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OBSERVATIONS ON THE FUNCTION OF ADHERENCE‐PROMOTING OXIDES IN GROUND‐COAT ENAMELS *
Author(s) -
Kautz Karl
Publication year - 1939
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1939.tb19462.x
Subject(s) - enamel paint , iron oxide , oxide , materials science , metallurgy , penetration (warfare) , oxygen , cobalt , inorganic chemistry , chemistry , composite material , organic chemistry , operations research , engineering
A bstract Five enamels were smelted which contained ( a ) no adherence‐promoting oxides, ( b ) 0.5% Co 3 O 4 , ( c ) 0.5% NiO, ( d ) 1.0% MnO 2 , and ( e ) all three oxides. A study was made of the effect of these oxides in the enamel upon (1) the adherence to sheet iron, (2) the iron oxides formed between the enamel and iron base, and (3) the ability of the enamel to carry or transmit oxygen from the air to the iron base. The results obtained show that cobalt oxide promotes adherence, allows heavy films of iron oxide to form at the surface of the iron, and accelerates penetration of aerial oxygen through the molten enamel layer. Nickel oxide behaves like cobalt oxide, but it is much weaker. The results show that manganese oxide does not promote adherence, allows no iron‐oxide films to form, and has a slight effect only upon the penetration of aerial oxygen through the molten enamel layer.