8 Tank Phosphating Process For Powder Coating - Metal Pretreatment
Our 8 Tank Phosphating Process Chemicals which includes Degreasing chemical, Phosphating Chemical etc. are safe and Biodegradable.
Our 8 Tank Process chemicals are ready to use for metal surface pretreatment.In addition, we provide free consultation for setting up the 8 Tank Process plant.This helps you achieve a smooth setup and consistent coating quality.
we provide expert guidance and complete support to ensure a smooth and successful setup of the plant
What is 8 Tank Phosphating Process Steps for Powder Coating on Metal ?
8 Tank Phosphating Process is necessary for smooth Powder Coating. It is also necessary to increase corrosion resistsnce.Following are the steps of 8 Tank Process for Powder Coating on Metal Surface.
- Degreasing
- Rinsing
- Derusting
- Rinsing
- Surface Activation
- Phosphating
- Passivation
- Rinsing
1)Degreasing in 8 Tank Phosphating Process : .
Very First step in 8 Tank Process of Powder Coating is to eliminate oil, grease and soil from the metal surface. Both Alkaline and Acidic degreaser are useful for process of degreasing in 8 Tank Process. Alkaline degreaser is a mixture of alkalies and Surfactant. Generally, Hot condition is preferable for Alkaline Degreaser. However, Acidic Degreaser are solvent based liquids. Acidic Degreaser are acidic in nature. It is useful in removing rust and grease under cold condition. But it is expensive as compared to alkaline degreaser.
Solution Strength: Dissolve 5-7 kg of M. Chem D.G. Series of degreaser in 100 litres of soft water.
Duration: 20-40 minutes
Temp.: Degreaser works generally in high temperature in 75-80 c
2)Rinsing in 8 Tank Process : .
Once Degreasing process is complete, the next step is to rinse. Next rinse with water in the 2nd Tank of 8 Tank Phosphating Process. Water wash will wipe off the effect of degreasing from the metal surface. It stops chemicals to go on further process. Make sure before going to next step Metal must be rinsed properly.
3)Derusting in 8 Tank Phosphating Process : .
After cleaning the Metal with water, next step is De-rusting. Derusting Process removes the rust from the metal. For that, fill de-rusting chemicals solutionsin the 3rd Tank and Immerse the item in the 3rd Tank of 7 Tank Process for Powder Coating. In the 3rd Tank use Acidic de-rusting and Pickling Chemicals to remove rust, scale and oxide layer etc. from all surface.
Solution Strength: Mix 25 liters of rust remover with 75 liters of soft water to make the solution of rust remover workable from Ambient temp to max 60 c.
Mix 10-12 liters of rust remover with 90 liters of soft water to make the solution of rust remover workable from 45 c to max 60 c.
Duration: 15- 20 minutes
Temp.: Ambient temp to max 60 C
4)Rinsing in Phosphating Process : .
Rinse with water once again in the fourth tank of the powder coating process’ seven tanks.The fourth water wash tank eliminates the chemical de-rusting agent’s effect on metal surfaces. Because the de-rusting chemicals are acidic by nature, this prevents them from working any further. Thus, ensure that a thorough water rinse has taken place before proceeding to tank 5.
Maintain PH of water to 7 PH Scale.
5)Surface Activation in 8 Tank Process : .
Another step in 8 Tank Process of Phosphating is Surface Activation. This optional step one may skip in 7 tank Process. But Activation step will increase corrosion resistance and adhesion properties. Surface activation chemicals activate the metal to have fine crystalline structure during phosphate coating process. Generally, this crystalline structure less than 10 microns are more desirable. Acidic and also new Alkaline Activator compound generate a packed crystal structure of phosphate coating.
Strength: PH and Alkalinity are to be maintained.
Duration: 20 minutes
Temp.: This works at Room Temperature.
6) Phosphating in 8 Tank Process : .
Phosphating Process is the most significant process of 8Tank Process of phosphating for Powder Coating. In general, we call 8 Tank Process for Powder Coating as Phosphating Process. For Phosphating process, we use Zinc Phosphate Solution. Zinc Phosphate solution keeps the coating of sheet metal surface smooth and consistent .
Strength: Fill the tank with 2/3 rd of its capacity with soft water. Add M. Chem L.P. Series of chemicals for bath solution of 1000 liters. Raise the bath temperature to minimum 50-60 C. Add toner crystals. Top up Tank with soft water and raise the temperature.
Duration: 5-20 minutes. Time may vary depending upon the temperature of bath and thickness of powder coating required.
Temp.: It works at 50-60 C.
7) Rinsing : .
Again, Rinse with water in the 7th Tank of 8 Tank Process of Powder Coating. 7th Tank of water clear the effect of phosphating chemicals on metal surface. Check it properly that phosphating chemical is not there on the metal.
8)Passivation in 8 Tank Process : .
Now, the Final step in 8 Tank Phosphating Process for Powder Coating is to Passivate the Metal. Passivation make a chrome layer over the Zinc Phosphate. It is useful in increasing the corrosion resistance protection of the metal parts. It enclose the pores of sheet metal surface and thereby obtains maximum corrosion resistance over phosphate coating.
Strength: Fill the tank with 2/3rd of its capacity with soft water. Add M. Chem Passi. Series of chemicals for bath solution of 1000 liters. Raise the bath temperature. Top up Tank with soft water.
Duration: Time may vary depending upon the temperature of bath.
Temp.:75+/- 5 C. It works both in High and Low temperature.
