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A PECULIARITY OF SHEET‐IRON ACID RESISTING COVER COAT ENAMELS *
Author(s) -
Ebright H. E.,
Hansen J. E.
Publication year - 1933
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.1151-2916.1933.tb19259.x
Subject(s) - enamel paint , coat , materials science , layer (electronics) , composite material
It has been demonstrated that the small bare spots evident in the first coat of acid‐resisting enamel applied directly upon the ground coat are not necessarily the result of a process fish scaling in the ground coat during the firing operation, but are more often the result of reboiling of the ground‐coat enamel and lack of film strength in the yet unfused layer of acid‐resisting enamel. Reboiling, or other mechanical movements of the ground coat, may promote defects in acid‐resisting enamels which would not be visible in those of the nonacid‐resisting type, particularly when these enamels are applied directly upon the ground coat. The electrolytes used with acid‐resisting enamels are directly connected with the popping condition noted. A choice of the proper kinds and amounts of electrolytes for “setting‐up” the enamel can, in some cases, eliminate or minimize this trouble. The use of a nonacid‐resisting enamel, properly set up as an intermediate layer between the ground coat and the finish coat of acid‐resisting enamel, will also prevent troubles of this kind. The tendency for this peculiar defect to occur depends also upon the type of enameling base metal used and its tendency to reboil.