Pickling acid

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1) Any acid bath used industrially to remove scale and oxides from the surface of metals prior to plating or finishing. The most common pickling bath for iron and steel is composed of a 10-20% sulfuric acid solution. Brass is bright cleaned with a mixture of sulfuric acid and nitric acid. The red cuprous oxide stains on copper and copper alloys are removed with a sulfuric acid solution mixed with sodium dichromate. Aluminum can be cleaned with a Framanol solution that contains chromium phosphate and triethanolamine. Acid baths work by chemical reaction of the acid with the surface of the metal.

2) An acid bath used to preserve or prepare a hides for tanning. Pickling acid usually contains 6-12 % dissolved salts in an acid solution with a pH below 2.5.

Synonyms and Related Terms

pickle solution; Framanol

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 606