Kemphos-329 (M)
(Accelerator Heavy Zinc Phosphating Chemical for Barreling Process)

Product Description
Kemphos-329(M) is an accelerated Zinc Phosphating chemical suitable for barreling process, which is specially formulated to produce medium to heavy weight coatings on Iron and steel surface by hot barreling process. Kemphos-329(M) is recommended for a wide range of ferrous metal articles such as car accessories, metal cores, forge and cast iron components, small components parts such as nut, bolts etc. Kemphos-329(M) protects iron and steel surfaces from rusting medium weight coating a very good foundation for paint system and protects under film corrosion, Heavy weight coatings.

This barreling process will yield a coating of 7.5 gm. Per square meter and above.

Product Specifications

Product Operating Data

Product Operating Procedure
The articles to be processed in the Kemphos-329(M) solution be free from oils, greases, dirts, rust and scales etc.

Degreasing
Remove all oils and greases by Emulsion cleaning, or Trichloroethylene vapour degreasing or by solvent wiping. Through rinsing should be followed. Wherever necessary after degreasing.

Derusting
Remove rust and scales present on the articles to be processed by immersion in Kemklin HD. If scale are heavy the articles should beyond by shot blasting or by pickling. After pickling rinsing should be carried out in two stages.

Phosphating
Load the barrel with ferrous components in Kemphos-329(M) bath. The chemical bath parameters should be maintained as per product operating data given in the TDS. The loaded barrel should be lowered in the chemical bath and run it for 5 to 40 minutes 80-85°C temperature, depending upon the type of coating weight required. Medium coating weight can be produced by running the barrel for 5 – 15 minutes. For heavier coatings, the barreling time can be increased upto 40 minutes which serves a good base for excellent corrosion resistance. Rinse the phosphate articles in cold running water followed by hot water rinse to accelerate drying.

Passivation
Articles should be persisted by immersion in Hot Kemlyte-333 solution at 70° C for 30 seconds to 1 minute.

Drying
After passivation the articles should be dried immediately drying can be done inside a hot air circulating oven or by means of compressed air.

Heat the bath to 70 C and add few kgs. Of degreased iron scrap or steel wool. After 15-20 minutes when the gassing has been ceased, remove the metal and check iron percentage. Ferrous Iron concentration should be 0.05% minimum. Otherwise repeat the operation.

Adjust the pointage of bath to working condition by adding Kemphos-329(M). Heat the bath to the operating temperature Kemphos-329(M) bath can be easily controlled within the operating limits by simple titration and maintained by periodic additions of Kemphos-329(M).

Phosphate coating alone do not protect the rusting for long period and required sealing with paint, stain or oil immediately after coating which provides long term protection.

Product Application Equipment
Kemphos-329(M) tank should be fabricated with 3 to 4 mm thick M.S. Plates with continuous convection current hating system.

Testing and Control Procedure:

Total Acidity
Pipette out 10 ml. Of the bath solution in a clean 100 ml beaker or conical flask and 2 to 3 drops of indicator Phenolphthalein and titrate against N/10 NaOH solution to a pink end point. The number of Mis required represent the total acid pointage. Bath pointage should be maintained between 28 to 32 ml. Add 125 ml. Of Kemphos-329 per 100 lits of bath for each pointage below 30.

Ferrous Ion Concentration
Pipette 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 persisting for 15 seconds. Multiply by the titration reading with 0.056, we get percentage of iron in the bath.

Chemical Replenishment
Restore the bath to the working level by adding water to makeup evaporation loss and drag out losses. Check the Kemphos-329(M) poundage. Add 125 ml Kemphos-329(M) per 100 ltr bath for increasing pointage by one unit.

Safety Measures
Kemphose-329(M) is an acidic liquid material, and while handling proper care should be taken. Protect eyes and skin by means of goggles, aprons, gloves, etc. It comes in contact with skin and eyes, wash thoroughly with a flush of water and get medical advice.

General Information
Corrosion Resistance: Excellent.