Fine Crystal Zinc Phosphate Coating - Freiborne Industries, Inc Fine Crystal Zinc Phosphate Coating - Freiborne Industries, Inc

Product Type: Formcoat 7
   

Formulated to impart a fine crystal, zinc phosphate coating on aluminum for the purpose of lubricant retention to facilitate cold forming. For phosphate free aluminum forming look at Freiborne’s Precoat 1 chemistry.

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FORMCOAT 7 chemicals are formulated to impart a fine crystal, zinc phosphate coating on aluminum for the purpose of lubricant retention to facilitate cold forming of the metal.

After filling the tank to the three quarter level with water add 80 gallons of FORMCOAT 7A chemical and 165 lbs. of Freiborne NEUTRALIZER 8 for each 1000 gallons of working solution required. Bring the solution level to operating depth and heat to 125-135°F. With vigorous stirring add 80 lbs. of FREIDOX 3 for each 1000 gallons of tank volume. Immersion time is usually 7-10 minutes.

Total Acid – Pipet a 2ml. samples, add 10 drops of Indicating Solution 3 (phenolphthalein) titrate with Testing Solution 11 (0.1N NaOH) to a permanent pink. A solution as prepared above will require 10 mls. and is known as a 10 point bath. Maintain the total acid between 9.5 – 10.5 by adding 100 lbs. (8½ gallons) of FORMCOAT 7B chemical, 25 lbs. of FREIDOX 3 and 25 lbs. of Freiborne NEUTRALIZER 3 to raise one point per one thousand gallons of working solution.

NEUTRALIZER 8 –
To the sample used for checking total acid, add a level teaspoon of Testing Powder 47, rezero the buret and again titrate with Testing Solution 11 to a faint permanent pink. The range for NEUTRALIZER 8 should be between 4.0-8.0 for a 10 point Total Acid bath. An addition of 22 lbs. of NEUTRALIZER 8 per one thousand gallons of working solution will raise the concentration one point.

Free Acid – Pipet a 10 ml. sample, add 3 drops of Indicating Solution 11 (Bromphenol Blue) and titrate with Testing Solution 11 to a blue-green endpoint. The Free Acid will generally be between 2.0 – 4.0 for a 10 point Total Acid bath. To lower the Free Acid one point add 10 lbs. each of NEUTRALIZER 3 and FREIDOX 3 for each 1000 gallons of working solution.

FORMCOAT 7A is 12.2 lbs./gal. sp.gr. 1.452

FORMCOAT 7B is 11.8 lbs./gal. sp.gr. 1.415

 

Additional Information

Temp Range

125-135

Substrate

Aluminum

Applications

Stamping, Extrusion

Product Type

Conversion Coatings

Product Line

Formcoat

Method

Immersion

Ordering Information

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