Zinc and chromium color 
 Trivalent chromium color dull 7-8% 
 PH value of 1.8-2.2 
 Temperature of 25-40. C 
 Soaking time 25-45 seconds 
 Maintenance: the process of using the PH value will rise if the saturation concentration of passivating agent can be added enough body, adjust PH to process the range, if the PH value is too low, add caustic soda to increase PH value. 
 Process: Galvanized - washing - washing - the light (3% nitric acid) - washing - chromium color blunt - Washing - Drying - Packaging 
 Packing: 30kg / barrel