| 摘要 |
The invention relates to opacified enamel frits which recrystallise during stoving to produce pale colours for single-layer (direct) enamelling on unpickled steel sheet, which frits consist of the following glass-forming components: … … 40-60% by weight of SiO2 + ZrO2 with a molar ratio of SiO2/ZrO2 > 10 … 10-20% by weight of alkali metal oxide with a molar ratio of Na2O/(Li2O + K2O) > 0.8 … 8-18% by weight of B2O3 … 0-15% by weight of CaO + BaO + MgO + ZnO … 0-8% by weight of TiO2 … 0-4% by weight of P2O5 … 0-4% by weight of Al2O3 … 0.3-5% by weight of fluorine in the form of fluorides … 0.2-3.5% by weight of NiO or CoO … 0-2% by weight of Sb2O3 … 0-2.5% by weight of CuO … and additionally contain MnO, Fe2O3 or other colouring components in proportions of up to 6% by weight and also 2.5-9% by weight of CeO2 which, by depositing CeO2 crystals during storing, lead to a significant opacifying of the enamelling without loss of other desired enamel properties, such as, for example, acid resistance and enamel adhesion. …<IMAGE>… |
