Product description

Teja phos-300 is an accelerated Zinc Phosphating process, which is specially formulated to produce medium to heavy weight coating on Iron and Steel surfaces by Hot Immersion method. Teja phos -300 is recommended for a wide range of ferrous metal articles such  as car accessories, metal cores, forge and cast iron components, small weight coating gives a very good finishing. Manufacturers who use hot dipped / electro galvanized components will find Teja Phos -300 very useful. Giving Zinc-Nickel Phosphate Coating.

Product Specifications

Colour

Light Green 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

3.5 litres to 5 litres of Teja phos -300 for 100 litres of bath.

Temperature

60 - 70°C

Immersion  
a. For medium weight coating 
b. For heavy weight coating

5 –10 minutes
20-40 minutes

Product Operating Procedure

The articles to be processed in the Teja phos -300 solution should be free from oils, greases, dirts, rust and scales etc.

Derusting

Remove rust and scales present on the articles to be processed by immersion in Teja Derusting chemical. If scales are heavy the article should be immersed in Teja Deruster- MA. After pickling rinsing should be carried out thoroughly. If possible in two stages.

Phosphating

Immerse the components in Teja phos -300 bath for 5 to 40 minutes at 60-70 dg.             
temperature. Immersion time depends on the type of coating weight required. Medium weight coating can be produced by immersion for 5 – 10 minutes which serves a good base for under gloss pains heavier coatings with Teja phos -300 can be obtained by Immersion for 20 -40 minutes which increase corrosion resistance. Rinse the phosphated articles in cold running water followed by hot water rinse to accelerate drying.

Passivation

Articles should be passivated by immersion in Hot Tejapassivation 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.

Fill the tank 2/3 with water and add 2.5 to 5 liters of Teja phos -300 per 100 litres. Fill the bath upto its operating level and stir the solution thoroughly. 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 (Teja phos -300). Heat the bath to the operating temperature Teja phos -300 bath can be easily controlled within the operating temperature. Teja phos -300 bath can be easily controlled within the operating limits by simple titration and maintained by periodic additions of Teja phos -300.

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

Teja phos -300 tank should be fabricated with 3 to 4 mm thick M.S. Plates with continuous convection current heating 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 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 Teja phos -300 per 100 lits of bath for each pointage below 30.

Safety Measures

Tejaphos-300 is an acidic liquid material, and while handling proper care should be taken. Protect eyes and skin by means of goggles, aprons, gloves and face shield etc. When it comes into contact with skin and eyes, wash thoroughly with a flush of water and get medical advice. For more information please see our Material Handling and Safety Data Sheet No.2.

General Information
Corrosion Resistance: Excellent.