BLACK - AL
Black- AL is a rapid acting chemical conversion liquid compound for blackening aluminum and aluminum dicasts parts by immersion at room temperature. The product is a mildly acidic solution containing no Chromates, Sulfides, Cyanides, Caustic or Phenols.
Use an acid resistant container for the immersion tank. Plastic, plastic lined, glass or rubber lined tanks are suitable. Do not use an uncoated or bare metal container. Black- AL should be diluted with equal volume parts of water (50% to 50% of water by volume). Determined by test usually a period of 10 to 60 seconds is needed to produce a uniform black finish. The immersion time can be shortened by using a stronger solution or lengthened by using a weaker solution.
Deoxidizer: Use 238- L Deoxidizer to deoxidize the aluminum parts. Then, rinse parts with cold water. 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.
Rinse thoroughly with over flowing cold water to stop the chemical reaction and towel dry. Then seal with a top coat such as WSL- 55, Trilac 747, or AL-70. Parts can be immersed in water soluble lacquer while still wet from the preceding rinse, or can be sprayed or sealed. The Black- AL finish in itself imparts very little to no corrosion resistance to the Aluminum surface. However, its crystalline structure is porous and will absorb the sealant or lacquer, promoting long-term corrosion resistance.
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.