FREIBOND D-18 is a low temperature cleaner/coater iron phosphate process designed primarily for spray application. It is an excellent base for paint on steel surfaces.
Low temperature cleaner/coater iron phosphate process designed primarily for spray application. Works well on light soils.
- testing and control
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Stainless steel, mild steel, and high temperature acid resistant plastics are suitable for processing equipment. Full cone spray nozzles, such as Spraying Systems WhirlJet® nozzles, are normally used in spray applications to ensure uniform application of FREIBOND D-18. Spray pressures should be maintained between 15 and 20 psig. Spray pressure above 20 psig will create inconsistencies and voids in the iron phosphate coating.
To charge the tank, fill to the 3/4 level with water and for each 1000 gallons of working solution, add 400 lbs. of FREIBOND D-18 chemical and 10 lbs. of NEUTRALIZER 1. Bring to working level with water and mix thoroughly, then heat to 80o-135°CF. Spray times are usually from 45 – 90 seconds.
An appropriate FREICLEAN product, followed by a rinse stage, should precede FREIBOND D-18 phosphating application. The rinse stage ahead of the FREIBOND D-18 can be adjusted with ADDITIVE 37P, at 0.5 to 2.0 points of total acid, to prevent alkaline cleaner drag-in and prepare the substrate for phosphating.
To maintain the bath’s performance it should be regularly tested and adjusted to within operating parameters. Normal processing time with Freibond D-18 is 60 seconds but processing times often range from 30 to 120 seconds. 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.
The pH value can be run on the negative, or free acid, side when numerous welds or laser cutting oxides are present. Consult your Freiborne representative to determine what are the optimum operating parameters for your particular situation.
The Freibond D-18 treatment is typically followed by a rinse stage and a chrome free final seal rinse such as FREICON 33 or FREICON RSX.
Control is based on Total Acid with pH adjustment.
Total Acid Test:
Pipet a 10 ml sample into a suitable beaker or Erlenmeyer flask and add 4 drops of Indicating Solution 14 (thymolphthalein). Titrate with Testing Solution 11 (0.1N NaOH) to a permanent faint blue endpoint. Addition of 30 lbs (3.0 gallons) of Freibond D-18 per 1000 gallons will raise the Total Acid by 1 point.
Pipet a 10 ml sample into a suitable beaker or Erlenmeyer flask and add 4 drops of Indicating Solution 2 (Bromcresol green). If the sample turns blue titrate with Testing Solution 20 (0.1NH2SO4) from blue to green. If the sample turns green or yellow, a negative pH adjustment value is indicated. Titrate with Testing Solution 11 to a blue color.
Use ADDITIVE 37P to adjust the pH value down if the Total Acid is within normal operating parameters. Use Freibond D-18 to adjust the pH value if the Total Acid is below the normal operating parameters. To lower the pH adjustment by 0.1 points, add 4 lbs of FREIBOND D-18 or 190 mls of Additive 37P per 1000 gallons of solution.
To raise the pH adjustment by 0.1 points, add 7 oz of NEUTRALIZER 1 or 450mls of NEUTRALIZER 35 per 1000 gallons of working solution.
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