Glazing of Al Frit on Aluminized Steel Plates

概要

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The object of this examination was to find the possibility that the phosphate frit melting at a low temperature might be glazed on the aluminized steel plates. Tests were made especially on the pre-treatment of aluminized steel plates, adjustment of expansion coefficients, and adherence of the frit.1) It was made clear that the sodium perborate method (T. Yamada and S. Tomino, J. Ceram. Assoc. Japan, 67 (1) 88 (1959)) was as excellent for the surface treatment of aluminized steel plates as for the pre-treatment of aluminized plates in aluminum enamelling.2) When it was glazed on the steel plate, the frit was cracked on the surface. It was clear that it arose from the fact that the expansion coefficient of the frit was larger than that of the aluminized steel plate. Adjustment of this coefficient was effected by adding bentonite, TiO2, SnO2, and Al2O3. Optimum amount of addition was 0.1% bentonite, over 1% TiO2, 0.5-1% SnO2, or 2-3% Al2O3 respectively.3) Good adherence of the adjusted frit to the aluminized steel plate was ascertained by the bending test.
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