Hexagonal boron nitride for sulfur corrosion inhibition

Chilkoor, Govind, Jawaharraj, Kalimuthu, Vemuri, Bhuvan, Kutana, Alex, Tripathi, Manoj, Kota, Divya, Arif, Taib, Filleter, Tobin, Dalton, Alan B, Yakob, Boris I, Meyyappan, M, Rahman, Muhammad M, Ajayan, Pulickel M and Gadhamshetty, Venkataramana (2020) Hexagonal boron nitride for sulfur corrosion inhibition. ACS Nano. ISSN 1936-0851

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Corrosion by sulfur compounds is a long-standing challenge in many engineering applications. Specifically, designing a coating that protects metals from both abiotic and biotic forms of sulfur corrosion remains an elusive goal. Here we report that atomically thin layers (∼4) of hexagonal boron nitride (hBN) act as a protective coating to inhibit corrosion of the underlying copper (Cu) surfaces (∼6–7-fold lower corrosion than bare Cu) in abiotic (sulfuric acid and sodium sulfide) and biotic (sulfate-reducing bacteria medium) environments. The corrosion resistance of hBN is attributed to its outstanding barrier properties to the corrosive species in diverse environments of sulfur compounds. Increasing the number of atomic layers did not necessarily improve the corrosion protection mechanisms. Instead, multilayers of hBN were found to upregulate the adhesion genes in Desulfovibrio alaskensis G20 cells, promote cell adhesion and biofilm growth, and lower the protection against biogenic sulfide attack when compared to the few layers of hBN. Our findings confirm hBN as the thinnest coating to resist diverse forms of sulfur corrosion.

Item Type: Article
Keywords: two-dimensional, hexagonal boron nitride, copper, defects, microbial corrosion, density functional theory
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Manoj Tripathi
Date Deposited: 09 Nov 2020 10:05
Last Modified: 15 Apr 2021 12:06
URI: http://sro.sussex.ac.uk/id/eprint/94913

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