Qingdao Hongan Surface Material Technology Co., Ltd. is committed to manufacturing professional products, continuous innovation and manufacturing, to provide customers with professional services.

Product Features
--------

1. Green environmental protection passivation solution, in line with the EU ROHS, WEEE and ELV regulations, through the SGS standard testing.
2. alkali zinc salt spray time more than 200 hours:
3. Acid zinc hanging plating, salt spray time 96 hours
4. Acid zinc rolling, salt spray time 72 hours
5. Suitable for acid zinc and alkali zinc passivation treatment

Method of use
--------

Treatment process (galvanizing process omitted)
Electroplating → water washing → water washing → light activation → water washing → trivalent chromium passivation → water washing → water washing → drying

Method of use
--------

management method
--------

The amount of passivating agent supplied is proportional to the treated area:
About 1 passivator should be added for every 5000dm of plated parts treated, but due to the requirements for the product and the belt
There are some differences in the amount of output, etc.
When used for barrel plating, due to the relatively large amount of carry-out, the amount of passivation agent should be appropriately increased to maintain blunt.
The concentration of the liquid.

PH of passivation solution:
PH-value: alkali zinc 2.5(2.0~3.0)
Zinc acid 2.2(1.8~2.8)
Adjust with diluted nitric acid or sodium bicarbonate
pH-value:<1.8, anti-corrosion ability decreases pH-value:>3.0, the surface of the passivation film appears yellow, anti-corrosion ability decreases Remarks: pH of zincate zinc plating should be controlled at the lower limit, and potassium chloride zinc plating should be controlled at the upper limit

Updated passivation solution:
The service life is long, and the passivation solution needs to be replaced when the zinc ion content in the passivation solution is greater than 6g/L.
When the concentration of iron ions in the passivation solution is higher than 200ppm, the passivation agent needs to be replaced.

analysis method
Reagents: 10% sodium hydroxide, 30% hydrogen peroxide, concentrated hydrochloric acid, potassium iodide, 0.1M sodium thiosulfate solution, 1% starch solution steps: remove 10m1 into 250ml conical flask, add about 50ml deionized water, adjust pH to about 10 (color change) with sodium hydroxide solution, add about 0.3m1 hydrogen peroxide, heat boil solution for 30-40 minutes, completely remove excess hydrogen peroxide, cool solution and acidify with hydrochloric acid, at this time color should be orange, about 2g of potassium iodide was added and titrated with 0.1M sodium thiosulfate to a pale yellow color. Add a few drops of starch indicator, and titrate 0.1M sodium thiosulfate solution to light green. Conversion: milliliters consumed x0.66 = Vol%HK-201