VERWENDUNG VON KOMPLEXBILDNERN ALS LYSIERUNGSMITTEL FUER GALACTITE

The invention concerns the use of complexing agents to dissolve calcium phosphate precipitates (galactite), characterized in that polymethylenecarboxylic acids, polymethylenephosphonic acids or alkali metal salts thereof are used as complexing agents which, in an aqueous solution containing 0.1-2 %...

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Bibliographic Details
Main Authors ROSSMAIER, HENRY., 4000 DUESSELDORF, DE, BLUM, HELMUT
Format Patent
LanguageGerman
Published 28.03.1991
Subjects
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
INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL
METALLURGY
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Summary:The invention concerns the use of complexing agents to dissolve calcium phosphate precipitates (galactite), characterized in that polymethylenecarboxylic acids, polymethylenephosphonic acids or alkali metal salts thereof are used as complexing agents which, in an aqueous solution containing 0.1-2 % by wt. of sodium hydroxide and 0.1-2 % by wt. of complexing agent, completely dissolve 100-500 mg of galactite in less than 15 min at a temperature of 40-80 DEG C.
Bibliography:Application Number: DE19893931007