Iron Sequestration by Galloyl–Silane Nano Coatings Inhibits Biofilm Formation of Sulfitobacter sp.

Abstract

Microbially-induced corrosion is the acceleration of corrosion induced by bacterial biofilms. The bacteria in the biofilms oxidize metals on the surface, especially evident with iron, to drive metabolic activity and reduce inorganic species such as nitrates and sulfates. Coatings that prevent the formation of these corrosion-inducing biofilms significantly increase the service life of submerged materials and significantly decrease maintenance costs. One species in particular, a member of the Roseobacter clade, Sulfitobacter sp., has demonstrated iron-dependent biofilm formation in marine environments. We have found that compounds that contain the galloyl moiety can prevent Sulfitobacter sp. biofilm formation by sequestering iron, thus making a surface unappealing for bacteria. Herein, we have fabricated surfaces with exposed galloyl groups to test the effectiveness of nutrient reduction in iron-rich media as a non-toxic method to reduce biofilm formation.

Progress of research on gallic acid in corrosion inhibition and rust removal protection of metals

“…These residues will not only seriously corrode industrial pipelines, but also pollute the soil and environment. In addition, the grinding of steel will also cause certain wear and tear on steel, which may lead to some steel not meeting the standard, resulting in certain safety hazards; the most important thing is that in the actual use of steel, there are often many dead corners that cannot be manually removed and the high cost of rust removal caused by location, steel size and other reasons (Messersmith et al , 2023). Coating without rust removal often causes poor adhesion and poor continuity of coatings 32.…”

“…The second method is the modifier method. This method uses gallic acid as a modifier to modify the synthesized organic resin coating to obtain a resin coating with better performance (Messersmith et al , 2023; Jia et al , 2016; Li et al , 2012). Gallic acid compounded organic resin coatings show increased adhesion to metal surfaces, helping to extend the life of metal structures.…”