Choi zinc trivalent chromium passivation agent, passivation agent color zinc, trivalent chromium Choi zinc coating treatment agent

 ? [Trivalent chromium Choi zinc coating treatment agents - Instructions] A01-134A - a bath agent A01-134B - supply agent 1, product features environmentally friendly products, no hexavalent chromium; simple, 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;? This product is a double dosage. A preparation for the construction of bath agent, B agent is a replenishment agent. 2. Operating conditions: The project hanging plating barrel plating bath built concentration (by volume) 10 to 12% 11 to 15% Temperature (℃) 52 ~ 60 ℃ 55 ~ 65 ℃ pH value of 2.0 ~ 2.42.0 ~ 2.4 passivation time ( sec) 55 to 60 seconds from 35 to 45 seconds with stirring or mechanical agitation air agitation or mechanically stirring air agitation drying 60 ~ 80 ℃ 30 ~ 25 分钟 60 ~ 80 ℃ 30 ~ 25 minutes 3, using the method: 3.1 a bath a) Calculation A01-134A (a bath agent) required to calculate the required amount of a bath agent and a water bath according to the required amount of volume (L) and the target Cr3 + content. Example: 2400 should be prepared to hoist the national use of Cr3 + plating color zinc bath, target Cr3 + content was 4.5g / L, calculated A01-134A and water consumption, feed tests show A01-134A Cr3 + content of 54.38g / L. A01-134A required for the number of liters = 2400 × 4.5 ÷ 54.38 = 198.6L b) use A01-134A barrels A01-134A barrel 25Kg, the relative density of 1.40 per barrel volume: 25 ÷ 1.40 = 17.86 (l) use number of buckets: 198.6 ÷ 17.86 = 11.12 (barrels) c) required pure water required: 2400-198.6≈2200L 3.2 preparation operation a) clear channel put a net old bath, remove the old tank parts, debris, wall cleaning brush clean, check the air distribution pipes and heating equipment intact firm; b) the total amount of added water by water, to join the 80 to 90% amount; c) plus A01-134A added by precalculated amount ; d) adjusting the pH value Stir formulated after the first test sample at room temperature, pH value, with 45% or 20% nitric acid industry soda (Na2CO3) solution coarse, pH = 2 ~ 2.2; e) add the remaining water to a predetermined volume; f) the sampling inspection bath Cr3 + content and pH value; g) compliance with operating conditions after bath, heating, heated to operating temperature after 60 ℃ ± 2 ℃ for 1 hour; h) the heating process, involving to work bath of chromium ions complexed dynamic equilibrium dissociation, pH values ??will change, so the heated one hour after the pH needs to be adjusted again until compliance with the range of operating conditions; i) test plating passivation take a good piece, in the form of hand-operated press plating → washing → washing → Idemitsu ※ → washing → passivation → washing → washing → drying process, do try passivated. ※ light water with nitric acid formulated with a pH range of 1.5 to 1.8. Passivation test normal, indicating a bath done correctly, try not normal general passivation by the following circumstances; j) test abnormal phenomenon of passivation treatment: passivation anomaly Cause workpiece lighter color (no color, showing Golden) ① ② PH value of high temperature low short passivation time ③ ④ ⑤ Cr3 + stirring too slowly beginning to build a low content ⑥ ① correction bath temperature, adjust the bath temperature ② correction acidity, PH value adjustment appropriate to extend the passivation time ④ ③ ⑤ increase the stirring intensity analysis Cr3 + concentration should be the concentration of L after 3g / ⑥ more than a bath, at least one hour before use after aging passivation workpiece does not clear, moldy ① pH value is too low ② bath Zn2 + content is too high ③ bath temperature is raised too high pH value ① ② drain part syrup, again in order to build a bath bath agent complement ③ reduce the bath temperature around the white hole ① pH value is too low ② piece burr hole at excessive adjustment ① Check the pH value ② hole near the plating, the plating process to improve the hole too deep color, showing focal yellow ① pH value is low ② Cr3 + content is too high for too long ③ ④ ① high temperature to increase pH value ② stop supply of medicine, Most emissions bath to flush diluted ③ ④ shorten time passivation passivation reduces the temperature of the workpiece after