What is it about?
In this paper, the effect of surface oxidation on corrosion behavior of Co-20.8Ni-6Al-10Cu-11Fe alloy in molten cryolite is investigated.
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Why is it important?
The primary extraction of aluminum is carried out by the so-called Hall-Heroult electrolysis method. This method works by utilizing the graphite anodes. These anodes were consumed during electrolysis and produce a lot of greenhouse gas. Thereof the aluminium industries want to replace the other types of anode materials which have longer lifetime and produce no types of greenhouse gases or other emissions.
Perspectives
The major factor that influence on the selection of the candidate materials for inert anodes, is their corrosion resistance against Hall-Heroult molten bath. It is noted that Ni-Cu-Fe alloys are suitable for this application. Also it is reported that the anode surface should covered by a protective oxide layer. It is also reported that this oxide layer might create by oxidation of samples or coating on the surface of the samples by the other coating process. But the simplest method is oxidation of the samples in the oxide environment at elevated temperatures.
Mr reza tamasgavabari
Read the Original
This page is a summary of: Effect of surface oxidation on corrosion mechanism of Co–20·8Ni–6Al–10Cu–11Fe cobalt alloy in molten cryolite, Corrosion Engineering Science and Technology The International Journal of Corrosion Processes and Corrosion Control, February 2014, Taylor & Francis,
DOI: 10.1179/1743278214y.0000000149.
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