Inhibition of Surface Corrosion Behavior of Zinc-Iron Alloy by Silicate Passivation

The passivation of zinc alloy coating was achieved through the utilization both silicate and trivalent chromium systems, employing a specific process formula consisting Co(NO3)2 at concentration 2.5 g/L, C76H52O46 3 mL/L, Na2SiO3 25 C6H5Na3O7 15 an appropriate amount organic accelerator. composite tannic acid found to be more effective than film, as it successfully eliminated dendrite structure on surface reduced defects. coordination between negatively charged SiO2− or SiO2 micelles Zn2+ results in formation film that exhibits lower corrosion current higher potential compared film. Additionally, impedance test fitting indicate possesses resistance value. Overall, proposed system presents viable alternative toxic chromate system, offering non-toxicity superior protective performance relative system.