The 7 Tank Process for powder coating on metal is composed of the following steps: Degrease Rinse Pickling Rinse Phosphating Rinse and Passivation In some cases, we use Activator before Phosphating Also known as the zinc phosphating process. M. Chem. Chemicals provide a wide range of Pretreatment Chemicals for the 7-tank process of powder coating on metal.

The procedures that we must adhere to for the Seven Tank Process of Powder Coating Metal are as follows:

1)Degreasing in 7 Tank

The 7 Tank Process for powder coating on metal requires the removal of oil, grease, and soil. To do this, we provide M.CHEM .D.G. Series of both alkaline and acidic degreasers, which are usually used in hot conditions. Acidic degreasers are acidic liquids that work best in cold conditions, but are more expensive than alkaline degreasers

Solution Strength:The solution strength of the degreaser would be 5-7 kg per 100l of soft water.

Duration: The duration of the process is 20-40 minutes

Temp.: It works best in high temperatures of 75-80 degrees Celsius.

2)Rinsing

Rinse with water in the second tank of the seven-tank process after degreasing. The purpose of the water wash is to eliminate the degreasing effect from the metal surface. It stops chemicals from going through other steps. Make sure it has been well rinsed before moving on to the next step.

3)Derusting in Seven Tank

After washing the metal surface with water, proceed to de-rusting. Submerge the object in the de-rusting chemical solution-filled third tank of the seven-tank powder coating process. To do this, make use of pickling and acidic de-rusting chemicals to remove oxide layers, rust, and scale from all surfaces. The most effective de-rusting solution is provided by the M. Chem R.R. series of chemicals.

Solution Strength: To make the rust remover solution workable from ambient temperature to a maximum of 60 degrees Celsius, mix 25 litres of the remover with 75 litres of soft water.

To make the rust remover solution workable between 45 and 60 degrees Celsius, mix 10 to 12 litres of the remover with 90 litres of soft water.

Duration: 15- 20 minutes

Temp.: Ambient temp to max 60 C

4)Rinsing

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 7 Tank Process

Next step in 7 Tank Process for Powder Coating is Surface Activation. This step is optional.     Surface activation chemicals activate the metal to get a fine crystalline structure during phosphate coating. This will increase corrosion resistance and adhesion properties. Generally, a crystalline structure of under  10 microns is recommendable. Mahavir Chemicals offers M. Chem. S.M. Series for Activator. Acidic, as well as new Alkaline Activator compounds, produce a compact 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 7 Tank Process

Phosphating Process is the most important process of 7 Tank Process for Powder Coating. In general, we call 7 Tank Process as Phosphating Process. For Phosphating to Metal, we prepare Zinc Phosphate Solution using M. Chem. L. P. Series of chemical for Phosphating. Zinc Phosphate solution makes the coating of sheet metal surface smooth and uniform.  Zinc Phosphate Coating is grey in nature.  M. Chem. L. P. Series of chemical for Phosphating gives the best result in 7 Tank Phosphating Process.

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)Passivation in 7 Tank Process

Now, the last step in the 7 Tank Process for Powder Coating is to Passivate the Metal. The passivation forms a layer of chrome over the zinc phosphate. It increases the corrosion resistance protection of the metal parts. It seals the pores of sheet metal surfaces to obtain maximum corrosion resistance over phosphate coating.

Strength:  Again, Fill the tank with two-thirds of its capacity with soft water. For Passivation, Add M. Chem Passi. Series of chemicals for bath solution of 1000 liters. Raise the bath temperature. Top up the Tank with soft water.

Duration: Time may vary depending on the temperature of the bath.

Temp.:75+/- 5 C. It works both in High and Low temperatures.

4)Rinsing

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 7 Tank Process

Next step in 7 Tank Process for Powder Coating is Surface Activation. This step is optional.     Surface activation chemicals activate the metal to get a fine crystalline structure during phosphate coating. This will increase corrosion resistance and adhesion properties. Generally, a crystalline structure of under  10 microns is recommendable. Mahavir Chemicals offers M. Chem. S.M. Series for Activator. Acidic, as well as new Alkaline Activator compounds, produce a compact 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 7 Tank Process

Phosphating Process is the most important process of 7 Tank Process for Powder Coating. In general, we call 7 Tank Process as Phosphating Process. For Phosphating to Metal, we prepare Zinc Phosphate Solution using M. Chem. L. P. Series of chemical for Phosphating. Zinc Phosphate solution makes the coating of sheet metal surface smooth and uniform.  Zinc Phosphate Coating is grey in nature.  M. Chem. L. P. Series of chemical for Phosphating gives the best result in 7 Tank Phosphating Process.

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)Passivation in 7 Tank Process

Now, the last step in the 7 Tank Process for Powder Coating is to Passivate the Metal. The passivation forms a layer of chrome over the zinc phosphate. It increases the corrosion resistance protection of the metal parts. It seals the pores of sheet metal surfaces to obtain maximum corrosion resistance over phosphate coating.

Strength:  Again, Fill the tank with two-thirds of its capacity with soft water. For Passivation, Add M. Chem Passi. Series of chemicals for bath solution of 1000 liters. Raise the bath temperature. Top up the Tank with soft water.

Duration: Time may vary depending on the temperature of the bath.

Temp.:75+/- 5 C. It works both in High and Low temperatures.