Low-temperature synthesis of a graphene-based, corrosion-inhibiting coating on an industrial grade alloy

Abstract

 Prepare a 7 nm thick graphene based coating on an Inconel 625 substrate  A low temperature, molecular polymerisation recipe prevents substrate degradation  Coating reduces corrosion current by two orders of magnitude in acidic conditionsThe use of graphene materials as protective coatings for metallic substrates has received much attention because of graphene's ability to seal a metal and prevent the diffusion of most corrosive species to the metal surface. The application of graphene-based coating technology to industrially relevant samples, however, is hindered by the high growth temperatures required to prepare functional and efficient protective graphene layers. The growth temperatures typical for popular catalysts and precursors are incompatible with most relevant alloys. Here, we present a lowtemperature synthesis route to a graphene-based coating, using a complex metallic alloy, Inconel 625, as an example substrate. We demonstrate that the coating reduces the sample corrosion current by two orders of magnitude and also shifts the open circuit potential from -308 mV to +129 mV. We present an extensive characterisation of the coating and the coating synthesis procedure. The procedure relies on a surface-activated, thermally-induced polymerisation reaction and the method should be transferable to other metallic alloys.

Nanotechnology in the service of corrosion science: considering graphene and derivatives as examples

“…These materials possess excellent dispersibility properties and distributed uniformly in the polymer matrix. In many reports, pure graphene is utilised in anticorrosive coating formulations, particularly for copper alloys in sodium chloride solutions [89][90][91][92][93][94][95][96][97][98][99][100][101]. However, to improve the dispersibility as well as corrosion inhibition performance, the chemically modified graphene derivatives are being used in the anticorrosive coating formulations.…”

Electrochemical Corrosion Behaviour of Nickel and Nickel-Reduced Graphene Oxide Coatings on Mild Steel in 3.5% NaCl Solution

“…Graphite oxide (GO) was prepared by the modified Hummers method [20]. In the typical synthesis, sulphuric acid (92 mL) was taken in a 500 ml conical flask, maintained at a low temperature by keeping it in an ice bath.…”

“…There are various synthetic methods for the preparation of reduced graphene oxide have been reported in the literature [14]. Among the available preparation methods, the low-temperature thermal exfoliation method is a good route to produce bulk few-layered reduced graphene oxide at a low cost [20,21]. To the best of the author's knowledge, there are few reports have been presented on corrosion resistance performance of nickel-reduced graphene oxide (Ni-rGO) coatings.…”

Study on the Corrosion and High‐Temperature‐Resistant Coating for In Situ Crosslinking Reaction Catalyzed by a Special “Egg Inlaid Egg Tray” Structure

“…[11,12] In order to improve the corrosion resistance of waterborne epoxy resin coatings, graphene oxide (GO) and chitosan (CS) were added to the coating. GO is a layered 2D material [13,14] with unique properties such as impermeability to small molecules, [15] antibacterial property, [16,17] and chemical modification, [18,19] which has great application potential in the field of anticorrosion coatings. For instance, modified by grafting and crosslinking, a large number of hydroxyl and carboxyl functional groups on the A new type of water corrosion-resistant coating which is similar to the "egg inlaid egg tray" structure is successfully prepared.…”