Influence of deposition conditions on the microstructure of Al-based coatings for applications as corrosion and anti-permeation barrier
| Autor: | N. Holstein, Wolfgang Krauss, Sven-Erik Wulf, Jürgen Konys |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy chemistry.chemical_element Electrolyte Microstructure Corrosion Nuclear Energy and Engineering chemistry Aluminium Water cooling Deposition (phase transition) General Materials Science ddc:620 Electroplating Layer (electronics) Engineering & allied operations Civil and Structural Engineering |
| Zdroj: | Fusion Engineering and Design. 88:2530-2534 |
| ISSN: | 0920-3796 |
| DOI: | 10.1016/j.fusengdes.2013.05.060 |
| Popis: | Previous research revealed that the application of aluminum-based barriers is suitable to minimize corrosion rates of Eurofer steel in Pb–15.7Li and tritium-permeation from the liquid breeder into the cooling system (HCLL) in an envisaged future fusion reactor. Besides the former developed hot-dip-aluminization process (HDA), electrodeposition techniques based on water-free electrolytes, such as toluene-based electrolytes (ECA) and ionic liquids (ECX), showed promising results for the production of suitable aluminum layers. These processes allow electrodeposition of Al-layers on Eurofer steel with adjustable layer thicknesses, but a heat treatment procedure is needed afterwards to form the desired Fe–Al/Alumina scale. To investigate the deposition and treatment process in more detail, a new series of aluminum electroplating was performed by using the ECX process. The variation of deposition parameters (direct and pulsed current) showed clear impact on the morphology of deposited Al-layers. Heat treatments revealed that the formation of Fe–Al barriers is significantly influenced by the morphology of deposits, beyond other parameters like layer thickness. Presented metallographic and SEM/EDX analyses underline the occurred dependencies between deposition conditions and morphology and on the other hand Al-layer morphology and heat treatment behavior. |
| Databáze: | OpenAIRE |
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