Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 1565-1579 |
| Journal | Corrosion |
| Volume | 72 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2016 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- carbon steel
- deep biosphere
- electrochemical impedance spectroscopy
- groundwater
- microbiologically influenced corrosion
- nuclear waste
