TN-400 galvanized trivalent chromium passivation agent, blue and white, a wide range of operational and management easy to get bath blue-white appearance. 1. do not use ?? specialty oxidants. 2. All kinds of galvanized roll, hanging plating are applicable, and a uniform blue-white appearance. 3. neutral salt spray test white rust of time between 72 to 120 hours. ?? Use a galvanizing process. (Thickness: at least 8 microns) → washing → two light (nitric acid: l%) → two two washing → passivation → washing → drying (70-100 ℃) ※ production operation passivation of zinc metal content was controlled at 8g / L or less, iron metal content control in 80mg / L or less. II. Processing Conditions Condition Range reference value TN-400 30 ~ 70 / L 40ml / L Temperature 20 ~ 30 ℃ 25 ℃ dip Ze time 10 to 30 seconds 15 seconds stirring air or mechanical air four, the preparation and maintenance of a passivating solution, To join in the passivation bath with two-thirds of the volume of water, adding TN-400 passivation solution, add water to the required volume, stir, detection passivation solution PH value (with diluted nitric acid or 10% of the hydroxide sodium adjust the PH value), heated to operating temperature can be put into operation. 2, PH value of the operation during passivation passivation solution will gradually rise, add dilute nitric acid or TN-400 passivation solution (based on analysis of the concentration of added) to reduce the PH value. 3, bath supplemented by timing TN-400 to maintain, add the amount of: rack: 0.75- 1.5L / 100m2 Barrel: 1.2-3.0L / 100m2 due to the different shape of the workpiece, bring out different amounts suggested by the analysis added. 4, when the workpiece after processing a large area of ??yellow spots or white spots are now adjusted invalid, the proposed re-allocation slot. 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