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US 2013/0074871 A1Published application
Stainless steel pickling in an oxidizing, electrolytic acid bath
AssigneeAK Steel Properties, Inc.
InventorsAmanda R. Glass, Ronald D. Rodabaugh, David M. Price
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Abstract
A pickling process designed for pickling a metal strip such as a stainless steel strip reduces the amount of HF and/or HNO3. The strip is immersed in at least one first pickling tub that contains a mixture of an acid such as H2SO4, an excess of at least one oxidizing agent, and includes electrodes that may apply a current to the strip that runs through the mixture.
Claims26
A process for pickling a strip of ferritic stainless steel comprising:
- treating the steel with a first mixture disposed in a first tub, the first mixture comprising H2SO4, an excess of at least one oxidizing agent, and
- applying a current to the steel, wherein the first mixture does not include HF.
A process for pickling a continuous strip of stainless steel comprising:
- treating the steel with a first mixture disposed in a first tub, the first mixture comprising H2SO4, an excess of at least one oxidizing agent, and
- applying a current to the steel, wherein the concentration of H2SO4 is from about 10 g/L to about 200 g/L.
Dependencies are inferred from the claim text.