Pickling is a critical process in cold-rolled coil production, primarily serving to remove scale (FeO, Fe₂O₃, Fe₃O₄) from the surface of hot-rolled coils. This scale impairs contact between rollers and steel sheets during cold rolling, increasing rolling forces, causing surface scratches, and potentially damaging equipment. Acid pickling yields a clean, uniform surface, creating optimal conditions for subsequent cold rolling. Common pickling solutions include hydrochloric acid and sulphuric acid. During pickling, acid concentration, temperature, and duration must be strictly controlled to ensure complete removal of scale without excessive corrosion of the base metal. Post-pickling rinsing and drying are essential to prevent residual acid from corroding the steel sheet. Pickling quality directly impacts the surface finish and formability of cold-rolled coils.
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