Resorcinol Silicates Sodium Methylate Sodium Sulfate Products Solvents Sulfur Monochloride Sodium chromate is used for inhibiting metal corrosion, pigment formulation and oil well drilling. Sodium chromate is used in certain types of corrosion control applications, as well as in the formulation of pigments, where alkalinity is required. It is an alternative to sodium bichromate in these cases.
Sodium chromate is available in anhydrous crystalline form.
Since sodium chromate is hygroscopic, the anhydrous form is better suited for areas where high humidity could cause caking and handling problems. Chromate solutions in water are slightly alkaline, whereas sodium bichromate solutions are acidic. Thus, circulating water cooling systems can use sodium chromate without the addition of caustic soda to create an alkaline condition. Applications Sodium chromate is sufficiently soluble to inhibit corrosion when used in coolants containing methyl, ethyl, or isopropyl alcohol. Sodium chromate finds its primary application as a corrosion inhibitor, promoting the development of a protective film on metal surfaces.