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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2016.tde-24022016-114730
Document
Author
Full name
Leandro Jorge da Silva
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2015
Supervisor
Committee
Schneider, Rene Peter (President)
Gomez, José Gregorio Cabrera
Melo, Hercilio Gomes de
Sato, Maria Inês Zanoli
Silva, Luiziana Ferreira da
Title in Portuguese
Corrosão microbiologicamente influenciada em superfícies metálicas expostas à água de processo industrial de usinas hidrelétricas.
Keywords in Portuguese
Biofilmes
Biofouling
Corpos de Prova
Corrosão Microbiológica
Taxas de Corrosão
Usinas Hidrelétricas
Abstract in Portuguese
Materiais metálicos expostos a ambientes aquáticos estão susceptíveis ao desenvolvimento de Corrosão Microbiologicamente Influenciada (CMI). Nas indústrias a CMI é um assunto de extrema importância devido aos prejuízos gerados nos reparos ou trocas de equipamentos e nas interrupções dos sistemas de produção associadas às falhas técnicas. No presente trabalho estão apresentados resultados de um estudo de CMI em superfícies metálicas expostas à água de processo em uma unidade geradora de energia hidrelétrica, que sofre com um acelerado processo corrosivo, principalmente nos trocadores de calor e nas turbinas. A partir de biofilmes de corrosão amostrados nas turbinas e trocadores de calor foram isolados grupos bacterianos redutores de sulfato e oxidantes e redutores de ferro que foram relacionadas como indutoras/ agravantes do processo corrosivo.
Title in English
Biocorrosion on metal surfaces in hydroelectric power plant.
Keywords in English
Biofilms
Biofouling
Corrosion Rates
Coupons
Hydroelectric Power Plants
Microbial Corrosion
Abstract in English
Metallic materials exposed to aquatic environments are susceptible to development of Microbiologically Influenced Corrosion (MIC). In industries MIC is a matter of great importance due to damages generated in repairs or equipment changes and production systems disruptions associated with technical failures. In this work are presented results of a MIC study on metal surfaces exposed to process water in a generating unit of hydropower, which suffers from an accelerated corrosion process, especially in the heat exchangers and the turbines. From corrosion biofilms sampled in turbines and heat exchangers were isolated bacterial groups sulfate reducing and oxidizing and reducing iron. These bacteria have been widely reported in the literature as inducing / aggravating the corrosion process.
 
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Publishing Date
2016-03-15
 
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