Method for maintenance of used permanent cathode plates
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United States of America Patent
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Jul 18, 2017
Grant Date -
Oct 27, 2016
app pub date -
Dec 16, 2014
filing date -
Dec 18, 2013
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Abstract
A method for maintenance of used permanent cathode plates, said used cathode plate having scratches, crud formations and oversize grain boundaries on a surface of the cathode plate. The method comprises removing of scratches and accumulated crud from the surface of the cathode plate. The method further comprises removing substantially completely the oversize grain boundaries from the surface, and thereafter regenerating the grain boundaries of the surface of the cathode plate to an average grain boundary width of 1 to 3 μm and an average grain boundary depth less than 1 μm.
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