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According to the report of the American Physicist Organizations Network on February 22, scientists discovered that the magic material, graphene, is truly a "faceless, distressed baby." In addition to being the hardest material known so far, it is still the thinnest coating currently available and can be protected. Copper, nickel and other metals are not corroded. The most recent study was published in the American Chemical Society's journal ACS Nano.
In the latest study, Diraj Parasai and colleagues pointed out that metal rust and corrosion is a very serious global problem, and scientists are looking for ways to slow or prevent rust or corrosion. Corrosion of metal-derived surfaces comes into contact with air, water, or other substances. Currently, the commonly used corrosion protection method is to wrap metal with certain materials to hide the surface, but these wrapping materials have their own limitations.
Graphene has a thickness of only one carbon atom and is currently the thinnest material in the world. The scientists found that within the graphene, the carbon atoms are arranged like a fine wire mesh fence. The layer is so thin that it looks transparent, and an ounce (28.350 g) of graphene is enough to cover 28 footballs. field.
Recent studies have found that whether the graphene is placed directly on the surface of copper or nickel or transferred to other metal surfaces by other methods, the metal can be protected from corrosion. In the experiment, they allowed monolayer graphene to grow on copper by chemical vapor deposition (CVD) to envelop copper. The results showed that the corrosion rate was 7 times slower than that of bare copper; it was made by letting multilayer graphene grow on nickel. Thus enveloping nickel, the corrosion rate is more than 20 times slower than bare nickel. In addition, surprisingly, single-layer graphene has the same corrosion resistance as conventional organic coatings, but the organic coating is five times thicker than graphene.
The scientists said that the graphene coating may be an ideal anti-corrosion coating and can be used in many applications, especially in areas where thin coatings are required, such as for packaging of connection equipment and aerospace equipment and for use in transplant equipment. Microelectronic components. (Liu Xia)
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