CP-614 is suitable for forming a colorless and transparent passivation film layer (0.3~0.5 μm) on the surface of aluminum and its alloys. It has excellent anti-corrosion performance and decorative properties, and has excellent anti-tarnish ability. The film layer is dense and uniform, and the appearance is colorless and transparent. The colorless chromium film obtained by CP-614 chromization treatment has low resistance, which can significantly enhance the bonding force between the workpiece and the coating.

2. Selection of Products

CP-614 Chrome solution

3. Bath Control

State	Orange Red Liquid
Bath Concentration	1-2%
Cr 6+ Control	1.5-3.0pt
Processing Temperature	55-70°C
Processing Time	4-6min
Processing Method	Dipping, Spraying

Prepare 1000kg bath

Add 4/5 of the operating weight of water to the tank, add CP-614 chromating solution according to the required concentration, and add water to the operating weight. The parameters of the bath are detected and heated to the required temperature.

Note: The bath should be prepared with deionized water.

Titration method for Cr 6+ :

Use a pipette to pipette 10 ml of working solution into the Erlenmeyer flask and dilute with 50 ml of distilled water;

Add 20 ml of 25% H 2 SO 4 , add 2~3 grams of KI, and let it stand for 1~2 minutes;

Slowly titrate with 0.1N Na 2 S 2 O 3 under constant stirring until the solution turns from brown to yellow;

Then add 1~2 ml of starch indicator, and then continue the titration until the solution turns from black to light green;

The number of milliliters of 0.1N Na 2 S 2 O 3 solution used is the number of Cr 6+ points.

Addition of bath: every 1000kg of bath increases the chromium point by 0.1pt, and about 0.7kg of CP-614 needs to be added.

4. Equipment Material

Process tanks, housings, pumps and piping are made of stainless steel such as 316L or 304L. 316L is for maximum tank life. Heat exchanger plate reaction is polished 316 stainless steel. Gas burner tubes are not recommended. All process circulation pump seals, valve seats, etc. that come into contact with process solutions and acidic equipment cleaners shall be ethylene propylene rubber, Viton or Teflon materials. Chemical feed pump components and other elastomers that may come into contact with concentrated make-up chemicals should use Viton or Teflon materials.

5. Storage

This product is an acidic liquid, stored in a ventilated place indoors, away from lye.

6. Safety Matters

When using CP-614, the operator should wear protective equipment, especially protective glasses to protect the eyes, so as to prevent the eyes and skin from being stained with the chromium solution.