Abstract
Commercial aluminum foils were coated by graphene oxide, and its functionalized derivatives and the corrosion performance of the coated specimens were examined in acidic conditions (lithium perchlorate and sulfuric acid). Electrochemical experiments have shown that all graphene oxide-coated specimens provided up to 96% corrosion inhibition efficiency with a corresponding lower corrosion rate compared to the bare aluminum foil. Our results clearly show that graphene-related materials offer viable alternatives for the protection of aluminum, and this opens up a number of possibilities for its use in a number of commercial applications.
Highlights
One of the major challenges of the modern world is to find a way to inhibit the process of metal corrosion, a problem that is triggered by environmental factors such as the presence of oxygen [1], water [2], ultraviolet (UV) [3] and electrolytes [4]
According to the results shown in the subsequent sections, the functionalized graphene oxide (GO) provided a corrosion inhibition efficiency of up to 90% in aggressive environments such as lithium perchlorate (LiClO4 – 1M), which simulates the conditions of Lithium-ion batteries (LIBs), and sulfuric acid (H2SO4 – 0.5M)
GO, reduced graphene oxide (rGO), and functionalized GOs were coated on Al foils to study the degree of corrosion they can provide in aqueous (0.5 M H2SO4) and non-aqueous (1 M LiClO4) corrosive environments
Summary
One of the major challenges of the modern world is to find a way to inhibit the process of metal corrosion, a problem that is triggered by environmental factors such as the presence of oxygen [1], water [2], ultraviolet (UV) [3] and electrolytes [4]. Electrophoretic deposition (EPD) is currently the most common technique applied for coating metals using graphene derivatives, such as GO and rGO [30,31,32] since it has the ability to form a relatively dense and homogeneous packed layer on any electrically conductive surface [33]. It was found by tailoring graphene coating in tandem with EPD, the corrosion rate of Cu was reduced by 10 times [34]. By comparing their performance with the commercial GRMs coated specimens, it is found that the latter is inferior in the level of coverage and uniformity and in the degree of corrosion protection, indicating that the corresponding market is filled with products of questionable quality and performance that need to be evaluated
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