. What is the 7-Tank Process?
- The 7-tank process is a surface pretreatment system used before powder coating or painting to ensure proper adhesion and corrosion resistance.
It typically includes:
1. Degreasing
2. Water Rinse – 1
3. Derusting / Pickling
4. Water Rinse – 2
5. Phosphating + Accelator powder
6. Water Rinse – 3
7. Passivation.
* What chemicals are required for the 7-Tank process?
- The common chemicals include:
- Alkaline Degreaser – For oil and grease removal
- Derusting Chemical – Usually phosphoric acid-based
- Activation Agent (optional) – To promote uniform phosphate coating
- Phosphating Chemical (Iron / Zinc / Trication) – For corrosion protection
- Passivation Chemical (Chromate / Non-chrome) – For final sealing. # 7-Tank Process chemical manufacturer.
