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.
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.
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
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