Method for pickling metallic surfaces

Details Method for pickling metallic surfaces Method for pickling metallic surfaces

1984-04-24

1986-02-25

Hruskoci, Peter

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 41, 148 615R, 252146, 252151, C23G 102

Patent

active

045727430

ABSTRACT:
A method for removing rust and/or scale from a metal surface, comprising contacting said metal surface with a homogeneous pickling solution comprising a major amount of a halogenated hydrocarbon solvent, an effective solubilizing amount of at least one alcohol solubilizer, an effective pickling amount of an aqueous phosphoric acid and preferably a mixture of phosphoric and sulfuric acids as pickling agent, and an effective inhibiting amount of at least one inhibitor for protecting the bare metal surface; wherein said contacting is effected at a temperature from room temperature up to the boiling point of said pickling solution; and wherein said contacting is continued for a time sufficient to substantially remove said rust and/or scale. This pickling system is advantageously used to prepare metals for phosphating in halocarbon-based phosphating baths.

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"Die Phosphatierung von Metallen", von Dr. Werner Rausch Chemische Werke Hols Aktiengesellschaft, E. G. Leuze Publishers, Saulgau (1974) pp. 25-41.

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