SIPS 2018

DETAILLED PROGRAM OVERVIEW

Ultra-thin Graphene Coating on Metals for Corrosion Resistance: Opportunities and Challenges
Raman Singh¹;
¹MONASH UNIVERSITY, Monash University, Australia;
PAPER: 168/Composite/Plenary (Oral)
SCHEDULED: 14:00/Mon./Grego (50/3rd)

ABSTRACT:
Corrosion of engineering alloys and its mitigation measures cost any developed economy ~4% of their GDP (i.e., ~$8b annually to Australia and ~$250b to USA). Traditional measures such as development of corrosion-resistant alloys and conventional coatings have not always provided durable corrosion resistance, particularly in highly demanding situations. Thus, a novel and disruptive approach is immensely commercially attractive. This presentation will discuss graphene coating as a disruptive approach to durable corrosion resistance [1-2], chronological evolution of the field, and success in circumventing the related challenges. The presenter's group demonstrated that just 1-2 atomic layers of graphene coating can improve corrosion resistance of copper (Cu) by two orders of magnitude in an aggressive chloride solution (similar to seawater) [2]. However, the improvement in corrosion resistance of Cu due to graphene coating vary remarkably in different studies, i.e., from >2 orders of magnitude [2], to only 10 times [3] to little improvement [4]. In fact, a few subsequent studies [5,6] have categorically demonstrated graphene coated Cu to show remarkably inferior long-term oxidation resistance to bare Cu. The presenter's recent investigations [7,8] have provided mechanistic understanding of such variabilities. The group also had considerable success in circumventing the factors/challenges that contributed to the development of deleterious defects in graphene film that trigger accelerated corrosion (instead of protection) as reported in other studies [5,6]. The graphene developed the most recent studies [7,8] have been demonstrated to provided durable corrosion resistance to nickel [7] (see Figure 1) and copper [8]. However, developing graphene on most common engineering alloys (e.g., mild steel) by CVD poses a few fundamental scientific challenges that this presentation will discuss.

References:
[1] Chen, L et.al., Oxidation Resistance of Graphene-Coated Cu and Cu/Ni Alloy, ACS Nano, 5 (2011) 1321.
[2] RK Singh Raman et.al., Protecting Copper from Electrochemical Degradation by Graphene Coating, Carbon, 50 (2012) 4040.
[3] D Prasai et.al., Graphene: Corrosion-Inhibiting Coating, ACS Nano, 6 (2012) 1102.
[4] N Kirkland et.a., Exploring graphene as a corrosion protection barrier, Corros Sci, 56 (2012) 1. S
[5] M Schriver et.al., Graphene as a Long-Term Metal Oxidation Barrier: Worse Than Nothing, ACS Nano, 2013, 10.1021/nn4014356.
[6] F Zhou et al, Enhanced Room-Temperature Corrosion of Copper in the Presence of Graphene, ACS Nano, 7 (2013) 6939
[7] MR Anisur, RK Singh Raman, Controlling Hydrogen Environment and Cooling during CVD Graphene Growth on Nickel for Improved Corrosion Resistance, Carbon, 127 (2018) 131.
[8] A Tiwari, RK Singh Raman, Durability of Corrosion Resistance of Copper due to Ultra-thin Surface Layers of Graphene, Materials, 10 (2017) 1112.