Corrosion and fouling protection of biocide-embedded hybrid coatings

A research work assesses the anticorrosion and antifouling properties of a novel sol-gel derived hybrid coating functionalised with five different organic and inorganic biocides on mild steel.

Corrosion and fouling protection performance of biocide-embedded hybrid organosiloxane coatings. Source: Pixabay -

FTIR and NMR analysis of the synthesised polymeric base material confirmed the photo-induced organic polymerisation of the allyl groups in the allyltrimethoxysilane precursor of the polymer and the inertness of the allyl groups in the allyl glycidyl ether precursor.

Interesting activities in saline

The parent coating and biocide-embedded coatings were applied on mild steel sheets, cured with UV light, and subjected to thermal, morphological and electrochemical characterisation. The cured coatings were thermally stable, and their hydrophobicity increased after immersion in a saline medium, owing to further polymer crosslinking. According to lab-based electrochemical and visual evaluations of the corrosion protection performance of the different formulations, the coating embedded with “Irgarol” and “Moly-white 101” had an improved performance, compared with the formulations with the other added biocides. Field testing results from the coated samples were consistent with the lab results; i.e., some biocides positively affected the anticorrosion and antifouling behaviour of the hybrid coatings, whereas other biocides negatively affected the developed hybrid coating. The methodology holds promise for the development of multifunctional hybrid sol-gel coatings for mild steel substrates with interesting anticorrosion and antifouling activities in saline.

The study is published in: Surface and Coatings Technology, Volume 324, 15 September 2017, Pages 526-535

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