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.
Trace Elements. Sea salt can also contain numerous trace elements. These elements exist in minute concentrations but work with other minerals to maintain optimal function in your body. Trace minerals you may find in sea salt include phosphorus, bromine, boron, zinc, iron, manganese, copper and silicon. Your body uses some of these minerals, such as iron and zinc, to make enzymes involved in metabolism.