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

Susanne Halkjær, Jon Iversen, Line Kyhl, Jacques Chevallier, Federico Andreatta, Feng Yu, Adam Stoot, Luca Camilli, Peter Bøggild, Liv Hornekær, Andrew M. Cassidy*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The 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 low-temperature 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.

Original languageEnglish
JournalCorrosion science
Volume152
Pages (from-to)1-9
Number of pages9
ISSN0010-938X
DOIs
Publication statusPublished - 2019

Keywords

  • Acid corrosion
  • Acid inhibitions
  • AES
  • Alloy
  • Interfaces
  • Intergranular corrosion
  • Raman spectroscopy
  • SEM
  • Superalloys
  • XPS

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