Rust dissolution and removal by iron-reducing bacteria: A potential rehabilitation of rusted equipment

Tuning the pH‐responsiveness capability of poly(acrylic acid‐co‐itaconic acid)/NaOH hydrogel: Design, swelling, and rust removal evaluation

“…The highest hydrogel swelling was obtained at basic pH while the highest metal rust removal was produced at very acidic, indicating that the mechanism of rust removal is independent of the hydrogel swelling capability. The maximum iron rust removal was 269 mg g −1 of hydrogel (Table ), which is equivalent to 0.106 g cm −2 of the metal surface, this value is almost four times greater than the one reported in previous work (0.028 g cm −2 of the metal surface) . For copper rust removal, no information was found in the literature, which restricted the comparison of our results.…”

“…Corrosion of carbon steel and copper trigger various direct or indirect consequences; some of the most common issues are related with economic losses, environmental pollution (mostly associated with contamination of water sources) or in some extreme cases, death by accidents. Currently, the control strategies used to clean rusted equipment or pipelines is expensive, subject to environmental restrictions, and mostly inefficient . The most common method is pickling because it reduces treatment times as well as an operating cost, but it has the inconvenient of needing mechanical action, solvency, detergency, or chemical reactions .…”

“…Thus, several studies have been directed to develop green methods that overcome these obstacles. Examples are the bio‐methods that use iron‐oxidizing (IOB) or iron‐reducing bacteria (IRB), in these works, the removal of rust deposits from the corroded ferrous metal surface is achieved by immersing the metallic plates into a culture medium of IOB or IRB. In these methods, the iron rust layer is biologically dissolved, resulting in rust peel off through iron inter‐phase layer dissolution.…”

Corrosion of Q235 Carbon Steel in Seawater Containing Mariprofundus ferrooxydans and Thalassospira sp.

“…Additionally, corrosion of carbon steel was promoted due to that Fe 3+ produced from IOB metabolism can rapidly oxidize Fe 0 to Fe 2+ (Wang et al, 2014; Liu et al, 2016; Liu H. et al, 2018). The relationship of IRB to corrosion was not straightforward, i.e., IRB may enhance corrosion under some circumstances, or have a passivating effect on corrosion in others (Duan et al, 2008; Mehanna et al, 2008; Esnault et al, 2011; Schutz et al, 2014, 2015; Cote et al, 2015; Starosvetsky et al, 2016). Corrosion acceleration induced by IRB was mainly related to that the reduction of insoluble ferric compounds to soluble ferrous ion facilitated the removal of protective corrosion products on steel surface (Esnault et al, 2011; Starosvetsky et al, 2016), and bio-oxidation of H 2 resulted in high anodic dissolution rate of steel (Schutz et al, 2014, 2015).…”

“…The relationship of IRB to corrosion was not straightforward, i.e., IRB may enhance corrosion under some circumstances, or have a passivating effect on corrosion in others (Duan et al, 2008; Mehanna et al, 2008; Esnault et al, 2011; Schutz et al, 2014, 2015; Cote et al, 2015; Starosvetsky et al, 2016). Corrosion acceleration induced by IRB was mainly related to that the reduction of insoluble ferric compounds to soluble ferrous ion facilitated the removal of protective corrosion products on steel surface (Esnault et al, 2011; Starosvetsky et al, 2016), and bio-oxidation of H 2 resulted in high anodic dissolution rate of steel (Schutz et al, 2014, 2015). IRB induced corrosion-inhibition was always linked to a modification of the environmental conditions at the metal/solution interface by biological activity, i.e., formation of green rust or an iron (II) phosphate layer in biofilm contained IRB could prevent the corrosive agents from reaching steel surface (Duan et al, 2008; Cote et al, 2015).…”