This product is suitable for galvanizing white passivation layer passivation film with a plain bright colors, excellent corrosion resistance, is environmentally friendly products, eliminating the hexavalent chromium contamination in the production process, but also to meet the product free of hexavalent chromium needs, in line with the European Union and the United States GMF0025H and GMW3044 standard, simple to use and stable. Salt spray test up to 36 hours. First, the use of technology: trivalent chromium white zinc 3 to 5% (by volume) PH value of 2.0 to 3.0 for 7 to 10 seconds at 25 to 35 degrees two |, galvanizing process - water - light (1% to 2 % nitric acid) - washing - passive - water - hot water - hot air drying III Maintenance: solution in the course of PH value will gradually increase, the need of additional silver trivalent chromium passivation agent, and after tune with diluted nitric acid PH value to the process range. If the PH value is too low, caustic soda solution can be diluted to increase the PH value. Fourth, adjust passivation solution: 1. passivation solution during use, PH value will gradually increase, the need of additional silver trivalent chromium passivation agent with nitric acid diluted and adjusted to within the range of 2.0 to 3.0. 2. passivation solution should add less spare. A Notes: 1. This product adjust PH must use nitrate. 2. After passivation solution preparation before use PH value should be measured to ensure that within the process, new bath with a good PH value is generally around 2.0. 3. The thickness of the coating takes up to 8 microns or more, in order to ensure its resistance to corrosion. The passivation process should continue to shake the workpiece to a passivation film evenly. This product is corrosive, not hand contact. 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