Black -AL is a concentrated, rapid acting chemical conversion
liquid compound for blackening Aluminum parts by Immersion at 150-160
degrees Fahrenheit. The product is a mildly acidic solution containing
no chromates, sulfides, cyanides, caustic or Phenols.
Preparation of Black -AL:
Use an acid resistant container as the Immersion tank.
Plastic, plastic lined, glass or rubber lined are suitable. Do not use
an uncoated metal container. Black AL should be diluted with equal volume
parts of water (50% to 50% of water by volume). Determined by tests
usually a period of 10 to 60 seconds is needed to produce an uniform
black finish. The Immersion time can be shortened by using a stronger
solution or lengthened by using a weaker solution.
Important:
Black AL is not designed to clean the surface. For good results,
parts must be free of oil and rust.
OPERATION CONDITION:
- The parts should be thoroughly cleaned and deoxidized prior to blackening. AC-220 which is an aluminum Hot soak cleaner, is recommended for removing heavy oils. Do not use petroleum degreasing solvents which leaves a residue on the surface.
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- Rinse thoroughly with over flowing cold water to remove residual cleaners and dust. It is important that alkaline cleaners are completely rinsed off prior to blackening.
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- Deoxidizer: Use 238-L Deoxidizer to deoxidize the aluminum parts.
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- Rinse parts with cold water.
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- Immerse parts in Black - AL solution for 10 to
60 seconds. Agitate the parts to break air bubbles and to assure
solution contact with all surfaces. Plastic or plastic lined
baskets should be used for small parts.
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- Rinse thoroughly with over flowing cold water to stop the chemical reaction.
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- Top Coat: Trilac-WSL-55 or Trilack 747: Parts can be Immersed in a water soluble lacquer while still wet from the preceding rinse, or can be sprayed or sealed. Triblack-AL finish in itself imparts very little corrosion resistance to the Aluminum surface. However, its crystalline structure is porous and will absorb the sealant or lacquer, promoting long term corrosion resistance.
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Trouble Shooting:
A non-adherent, spotty black finish indicates improper cleaning and deoxidizing, or poor rinsing. Good rinsing is essential for long life of Triblack-AL
Solution Control
The blackening process with Black AL is a chemical reaction
between the solution and metal surface. Chemical activity is gradually
diminished as the solution is used but may be restored ot the desired
strength by adding fresh concentrate. When Immersion time necessary
to produce the desired black is increased, add sufficient concentrate
to reduce Immersion time to your previous standard. Keep a record of
additions to establish a bath history.
Caution:
Black AL concentrate and the process is mildly acidic. Precautions
for handling this type of material should be observed (corrosive). Avoid
contact with skin and eyes. Use protective clothing (aprons, face and
eye shields, rubber gloves) when handling chemical material. In case
of contact with skin, flush area with large amounts of water; for eyes,
flush with large amounts of water and get medical attention.
The solution should be considered toxic if taken internally!
The information stated herein is based on information and tests we believe to be reliable. The accuracy or completeness thereof is not guaranteed. Since conditions of use are outside our control, user shall, before using, determine the suitability of the product for his intended use and user assumes all risk and liability in connection therewith.
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