Method for pickling iron and steel surfaces

Details Method for pickling iron and steel surfaces Method for pickling iron and steel surfaces

1990-10-16

1992-04-28

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

134 3, 134 41, 252 794, B44C 122, C23F 100

Patent

active

051085445

ABSTRACT:
A method for pickling and/or etching iron and steel surfaces, in which the surfaces are treated in a pickling bath which contains inhibitors, mineral acids and metal salts of the anions of the acids. The inhibitor used is a mixture of tensides, silicates, phosphates and possibly oils, and the surfaces are preferably coated with inhibitor prior to being treated in the pickling bath. The surfaces are preferably first degreased with an aqueous tenside solution, therewith to emulsify hydrocarbons, such as grease and oils. Growth of microoganisms is stimulated for biological degradation of the hydrocarbons, by adding nutrient substances, whereafter the surfaces are treated in the pickling bath without intermediate rinsing.

REFERENCES:
patent: 2959494 (1960-11-01), Shepard
patent: 4460479 (1984-07-01), Mulder
patent: 4873014 (1989-10-01), Long
Chemical Abstracts, vol. 89, No. 8, 1978.
Chemical Abstracts, vol. 83, No. 14, 1975.
Chemical Abstracts, vol. 97, No. 8, 1982.

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