Na4CrO4

Sodium chromate (Na₄CrO₄) is an inorganic ceramic compound belonging to the chromate salt family, commonly encountered as a bright yellow powder or crystalline solid. It serves primarily as a corrosion inhibitor and oxidizing agent in industrial applications, particularly in metal treatment, cooling systems, and protective coatings where its chromate anion provides passivation of steel and ferrous substrates. Engineers select this material for systems requiring cost-effective corrosion protection in aqueous environments, though its use is increasingly regulated in some jurisdictions due to chromate toxicity concerns, driving migration toward alternative inhibitors in new designs.