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As reported in the last quarterly report, synthesis of Cr nanowires was found to be problematic in terms of uniform coverage. Hence Ni was identified as the alternative metal to form the nanowires. The purpose of the metal nanowires is to provide structural integrity to the nanoporous alumina, as well as a second defense mechanism against corrosion by oxidizing in case the top alumina layer is compromised. Nickel was selected due to its established electrochemical synthesis procedure. While Ni can provide very good structural integrity to the porous alumina, one potential problem is its higher dissolution rate in LBE. However, since the Ni layer will be protected by a thick layer of dense alumina on top, this is not expected to pose a major problem. After a detailed consideration, it was decided that Ni filling of the porous alumina structure can provide very valuable information about performance of the coating layers under thermal cycling. In parallel, process development for uniform deposition of Cr nanowires will also continue, which if successful, will be included in the final coating structure.


Aluminum oxide; Chromium; Corrosion and anti-corrosives; Eutectic alloys; Lead-bismuth alloys; Nanostructured materials; Nickel; Nuclear reactors — Materials — Testing; Protective coatings; Steel — Corrosion


Materials Science and Engineering | Metallurgy | Nanoscience and Nanotechnology | Nuclear Engineering | Oil, Gas, and Energy




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