Product description

Tejaphos - 003 Forms calcium modified zinc phosphate coating on ferrous and non-ferrous surfaces and hence is widely recommended for automobile, refrigerators, furniture, air conditioners, electrical industries where single coat of gloss paint required. Tejaphos - 003 is an accelerated warm Zinc Phosphating process, which is specially formulated to produce fine    and smooth coating on steel and non-ferrous 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 prevents spread of rust even after the damage of paint film. Thus, it prevents blistering of the paint film.

Product Specifications

Colour

Off White Liquid

Odour

Slightly Pungent

Foaming Tendency

Nil

Reliability

Good

Handling

Avoid Skin Contact

Solubility

Good

pH

Acidic Range

Toxicity

Acidic

Flash Point

Nil

Pollution Hazard

Treatable

Product Operating Data

Concentration                   

3 to 5 litres for 100 litres of bath

Temperature

60 – 70 °C

Dip Duration

3 – 5 Minutes

Accelerator

250ml/100 litres of bath. If operated below 70oC

Accelerator Pointage

2 - 6ml

Product Operating Procedure

The complete process for the application of Tejaphos - 003 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 Given
Determining the working volume of the tank

Fill the tank with 2/3 of desired quantity of water and heat it about 50°C. Add Tejaphos - 003 at 3 – 5%v/v in to the Bath and stir it well by rising the water to its operating level and rise the temperature to 60 – 70°C. Add 250 ml. of accelerator 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 Equipment

Tejaphos - 003 tank should be fabricated with 3 to 4 mm thick M.S. (or Preferably SS 316) Plates with continuous current heating system.

Testing and Control Procedure:

Total Acidity

Pipette 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 Tejaphos - 003 to the bath for each one pointage less add 125 ml. Of Teja activator per 100 litres of bath.

Accelerator (Tejaactivator) test by starch Iodide Paper

Check the bath temperature. Dip a piece of starch Iodide paper in the bath. After some seconds the colour will Indicate the concentration of the bath.

Tejaactivator (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 Tejaphos - 003.

Titration Test for (Teja Activator) Concentration

Pipette out 50 ml. Bath solution into flask. Add 5 ml of concentrated H2SO4 and mix it well. Titrate against 0.1N. KmnO4 solution to a pink colour which persists for few seconds.

Note, the number of ml. of 0.1N KmnO4 added in the (Teja Activator) concentration. Normal limit forTejaactivator) 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 (Teja Aactivator) pointage by 1 ml.

Ferrous Iron 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 point persisting for 15 seconds. Multiply by the titration reading with 0.56, we get percentage of Ions in the bath.

Chemical Replenishment

Since there is continuous sludge generation in phosphating bath due to phosphating of ferrous metal surface, the bath should be desludged periodically and chemical concentration should be replenished by adding chemical to achieve specified bath pointage.

Safety Measures

Teja Activator is an acidic liquid material, and while handling proper care should be taken. Protect eye, skin by means of goggles, gloves, face shield etc. If it comes in contact with skin and eyes wash thoroughly with flush off water and get medical advice. For further Information please refer our Material Handling and Personal safety Data Sheet No.2.

General Information
Corrosion Resistance: Good
Paint Adhesion: Good
Gloss Retention: Good.