Lightweight Manganese Phosphate Coating - Freiborne Industries, Inc Lightweight Manganese Phosphate Coating - Freiborne Industries, Inc

Product Families: , Freibornite MP
   

Manganese phosphate coating process designed to reduce wear on bearing surfaces and retard corrosion of these parts. Resultant phosphate coating will have a more refined crystal structure and will be lighter than with Freibornite MIP.

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FREIBORNITE MP is a manganese phosphate coating process for ferrous alloys designed to reduce wear on bearing surfaces and retard corrosion of these parts. FREIBORNITE MP produces lighter and tighter grained phosphate coatings than FREIBORNITE MIP and operates at lower temperatures.

• The process tank should be constructed from stainless steel or an acid and oxidizer resistant
composite material that will withstand the temperature ranges required. Use of mild steel will result in shortened equipment life due to chemical attack.

• Heat transfer surfaces should be constructed of 316 stainless steel, or an acid and oxidizer resistant high temperature composite, if steam or heat transfer fluid type heat exchangers are used.

• Piping and pumps may be constructed of stainless steel, mild steel, or an appropriate composite material. Use of mild steel will result in shortened equipment life.

• For each 1000 gallons of working solution required:
• Fill the process tank to ¾ of the working volume with water
• Add 80 gallons (900lbs) of FREIBORNITE MP
• Add 40 pounds of NEUTRALIZER 4
• Add water to bring the solution up to the working volume
• Heat to the operating temperature (once the optimal operating temperature has been determined it
should be maintained within +/- 50F)
• Just prior to processing any work through the solution add 1.1 Liters (0.30 gal) of FREIDOX 2 and mix the solution

The typical treatment process for FREIBORNITE MP is as follows:
1. Cleaning with a mild FREICLEAN series cleaner
2. Warm water rinse
3. Cold water rinse
4. CONDITIONER 6 (Optional)
5. FREIBORNITE MP
6. Cold water rinse
7. Hot NEUTRALIZER rinse
8. FREIBORNE OIL to prevent corrosion

To maintain the bath’s performance it should be regularly tested and adjusted to within
operating parameters. Normal processing time with FREIBORNITE MP is 10 minutes.
Processing parameters can vary widely based on individual processes and performance
requirements. Typical operating parameters are listed below. Your Freiborne representative will help develop the proper operating parameters for your specific needs.

Insoluble phosphate sludge will be generated as a natural byproduct of the FREIBORNITE MP reaction with the steel. This sludge must be periodically removed to prevent it from depositing on the surface of the steel being coated, as it is abrasive in nature and can have a deleterious effect on subsequent performance of the coated parts. If sludge deposition is a continual problem an approved rinse aid may be used to help alleviate the issue.

Maintaining the temperature of the rinse prior to FREIBORNITE MP as close to the temperature of the FREIBORNITE MP as possible will reduce both chemical consumption and sludge generation.

If the FREIBORNITE MP phosphating solution is continually heated when not in used excess free acid may be generated. To avoid this situation the tank temperature should be lowered during long periods of inactivity.

Treated parts must be free from oils, soils, and oxides in order to receive an effective and uniform coating. Any contaminants or oxides on the part surface will prevent a proper reaction between the phosphate and part.

Testing and control of a FREIBORNITE MP bath is based on Total Acid, Free Acid, and Accelerator according to the following:

Total Acid: Using a 2ml volumetric pipette, transfer a 2ml sample of the FREIBORNITE MP into a clean 250ml Erlenmeyer flask (adding up to 50ml of DI water to the flask may aid in viewing the endpoint). Add 5 drops of Indicating Solution 3 (Phenolphthalein) and titrate with Testing Solution 11 (0.1 N NaOH) to a slight pink endpoint. Record the
buret reading as the Total Acid (1.0 ml Testing Solution 11 = 1.0 total acid points).

Free Acid: Using a 2ml volumetric pipette, transfer a 2ml sample of the FREIBORNITE MP into a clean 250ml Erlenmeyer flask (adding up to 50ml of DI water to the flask may aid in viewing the endpoint). Add 5 drops of Indicating Solution 11 (Bromophenol Blue)
and titrate with Testing Solution 11 (0.1 N NaOH) to a blue-green endpoint. Record
the buret reading as the Free Acid (1.0 ml Testing Solution 11 = 1.0 free acid
points).

Accelerator: Before performing the titration dip a strip of Indicating Paper 17 into the tank. If the paper stays white continue with the titration. If the paper turns pink the bath is on the iron side and small additions of FREIDOX 2 should be made until all of the iron has been removed and the Indicating Paper 17 remains white. Using a 25ml
volumetric pipette, transfer a 25ml sample of the FREIBORNITE MP into a clean
250ml Erlenmeyer flask. Add 15 drops of Testing Solution 44 (50% H2SO4) and
titrate with Testing Solution 15 (0.042N KMnO4) to a persistent pink that lasts for
more than 10 seconds. Record the buret reading as the Accelerator points (1.0 ml
Testing Solution 15 = 1.0 accelerator points).

Adjustments:

Total Acid: To increase Total Acid by one point (1.0 ml) add 8 gallons (90 lbs) of
FREIBORNITE MP per 1000 gallons of working solution.

Free Acid: If Free Acid is high, Neutralize to correct range with NEUTRALIZER 4. An addition of 2.5 lbs NEUTRALIZER 4 per 1000 gallons will drop the Free Acid by 0.1 points.

Accelerator: Addition of 25 ounces (0.2 gal or 750mls) of FREIDOX 2 per 1000 gallons will increase the accelerator concentration by 0.1 point. If the solution has not been
worked for a period it should be checked with Indicating Paper 17 to ensure it is still operating on the nitrite side. If the paper turns pink it is iron and must be brought back with FREIDOX 2 additions before further processing.

 

Additional Information

Temp Range

165-180

Substrate

Carbon Steel

Applications

Protection, Wear resistance

Product Type

Conversion Coatings

Product Line

Freibornite

Method

Immersion

Ordering Information

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