Kemphos - 325 (Light Zinc Calcium Phosphating Chem

                                                                                           Calcium Zinc Phosphating Chemicals Product descriptionWe offers our customers Light Zinc Calcium Phosphating Chemical. Kemphos-325 is widely recommended for automobile, refrigerators, furniture, air conditioners, electrical industries where single coat of gloss paint required. Kemphos-325 is an accelerated warm Zinc Phosphating process, which is specially formulated to produce fine and smooth coating on steel and zinc surfaces. Smooth coating serves as a good base for paint and reduces consumption of paint and retains paint gloss. Fine micro crystals of phosphating coating increase paint life and presents spread of rust even after the damage of paint film. Thus, it prevents blistering of the paint film Product Specifications   a. Colour Light Pale Yellow Liquid b. Chemical Composition Blend of Phosphates, Nitrates, Zinc, Activators, etc. c. Odour Slightly Pungent d. Foaming Tendency Nil e. Reliability Good f. Handling Avoid Skin Contact g. Solubility Good h. pH Acidic Range I. Toxicity Nil j. Flash Point Nil k. Pollution Hazard Moderate  Product Operating Data   Concentration 3 to 5 litres for 100 litres of bath Total Acidity 18- 22 at 3% strength 35 at 5% strength Temperature 60 -70oC Accelerator 20 gms/100 litres of bath. If operated below 70oC Accelerator Pointage 2 - 6ml Acid RatioAcid ratio of the phosphating bath should be maintained as per the recommendation I.e. between 5- 7. Acid ratio is determined as follow: Acid Ratio: Total Acidity   (bath pointage)                   Free Acidity When Kemphos-325 bath operated accelerator (Kemphos-325) at a higher temperature , aging of the bath should be carried out with degreased steel wool. Product Operating ProcedureThe complete process for the application of Kemphos-325 solution by immersion normally consists of the following steps Degreasing Running water rinse Derusting/Descaling Running water rinse Surface Activation Phosphating Running water rinse Passivation Carryout the Following Operations in The Order GivenDetermination the working volume of the tank fill the tank with 2/3 of water and heat it about 50oC. Add Kemphos-325 at 3 - 5 ltr. Bath and stir it well. Raise the temperature to its operating temperature 60 -70oC and fill water to its operating level. Add 20 gms. of accelerator dissolving in water per 100 ltr. Bath. Now check the pointage of the bath solution and accelerator by Potassium starch Iodide paper. Before starting production the bath should matured and the colour of the solution will be milky white.Product Application EquipmentKemphos-325 tank should be fabricated with 3 to 4 mm thick M.S. Plates with continuous current hating system. Testing and Control Procedure: Total AcidityPipette out 10 ml. Of the solution in a conical flask. Ass few drops of indicator Phenolphthalein and shake it well. Titrate against N/10 NaOH until permanent pink colour persists. The number of ML of N/10 NaOH added is the pointage of the bath. Adjust the pointage by adding emphos-325 to the bath for each one pointage less add 125 ml. Of Kemphos-325 per 100 litres of bath. Accelerator (Kemphos-002) test by starch Iodide PaperCheck the bath temperature. Dip a piece of starch Iodide paper in the bath. After some seconds colour will Indicator the concentration of bath. Kemphos -002 (Accelerator) Starch Iodide Paper No Accelerator Remain White Insufficient Pale Mauve Optimum Blue to Dark Blue Excess Black It is essential to have correct amounts of accelerator,excess addition of accelerator in the bath causes sludge formation and wastage of Kemphos-325. Titration Test for (Accelerator - 002) ConcentrationPipette out 50 ml. Bath solution into flask. Add 5 ml of concentrated H2SO4 and mix it well. Titrate against O.I.N. KmnO4 solution to a pink colour which persist for few seconds. Note, the number of ml. of 0.1N KmnO4 added in the (Accelerator-002) concentration. Normal limit for accelerator-002) titration is 2-6 ml. Lower limit is preferable. Approximately 30 ml. Of 25% Accelerator-002 solution in water should be added to increase the (accelerator-002) pointage by 1 ml. Ferrous Iron ConcentrationPipette out 10 ml. Of bath solution in 150 ml. Conical flask. Add 2 ml or 50% H2SO4 and titrate with N/10 KmnO4 (3.16 gms/ltr.) solution to pink end point persisting for 15 seconds. Multiply by the titration reading with 0.056, we get percentage of Ions in the bath. Chemical ReplenishmentSince there is continuous sludge generation in phosphating bath due to phosphating of ferrous metal surface, the bath should desludged periodically and chemical concentration should be replenished by adding chemical to achieve specified bath pointage. Safety MeasuresKemphos-325 is an acidic liquid material, and while handling proper care should be taken. Protect eye, skin by means of goggles, gloves etc. It comes in contact with skin and eyes wash thoroughly with flush off water and get medical advice. General InformationCorrosion Resistance: GoodPaint Adhesion: GoodGloss Retention: Good.