Green color zinc passivating agent, trivalent chromium Choi zinc, color zinc passivating agent Supply

[Trivalent chromium Choi zinc coating treatment agent at room temperature - Operating Instructions] A01-234C 1, the characteristics and uses environmentally-friendly products, no hexavalent chromium; a single dosage form products, simple operation, easy wastewater treatment; Appearance bright color passivation obtained yellow, blue, purple, red and other bright appearance; galvanizing process applies to all post-passivation treatment, corrosion resistance is excellent; can operate at room temperature, can be overcome in a rack plating process, use the plus When the temperature of the bath passivating agent because the temperature difference caused by lower product color inconsistencies shortcomings. 2, operating conditions and precautions 2.1 Operating Conditions hanging plating barrel a bath concentration (by volume) 9-12% 10-15% Temperature (℃) 18 ~ 32 ℃ 18 ~ 32 ℃ pH value of 1.45 to 2.6 1.45 to 2.6 passivation time (sec) 25 to 60 seconds from 35 to 45 seconds stirring mechanical stirring or mechanical agitation or air agitation air agitation drying 60 ~ 80 ℃ 30 ~ 25 分钟 60 ~ 80 ℃ 30 ~ 25 分钟 2.2 Notes a) The product For temperature, PH value and the immersion time are highly complementary. In the summer high temperature, PH value can increase or decrease the time to adjust the color of the product; in winter, and vice versa. For example: when the winter temperature at 18 ℃, PH value can be selected between 1.65 to 2.0, on time and in 40 seconds to 60 seconds, you can make the appearance of qualified products. b) trivalent chromium content is rack 3 ~ 5g / L, the equivalent of liquid accounted for 5.5% to 9%. When barrel plating of trivalent chromium content 4 ~ 7g / L, equivalent to 7% of the stock solution to 12.5%. c) drying the product after passivation good and proper storage [Cr6 +] test is essential for IEC-62321. IEC-62321 9.1 storage conditions specified sample is a relative humidity of 45% to 75%, temperature 15 ~ 35 ℃ 3, the use of a bath 3.1 a) hanging plating bath proportion accounted for by liquid 9 to 12 percent, according to Barrel 10 to 15.5% a bath b) such as a bath volume of 1,000 liters, a bath concentration of 8% were taking dope 80 liters, 920 liters of water and mix well. Can be used to adjust the PH value of 10 to 15% sodium hydroxide or 15 to 25% sodium carbonate solution and dilute nitric acid (42 ~ 48%) c) of this product acidity, after 8% (V / V) a bath PH will be between 1.5 to 1.6. Available between base adjusted to PH = 1.8 to 2.0. 3.2 bath supplies a) In order to maintain the chromium ion concentration and PH value of the bath, you need to add liquid tank (A01-234C) and nitric acid. b) barrel plating bath to bring out the more serious, it is recommended A01-234C: 42% nitric acid = 3 to 4: 1 paired to complement the mixture, hanging plating press A01-234C: 42% nitric acid = 4 to 5: 1 is add. 3.3 bath maintenance a) continuous production, at least every hour to monitor the pH of the bath once, or according to the color change of the product at any time adjust. b) deal with daily bath Cr3 + concentration conduct a test, if you find any holes or edge of yellow fat coke phenomenon, should discharge portion bath, bath replenished built, emissions depending on production conditions. c) the bath iron is the main impurity, proved when iron ion concentration is greater than 150ppm would reduce the salt spray test. 4, measuring the concentration of trivalent chromium ions with 4.1 5.0ml pipette to draw the bath into a triangular 250ml conical flask with water 80 ~ 100ml 4.2 10ml of sulfuric acid was added 1 + 1 and 1% orthophosphoric acid and 1% silver nitrate 10ml 10ml, final Join 2g ammonium persulfate. 4.3 The triangular pyramid bottle is placed in boiling heat 2 to 3 minutes on a hot plate and cooled to room temperature, add phenyl-generation anthranilic acid 6-8 drops indicator. 4.4 turns from bright green and purple with 0.1mol / L standard titration of ammonium ferrous sulfate solution as the end of three, the number of milliliters consumed recording V. 4.5 Calculation of trivalent chromium concentration (g / L) = molar concentration of 0.0173 × C × V × 1000 5 wherein C- standard ferrous ammonium sulfate, the unit is mol / LV- consumption volume of standard ferrous ammonium sulfate, units as ml NOTE: The standard ferrous ammonium sulfate solution new dosing more accurate. 5, the passivation process anomalies anomaly Cause goods too light, golden yellow and not colorful ① PH value is too high for too short ② ③ Cr3 + add the right amount of nitric acid concentration is low ① ② ③ adding an appropriate amount of time to extend the passivation uneven liquid color, the product of piebald (map-like pattern) ① PH value is too high or too many impurities ② ③ poor mixing bath cycle ② ① added nitrate pollution, complementary bath built ③ strengthen stirred white holes, the workpiece edge Pan-Purple ① PH value is too low alkali ① PH value rises too deep color, yellow fat coke hole ① PH value is low for too long passivation ② ③ Fe ion content is too high with a base to raise PH value ① ② slightly shorten time ③ passivation sewage STATEMENTS: This technical information and data on all of the recommendations of the company's products, based on experiments and information dependence of the Company as the standard, all practitioners such as breach of operation or changed after the data, the adverse consequences The Company assumes no responsibility for the above recommendations and the data can not be used as evidence of copyright infringement.