--Yunyun Environmental Protection Materials Technology (Guangdong) Co., Ltd.

Aluminum colored chroming agent CHC (AB) (liquid)

product descriptions

name said

oxidation Auxiliary Agent

model/specification

CHC (A/B)

characteristics

Aluminum colored chroming agent CHC (A/B) (liquid) is a colored chroming agent used by mixing two liquids A and B. It is suitable for aluminum and aluminum alloys. The color can be adjusted by adjusting the content of A and B liquids. Different shades from light color to dark yellow have the following characteristics:

Easy to operate and can be suitable for different aluminum (alloys).
The chromed film is average and has strong corrosion resistance.
Low concentration treatment will not affect the conductivity of aluminum.

conditions of use

Pure aluminum parts
	standards	scope
CHC (A)	20 ml/L	5-50 ml/L
CHC (B)	10 mg/L	5-25 ml/L
pH value	1.7	1.5-2.0
Wen degrees	20℃	20-35℃
when between	2 minutes	20 seconds-3 minutes

Process flow:

Oil removal (AL-CLEAN DA5, PC-25 or special degreasing agent MC)→ Roughening (AL-EN) or chemical polishing (AL-CP2)→ stain removal (AL-D30)→ chroming (CHC)→ water washing → low-temperature drying

aluminum casting
	standards	scope
CHC (A)	20 ml/L	20-50 ml/L
CHC (B)	10 mg/L	10-25 ml/L
pH value	1.7	1.5-2.0
Wen degrees	20℃	20-35℃
when between	2 minutes	20 seconds-3 minutes

Process flow:

Degreasing (AL-CLEAN DA5, PC-25 or special degreasing agent MC)→ activation (mixture of nitric acid and hydrofluoric acid)→ stain removal (AL-D30)→ chroming (CHC)→ water washing → drying

package and storage

25 liters/barrel, liquid, stored in a cool and dry warehouse. Direct sunlight is strictly prohibited. High temperatures and high temperatures must be closed and sealed after use.

precautions

If the content of chroming agent A is increased, the color will turn brown; if the content of chroming agent B is increased, the color will turn colored.
Do not touch the workpiece with your hands before drying, and there must be enough space between the workpiece during operation.
Dry below 70 ° C, otherwise the formation of chromated film will be affected. The chromated film does not need to be too thick, otherwise it will be poor.

Wastewater treatment: Add sodium bisulfite to CHC wastewater (per 10 ml/liter of CHC-A, add 3 g/liter), use sulfuric acid to adjust the pH below 3, add 0.5 g/liter of ferric sulfate and organic coagulant, and then filter the precipitate. Neutralize the pH to 7-8 with sodium hydroxide and filter the precipitate. Dilute 4 times with water and continue filtering.

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