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AssigneeFerro France - S.A.R.L.
InventorsAlain Aronica, Emmanuel Marinho, David Coutouly, Luc Allemeersch, Christophe Reb
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The present invention provides a composition for use in forming a white porcelain enamel coating on aluminized or galvanized steel. The composition according to the present invention includes a solids portion including a glass component and a white pigment. The glass component includes one or more glass frits including by weight from about 30% to 50% P2O5, from about 15% to about 30% Al2O3, from about 8% to about 40% X2O where X=Na and/or K, up to about 30% TiO2, up to about 12% B2O3, up to about 10% K2O, up to about 10% ZnO, up to about 8% SiO2, up to about 7% La2O3, up to about 5% Li2O, and up to about 15% F. The white pigment include TiO2. The present invention also provides a method of forming a white porcelain enamel coating on an aluminized or galvanized steel substrate that includes providing a steel substrate having an aluminized or galvanized surface, providing a composition for use in forming a white porcelain enamel coating as previously described, applying the composition to the aluminized or galvanized surface, and firing the composition to form a white porcelain enamel coating. And, the present invention also provides a section of aluminized or galvanized steel having a white porcelain enamel coating disposed thereon, with the white porcelain enamel coating exhibiting an acid resistance of AA or better according to ISO 2722, a class 1 bond adherence rating according to EN 12209, and an opacity of L≧94 according to the CIE L*a*b* uniform color space, where L*=116 (Y/Y0)½−16 for Y/Y0) 0.008856.
A composition for use in forming a white porcelain enamel coating on aluminized or galvanized steel, said composition comprising a solids portion comprising a glass component and a white pigment, said glass component comprising one or more glass frits comprising by weight from about 30.6% to 45.9% P2O5, from about 19.1% to about 28.7% Al2O3, from about 13.9% to about 20.8% Na2O, from about 4.1% to about 6.1% B2O3, from about 3.4% to about 5.1% K2O, from about 2.3% to about 3.4% ZnO, from about 1.8% to about 2.7% SiO2, from about 1.0% to about 1.5% Li2O, and from about 4.5% to about 6.8% F, and said white pigment comprising TiO2.
Dependencies are inferred from the claim text.