PHOSPHORIC ACID :-. Phosphoric acid is soluble in water. It is incompatible with strong caustics and it is corrosive to ferrous metals and alloys.

PHOSPHATING CHEMICAL :- a chemical method of surface treatment in which a metallic surface reacts with an aqueous phosphate solution. This creates a hardly soluble conversion layer made of metal phosphates. For this purpose, the material is first cleaned with acid and then the phosphate layer is formed.

SULFAMIC  ACID:- It is used in cleaning metal and ceramics, dye manufacturing, for stabilizing Chlorine in swimming pools, in electroplating, and as a bleaching agent.