Failure of multi-layer graphene coatings in acidic media
| Autor: | Feng Yu, Peter Bøggild, Luca Camilli, Adam Carsten Stoot |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
General Chemical Engineering chemistry.chemical_element 02 engineering and technology Zinc Manganese engineering.material 010402 general chemistry 01 natural sciences law.invention Cathodic protection Coating Aluminium law Composite material Settore FIS/03 Graphene Metallurgy General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Nickel chemistry Catastrophic failure engineering 0210 nano-technology |
| Zdroj: | RSC Advances. 6:21497-21502 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c6ra01556e |
| Popis: | Being impermeable to all gases, graphene has been proposed as an effective ultrathin barrier film and protective coating. However, here it is shown how the gastight property of graphene-based coatings may indirectly lead to their catastrophic failure under certain conditions. When nickel coated with thick, high-quality chemical vapor deposited multilayered graphene is exposed to acidic solutions, a dramatic evolution of gas is observed at the coating–substrate interface. The gas bubbles grow and merge, eventually rupturing and delaminating the coating. This behavior, attributed to cathodic hydrogen evolution, can also occur spontaneously on a range of other technologically important metals and alloys based on iron, zinc, aluminum and manganese; this makes these findings relevant for practical applications of graphene-based coatings. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|