Protective coatings for the carrier bars of pre-baked anodes and the emerging part of the anodes
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United States of America Patent
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Aug 7, 1990
Issued Date -
N/A
app pub date -
Oct 25, 1989
filing date -
Nov 14, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A coating composition is disclosed for protecting from corrosion and oxidation in the hot condition carrier bars of pre-baked anodes and the emergent carbonaceous part of the anodes for the protection of aluminum in the Hall-Heroult process. The composition consists essentially of dry matter formed by calcium alumnate cement having an alumina content of at least 70% and a low content of impurities, magnesium spinel, and optionally, further alumina, together with water in the amount of 10 to 80% by weight of the total dry matter.
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