Iron Phos #2


Iron Phos #2 is a liquid concentrate for cleaning and phosphating iron and aluminum in one operation.  It is highly buffered to maintain pH in the 4.8 5.5 range. 


An amorphous iron phosphate coating is produced that will be gray to blue iridescent in color and have coating thickness of from 40 to 80 mg/sq foot. 


Iron Phos #2 is generally used in pressure spray washing machines, but can also be used in simple dip operations.  Selected wetting agents provide added cleaning strength.


Iron Phos #2 is a mildly acidic, clear liquid concentrate that mixes readily in water and is completely safe for workers to handle.  Fast acting surfactants speed cleaning of the metal surface and provide for a uniform coating finish.


EQUIPMENT: Only regular mild steel tanks and fittings are required.  Special expensive acid-resistant equipment is not needed with Iron Phos #2.


OPERATING CONDITIONS: Iron Phos #2 is designed for use in three-stage pressure spray washing machines and for best results should be used in this manner:


Iron Phos #2                             2 to 6% by volume in water 

Operating  temperature               140 to 160 oF. 

Time                                         30 seconds to 3 minutes. 

pH                                            4.8 - 5.5.


The second stage is a cold water rinse.  The third stage is a brief rinse in a seal rinse solution. Parts should be dried immediately following the third stage by conventional methods.


For immersion applications, if parts are heavily coated with soils, rust inhibitors or lubricants, then precleaning of the work should be performed to insure proper phosphating and to prevent against contamination of the iron phosphating solution. 


Make up of the operating solution


Iron Phos #2                                         4 to 6% by volume of in water

Operating temperature                            160 to 180o F. 

Time of immersion                                  2 to 5 minutes with agitation of the work or solution

pH                                                        4.8 to 5.5.


After treating, follow with conventional cold water rinse, then seal rinse and dry


MAINTENANCE AND CONTROL: During operating, the pH and concentration of the treating solution should be maintained through periodic additions of Iron Phos #2.  Maintain the pH of the solution between 4.8 and 5.5.  The concentration can be checked by simple titration:


1.       Add a 30 ml sample of Iron Phos #2 solution into a 250 ml beaker.

2.       Add 3 to 4 drops of phenolphthalein indicator.

3.       Titrate with 1.0N sodium hydroxide to a pink end point.


Calculation:  mls 1.0 N Sodium hydroxide x 1.1 = % by vol. Iron Phos #2.






1.       Add 3 mls of solution to be tested to empty dropper bottle, use a small graduated syringe.


2.       Add 2 drops of phenolphthalein indicator.


3.       Add 1.0N sodium hydroxide dropwise until permanent pink color change.  Swirl bottle gently between each drop addition.


4.       Use the number of drops of 1.0N sodium hydroxide to determine the concentration on the chart below.



DROPS OF 1.0 N SODIUM HYDROXIDE                                     % OF Iron Phos #2


                        3                                                                                  1


                        5                                                                                  2


                        7                                                                                  3


                        9                                                                                  4


                        11                                                                                 5


14                                                                                                                                                                 6



Read Material Safety Data Sheet before using this product.



The information presented herein, while not guaranteed, is to the best of our knowledge true and accurate.  No warranty or guarantee expressed or implied is made regarding the performance of any products, since the manner of use is beyond our control.  No suggestion for product use or anything contained herein, shall be construed as a recommendation for its use in infringement of any existing patent and we assume no responsibility or liability for operations which do infringe any such patents.  The above includes confidential and proprietary information of So Clean Solutions and is furnished to you for your use solely on products or processes supplied by us to you.


Product Date Sheets\PH039                                    Effective Date: 06-07-07                                         Supersedes: 1-2-03