2016/07/19 by Pauliina Rajala, Leena Carpén, Mikko Vepsäläinen +4
Earth and Planetary Sciences · Engineering · Materials Science · #Building materials and conservation #Concrete Corrosion and Durability #Corrosion Behavior and Inhibition
paper · doi:10.5006/2118
crossref issued 2016/07/19 · crossref published 2016/07/19 · crossref published-online 2016/07/19 · openalex publication_date 2016/07/19 · crossref created 2016/07/20 · crossref published-print 2016/12/01 · crossref deposited 2025/03/18 · openalex created_date 2025/10/10 · crossref indexed 2026/07/29 · openalex updated_date 2026/07/30
Microbiologically influenced corrosion of carbon steel was assessed in a laboratory environment simulating the deep geological repository of radioactive waste. A dense and diverse biofilm was formed on the surfaces of steel in biotic systems without concrete. Addition of nutrients favored biofilm formation and altered the bacterial community; most distinctly, the relative abundance of Alphaproteobacteria decreased, and Deltaproteobacteria or Betaproteobacteria became more abundant, when nutrients were available. Nutrient amendment also increased the corrosion rate and changed the composition and resistance of corrosion products (mostly FeS, Fe2O3, or Fe(OH)2). Presence of concrete inhibited the corrosion of steel and hindered the biofilm formation on steel. Only sparse biofilm consisting of known alkaliphilic bacteria was detected. In the presence of concrete, the corrosion rate was consistently radically decreased, as the properties of the surface deposits (mostly CaCO3) were different from those in the other systems.