SEVEN TANK PROCESS CHEMICAL
- The Seven Tank Process is a standard chemical treatment procedure used to prepare metal surfaces (often steel) before processes like powder coating, painting, or other finishing applications. This process involves seven sequential chemical tanks, each containing different chemicals for various stages of cleaning, degreasing, and conditioning the metal surface to ensure it is clean, smooth, and ready for coating or finishing.
- Here’s a breakdown of the Seven Tank Process and its functions:
1. Alkaline Degreasing Tank:
- Purpose: Removes grease, oil, and other contaminants from the metal surface.
- Chemicals Used: Alkaline degreaser (often a caustic solution) that emulsifies and removes oils and dirt.
2. Water Rinse Tank 1:
- Purpose: Rinses off the degreaser and contaminants removed during the first stage.
- Chemicals Used: Clean water to ensure thorough removal of the degreasing solution.
3. Acid Pickling Tank:
- Purpose: Removes rust, mill scale, and other oxides from the metal surface.
- Chemicals Used: Usually contains hydrochloric or sulfuric acid to effectively clean the surface.
4. Water Rinse Tank 2:
- Purpose: Rinses off any remaining acid residues from the pickling process.
- Chemicals Used: Clean water to ensure complete removal of acidic chemicals.
5. Phosphating Tank:
- Purpose: Applies a phosphate coating on the metal surface, which helps with corrosion resistance and provides a good base for paint adhesion.
- Chemicals Used: Phosphating chemicals, such as zinc or manganese phosphate solutions, depending on the application.
6. Water Rinse Tank 3:
- Purpose: Removes excess phosphate solution from the surface.
- Chemicals Used: Clean water to thoroughly rinse the phosphated metal surface.
7. Passivation / Chromating / Sealing Tank:
- Purpose: This stage applies a final passivation or sealing layer, enhancing corrosion resistance and sealing the phosphate coating.
- Chemicals Used: Often includes chromates or sealants designed for the particular metal and coating needs.
Keywords
good base
mill scale
first stage
Clean water
other oxides
Sealing Tank
coating needs
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sulfuric acid
paint adhesion
various stages
metal surfaces
acidic chemicals
complete removal
thorough removal
particular metal
caustic solution
Phosphating Tank
pickling process
Water Rinse Tank
final passivation
phosphate coating
other contaminants
Alkaline degreaser
Acid Pickling Tank
different chemicals
degreasing solution
corrosion resistance
Phosphating chemicals
The Seven Tank Process
remaining acid residues
phosphated metal surface
Alkaline Degreasing Tank
excess phosphate solution
SEVEN TANK PROCESS CHEMICAL
other finishing applications
manganese phosphate solutions
seven sequential chemical tanks
standard chemical treatment procedure
