pickling of iron which change
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Answer:
The reaction involving the scale (iron oxide) and hydrochloric acid proceeds more quickly if pure iron (Fe) is in contact with the acid. Cracks made in the scale layer during the scale breaking stage allow the iron in the steel strip to come into contact with the acid and pickling becomes easier. ... Faster pickling rates.
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Explanation:
Pickling is a very similar process to passivation. Pickling is the removal of any high temperature scale and the low chromium layer of the steel surface by a chemical treatment such as nitric or hydrofluoric acids. Because pickling involves a removal of metal layers, it can sometimes cause a change in appearance.
Pickling is a metal surface treatment used to remove impurities, such as stains, inorganic contaminants, rust or scale from ferrous metals, copper, precious metals and aluminum alloys. A solution called pickle liquor, which usually contains acid, is used to remove the surface impurities.