Hot Corrosion of an Electrodeposited Ni-11 wt % Cr Nanocomposite under Molten Na2SO4 – K2SO4 – NaCl
作者： C. Zhang , X. Peng , J. Zhao , F. Wang
DOI: 10.1149/1.1952667
关键词: Chromia 、 High-temperature corrosion 、 Chemical engineering 、 Metallurgy 、 Corrosion 、 Nanocomposite 、 Sulfidation 、 Grain boundary 、 Nanocrystalline material 、 Materials science 、 Nickel
摘要: A Ni-Cr nanocomposite with an average Cr concentration of 11 (wt %) was deposited onto nickel plate by simultaneous electrodeposition Ni and nanoparticles from a sulfate bath. The consisted nanocrystalline matrix dispersed mean size 33 nm. For comparison, two alloys, one similar content (10 wt the other much higher (20 %), were prepared using electro-arc melting. Hot corrosion testing under molten Na2SO4-K2SO4-NaCl in air at 700 degrees C showed that rapid formation continuous chromia-rich scale is essential for hot protection. This case only nanocomposite. Internal sulfidation observed arc-melted but not results demonstrate it primarily unique structure responsible its superior resistance. protection mechanism lies fast chromia on nanocomposite, due to easy nucleation both chromium abundant grain boundaries, then linking nuclei as result enhanced diffusion through those boundaries. (c) 2005 Electrochemical Society.
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