Chrome aluminum coil

TMR Aluminum manufacture Chrome aluminum coil,Chemical degreasing aluminum coil,Passivated aluminum coil

Chrome aluminum coil

Alloy 1060, 1070, 3003
Width 0-1500MM
Thickness 0.3-6mm
Port of Loading Qingdao
Price USD2000

Aluminium alloy chrome treatment is a commonly used pre-treatment method for aluminum products.
A passivation film is formed on the surface of the product to enhance the corrosion resistance of the product and the adhesion of the coating.
At present, the commonly used types of chromization are trivalent chromium chromation and hexavalent chromium chromation. Environmental pollution due to chrome film
Severe infection, residual chromium is harmful to the human body. Therefore, the treatment of trivalent chromium and hexavalent chromium will gradually be treated by chromium-free conversion.

 

Crafting process of aluminum coil chromodised
The general chromizing process is as follows:
1. Degreasing:

Degreasing is the removal of oil on metal surfaces by alkaline degreasing solution. Aluminium alloy has poor alkali resistance,
It is not suitable to use strong alkaline cleaning, so the concentration of the bath solution should be controlled. Generally, the concentration of the degreasing solution can be adjusted according to
Prepared by manufacturer's instructions. In addition, proper heating and constant stirring will accelerate the chemical reaction.
Enhance degreasing effect. Typical parameters are as follows:
Bath temperature: 60-65 ℃
Concentration (V / V): According to the instruction
Dipping time: 5-7min
Cyclic state: ultrasonic oscillation
2. Water washing:

After degreasing, the degreasing liquid attached to the surface of the product needs to be cleaned with tap water. Usually put
The washing tank is designed as an automatic overflow to ensure that the water in the tank is not seriously polluted. Washer
The technical parameters are as follows:
Bath temperature: normal temperature
Total alkalinity: ≤1.0
Dipping time: 30-40S
Supply status: continuous water supply
3. Light emission:

after degreasing, salt corrosion products will remain on the surface of the product. The purpose of light emission is to
Some residues were removed. sold out
The liquid is an acidic liquid. The concentration of the tank liquid should be controlled. Generally, it should be prepared according to the instructions provided by the manufacturer.
system. The process parameters are as follows:
Bath temperature: normal temperature
Concentration (g / L): According to the instructions
Dipping time: 2-3min
Circulation status: compressed air
4. Washing:

two rinsing processes should be carried out before chromization, in order to ensure that the residue on the surface of the product is thoroughly cleaned.
Bottom removal, tap water can be used for the first water wash, pure water can be used for the second water wash to prevent the contamination of the tap water
dye. The parameters of the two washing processes are as follows:
1) Tap water washing:
Bath temperature: normal temperature
Total acidity: ≤1.0
Dipping time: 30S
Supply status: continuous water supply
Circulation status: compressed air
2) Pure water washing:
Bath temperature: normal temperature
Conductivity: ≤100us / cm
Dipping time: 30S
Supply status: continuous water supply
Circulation status: compressed air
5. Chromification:

The quality of chromization directly affects the product's corrosion resistance and the binding force with the coating. Chrome
The process parameters will be based on aluminum
Different alloy grades are slightly different. Generally, the manufacturer's instructions only indicate the range of the parameters.
Should be appropriately adjusted according to the material and requirements of the product. The following is a parameter range of hexavalent chromium
Around:
Bath temperature: normal temperature to 38 ° C
Concentration (g / L): 12-14
PH: 1.3-1.6
Dipping time: 3-6min
Circulation status: compressed air
6. Pure water washing:

Rinse with pure water after chromizing. The basic parameters are as follows:
Bath temperature: normal temperature
Dipping time: 30S
Supply status: Reverse water supply
Circulation status: compressed air
7. Hot pure water washing:

After washing at room temperature, it should be washed with hot pure water to completely remove the chromium on the residual surface.
Remove. The basic parameters are as follows:
Bath temperature: 50-60 ℃
Conductivity: ≤100us / cm
Dipping time: 30S
Supply status: continuous water supply
Circulation status: compressed air
8. Drying:

The drying time can be adjusted according to the water and structure of the product. The drying temperature cannot be too high.
In order to prevent the chrome layer from aging.
The basic parameters are as follows:
Drying temperature: 50-60 ℃
Drying time: 5-15min


Chrome quality inspection
1. Film appearance: The color of the film is uniform.
2. Corrosion resistance: judged by salt spray test.
3. Chromium weight: Through the chromium weight test, the compactness and thickness of the chromium layer can be detected.

 

Choose chromized aluminum coils ,we are the best choice.Looking forward to your inquiry.

Aluminum products of TMR meet the export popular

Plastic movie and brown paper can be protected at customers’ need. Also timber case or timber pallet is adopted to shield products from harm for the duration of the delivery.

There are styles of packaging, which is eye to wall or eye to sky. Customers can choose either of them for their convenience.

1. What's the MOQ?
Usually, CC materials for 3 tons, DC materials for 5 tons, some special products are different, pls consult our salesman.
2. What's the payment term?
LC ,TT
3. What's the lead time?
Common specification 10 -15 days, others 30 days or so.
4. How about the packaging?
Standard export packaging, wooden cases or pallets.
5. Could you send us the free sample?
Yes, the small pieces can be provided for free, but the buyer need to bear the freight charges.

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