P3 HO4
H3 PO4
O3 HP4
P4 HO3
Convert to steel surface area
Plating on surface
Coating on surface
Masking of surface
Phosphoric acid solution
Hydrofloric acid solution
Hydrochloric solution
Chromic acid solution
Dyeing
Painting
Phosphating
Dipping
200 Degree Centigrade
100 Degree Centigrade
400 Degree Centigrade
300 Degree Centigrade