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Matching groove and process parameters:
Color index: coloring salt I: 5--7, coloring salt II: 35--42
Free sulfuric acid: 15--22g/L
Temperature: 20--35℃
Voltage: 15-18V
Time: 1--12 minutes (depending on the color depth)
Consumption:
About 8-10Kg per ton of aluminum (450㎡).
The imitation gold colorant should be replenished every day according to the analysis result.
Analyzing method
Determination of coloring index:
Take 10.0mL tank solution in 50mL volumetric flask, add distilled water to the scale, take 20.0mL of the above diluted solution in 250mL iodine measuring flask, add 10mL concentrated hydrochloric acid (HCL content of 37%) plus water about 60mL, and then add 3-4g kI and 2g KF.2H2O, stir well until the sample is reddish brown and then place it in the dark and leave it to stand for 5 minutes, add 2ml 1% starch Add 2ml of 1% starch indicator solution, titrate with 0.1N Na2S203 standard solution, when the color changes from reddish brown to pink, it is the end point, and the solution becomes clear and transparent at this time.
Calculation: coloring salt I = 9.87-N-Na2S203
Take 10 ml of test solution in 250 ml cone, add about 100 ml of pure water, add 1-2 g of potassium fluoride, add a small amount of ammonium urethrate, add 10 ml of 4 + 6 ammonia, with 0.05 M EDTA standard solution, titration until the solution becomes purple-red as the end point, record the number of ml of the drop V.
Calculation: coloring salt II = 312-V-EDTA-M-EDTA
Determination of free H2S04 concentration:
Take 5.0 ml of test solution in a 250 ml beaker, add 100 ml of water, measure its pH value with a PH meter, stir with a magnetic stirrer, titrate with 1N NaOH standard solution until the pH is 3.6 when it stops, record the number of milliliters of NaOH volume consumed A.
Calculation: free H2S04 (g/L) = 9.8-A-NNaOH
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