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.
Salts are ionic compounds composed of cations and anions in appropriate proportions to produce electrically neutral species. Salts are named by cation species first followed by anion species. Examples of common salts include sodium chloride, sodium bisulfate, calcium chloride and potassium dichromate.ydrated salts are salt compounds that include water molecules in their crystal structure. Many salts are found in hydrated form and maintain a solid crystalline state. The hydration of salt crystals is known as the water of crystallization, where water is often required for the crystal formation of the salt.