flooding (show map striated) ① pH value is too high for too long to use liquid ② ③ Cr3 + concentration low pH adjustment ① value ② drained 1 / 5-1 / 10 old bath, a bath agent to add a bath ③ additional A01-134A 3.3 normal passive job and Bath maintenance a) Cr3 + passivation process color process is as follows: Plating → washing (or ultrasonic wash) → light → washing → passivation → washing → washing → → (roll) → 70-80 ℃ hot pure water hot wash → discharge, centrifugal drying → drying 60-80 ℃ → sorting packaging → (hanging) → pure water washing → cold wind (wind screens) → hot air → under hanging → sorting, packing b) adding the liquid color Cr3 + passivating agent after a bath, with the pH value passivated gradually increased, Cr3 + concentration will gradually decrease when the pH is raised to exceed the operating range of the workpiece will be bad, and rapid changes in pH, the impact on passivation more sensitive, relatively speaking, the change is slow Cr3 + concentration and insensitive impact on the passivation. For the above must be added in time. A01-134B Cr3 + color passivation supply agents are specially designed to add the bath. Since the passivation performed, except that the bath pH rises, Cr3 + decline, but also accompanied by Zn2 +, Fe2 + of pollution, A01-134B bath may play a protective role. The added liquid forms: 1. Cr3 + results were added to the stock solution of nitric acid and A01-134B and analysis based on the measured pH value to manually add; 2. You can use the meter by automatically adjusting to join, such as continuous industrial pH meter Bath pH value measurement, upper and lower limits set by the instrument's output control, respectively, the nitric acid and liquid from the dosing pump to add slot; 3. Can the nitric acid and A01-134B by a certain percentage (usually liquid (A01 -134B): 45% nitric acid: water = 1: 1 to 1.5: 0.5 to 1) automatically added by manual or mechanical. 4. You can A01-134A and A01-134B by a certain percentage (A01-134A: A01-134B = 1: 2-3) by artificial additives. c) Bath maintenance 1. Normal operation, despite the appearance of normal passivation out of the workpiece, should strive to maintain the pH of the bath stable, qualified to install continuous measurement of pH or acidity of the industry, not yet qualified for each h to measure a pH value of the sample; 2. a bath every day to measure the concentration of Zn2 +, Zn2 + when reached 6 ~ 8g / L to drain 1/5 bath, a bath again with A01-134A supplement; 3. Each Ban use magnet to absorb a fall into the bottom of the workpiece in order to avoid Fe2 + content increased. Fe2 + content increased salt spray can cause shortened; when not in use 4. Bath stamped cover, in order to avoid contamination, or pumped into the line outside the store; 5. stirred by air should be clean and free of oil, Do not use a reciprocating compressor to produce compressed air, as produced by the Roots blower centrifugal fan or multilayer low-pressure air. d) the importance of PH value passivation solution passivation operation are all currently under acidic conditions, because only in the acidic environment, passivation solution was able to carry out the oxidation-reduction reaction, conversion coating can be formed, so that the control is good Acidity PH value, it becomes especially important. Passivation process is a contradiction simultaneous dissolution and generate opposition dynamic process, that is the solution in this aspect of the passivation film is formed, on the other hand because the solution is acidic, the passivation film is also dissolved, if the PH value is too low, it will quickly dissolve after the formation of passive film. However, if the PH value is too high, the resulting soft dense passive film is poor, poor adhesion, and easy to fall off. So to maintain a certain PH value is one of the main conditions for the formation of the passive film. Statement: in this technical information and data on all of the recommendations of the company's products, the company is dependent on experiments and information as the standard, all practitioners such as breach of operation or changed after the data, the adverse consequences that the company does not assume any responsibility, the recommendations above and data can not be used as evidence of copyright infringement.