What is the typical procedure for chemical removal of corrosion on iron and steel?

• A. Generally, a phosphoric acid/water mixture is used to chemically remove corrosion from iron and steel. On completion of the 'dwell time' (2-10 minutes), the solution is thoroughly rinsed off, the item immediately dried with a clean lint free cloth and then painted
• B. A sodium hydroxide solution is used to remove corrosion, followed by rinse and dry.
• C. Hydrochloric acid is applied in a single rinse.
• D. Mechanical brushing only is used.

Answer: (A)