirtschaft und Gestaltung, Konstanz (DE);SCHILLER D, Hochschule Konstanz Technik, Wirtschaft und Gestaltung, Konstanz (DE);MATRESS SERANO V, Acerinox, Los Barrios (ES);MOURA E SILVA T, Instituto Superior Técnico, Lison (PT);FERREIRA M, Instituto Superior Técnico, Lison (PT)
Bibliographic Reference: EUR 22819 EN (2007), 147 pp. Euro: 25
Availability: (Catalogue Number: KI-NA-22819-EN-S)
ISBN: ISBN: 978-92-79-05374-0
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