The action is by oxygen and water on a clean surface. It is our policy to passivate the SUS 316L and SUS 316LN austenitic SS tanks with 14% by volume cold Nitric acid. It is also our policy not to include hydrofluoric acid in a passivation solution. Hydro-flouric acid is a pickler which removes chromium and nickel along with heat hardened scale, it NOT a passivator. The concentrated acid you get on board in 200 litre drums is usually 68%. Contact time for Nitric acid is 2 hours.
Mineral salts can come in varieties. They are inorganic salts and include phosphate, calcium, chloride, sodium and potassium. One of the most common mineral salts is iodized salt. Iodine is essential to the function of the body as an iodine deficiency can be problematic.
Other examples of salts are Epsom salts (MgSO 4) used in bath salts, Ammonium Nitrate (NH 4 NO 3) used as a fertilizer and Baking Soda (NaHCO 3) used in cooking. The chemical formula of salt derives from the formula of constituent acid and base.any living bodies including human body also contains some kinds of acids and bases. A very common acid is the dilute Hydrochloric acid present in our stomach, which involves in the digestion process of food materials in stomach. Urine, blood, and intestinal fluid are alkaline in nature.