Abstract
This study evaluates mechanisms of biogenic mineral formation induced by bacterial iron reduction for the stabilization of corroded iron. As an example, the Desulfitobacterium hafniense strain TCE1 was employed to treat corroded coupons presenting urban natural atmospheric corrosion, and spectroscopic investigations were performed on the samples’ cross-sections to evaluate the corrosion stratigraphy. The treated samples presented a protective continuous layer of iron phosphates (vivianite Fe2+3(PO4)2·8H2O and barbosalite Fe2+Fe3+2(PO4)2(OH)2), which covered 92% of the surface and was associated with a decrease in the thickness of the original corrosion layer. The results allow us to better understand the conversion of reactive corrosion products into stable biogenic minerals, as well as to identify important criteria for the design of a green alternative treatment for the stabilization of corroded iron.
Highlights
Cast iron and steel objects corrode rapidly when they are exposed outdoors, and complex layers composed of iron oxides and iron hydroxides are formed over time [1,2,3]
As part of our research topic, we investigated the potential of microbes for the stabilization of already corroded iron by converting part of the reactive corrosion layer into more stable biogenic minerals (Figure 1)
The results demonstrated that thatthis thisspecific specificmicrobial microbial process convert a part of the original corrosion demonstrated process diddid convert a part of the original corrosion layerlayer into into reduced iron compounds, as least within the
Summary
Cast iron and steel objects corrode rapidly when they are exposed outdoors, and complex layers composed of iron oxides and iron hydroxides are formed over time [1,2,3]. In the presence of moisture, these corrosion layers adsorb water and incorporate particulate matter and pollution agents from the atmosphere, which instigate further corrosion processes. In addition to iron oxides and iron hydroxides, iron sulfates are frequently reported compounds within an atmospheric corrosion layer, especially in polluted and urban areas [4,5]. Iron items exposed to such surroundings are susceptible to chloride-promoted corrosion, leading to chemical as well as mechanical damage to these objects [2,3,5].
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