Preparation of metal surfaces for enameling

A pickled steel sheet is treated with a solution containing alkanolamines with at least 3 alkanol groups, and an alkali before enamelling. In an example (parts and percentages by weight) a steel sheet that has been pickled in HCl with a content of 6% of ferrochloride is rinsed and then immersed at r...

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Bibliographische Detailangaben
Hauptverfasser:	DROSDZIOK HERMANN, ZIEHR GEORG
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY
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Beschreibung
Zusammenfassung:	A pickled steel sheet is treated with a solution containing alkanolamines with at least 3 alkanol groups, and an alkali before enamelling. In an example (parts and percentages by weight) a steel sheet that has been pickled in HCl with a content of 6% of ferrochloride is rinsed and then immersed at room temperature in a solution containing 2% of a mixture of 40 parts of caustic soda, 40 parts of triethanolamine and 20 parts of tetrasodium E.D.T.A. The sheet is finally rinsed and then passivated in a 1% solution of 60 parts soda, and 40 parts of trisodium phosphate. Borax may also be used in the passivating solution. Other alkanolamines that may be used are triisopropanolamine, and polyalkanol.