This product is suitable for the alkaline non-cyanide zinc, cyanide and acid chloride zinc galvanizing and other galvanized zinc coating processes obtained, obtaining a clear blue white passivation film. Neutral salt spray test up to 48 hours without white rust, 72 hours without red rust. SGS testing in line with EU standards. After the TN-300 TN-300 magazine long life high tolerance TN-300 easy to produce plated handle common macular TN-300 is a trivalent chromium solution, therefore reducing wastewater treatment costs, while meeting the customer's environmental disable hexavalent chromium passivation require a recommended process: TN-300 trivalent chromium blue zinc passivation agent 30-50ml / L 10-20 seconds immersion time temperature 20-30 degrees PH 1.8-2.2 (adjusted with nitric acid PH value) Second, supplement and maintenance: When the passive film blue shallow to 1-2% of the new liquid supplement, usually a few weeks after the rush to part of the old liquid, liquid to fill the new. Before passivation and dilute nitric acid. After drying temperature between 38-55 degrees passivation (passivation film temperature is too high will cause fading). 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