Dip type surface treatment lines are tank-based cleaning systems used for pre-paint surface preparation of metal parts. These lines operate on the principle of fully immersing parts in tanks containing chemical solutions and include degreasing, rinsing, phosphating and passivation stages. Acrotech dip type systems can be applied manually or automatically and deliver high quality in the cleaning of flat-surfaced parts, panels and large-dimension products.
In dip type surface treatment lines, parts are sequentially immersed in separate tanks representing each process stage. Parts are subjected to chemical treatment by being held in the tank for the specified duration (typically 5-15 minutes). The system can be operated manually or can be made fully automatic with overhead conveyors or robotic systems.
The immersion method ensures that all surfaces of the parts come into direct contact with the chemical solution. This feature makes it ideal for facilities working with flat-surfaced panels, sheets and profiles. Parts are processed through degreasing tanks, rinsing tanks, phosphating tanks, passivation tanks and final rinsing tanks to complete the surface preparation.
Acrotech dip type lines include the following process steps:
BONDERITE® Nano-Phosphate is a phosphate-free reactive conversion coating developed for steel, zinc and aluminium surfaces. It offers a more environmentally friendly alternative to traditional phosphate applications and is phosphate-free. Chromate, iron phosphate or zinc phosphate are among the most preferred surface treatment applications, and the Acrotech technical team recommends the most suitable option based on production conditions.
In dip type systems, iron phosphate and zinc phosphate applications are carried out by immersing parts in the tank for 5-15 minutes. Iron phosphate provides moderate corrosion protection, while zinc phosphate creates a thicker coating layer and is preferred for applications requiring high corrosion resistance.
The chromating process is applied for passivation purposes especially on zinc and aluminium surfaces. This process increases the stability of the crystal structure formed on the surface after phosphating and provides long-term corrosion protection.
Dip type surface treatment lines are widely used in the following industries:
| Processing Time | 5-15 minutes (per tank) |
| Total Line Time | 30-60 minutes (all stages) |
| Process Temperature | 50-70°C (degreasing and phosphating) |
| pH Range | 4-6 (phosphate bath), 11-13 (alkaline degreasing) |
| Phosphate Type | Iron Phosphate / Zinc Phosphate / Nano-Phosphate / Chromate |
| System Type | Manual / Semi-Automatic / Fully Automatic |
| Conveyor Type | Overhead conveyor / Elevator system / Manual basket |
| Heating System | Electric / Natural Gas / Steam |
Projects are prepared by the Acrotech technical project team with high precision, taking every detail into account. Surface treatment lines have many important technical details including heating type, heating capacity, water circulation system, vapour extraction system, and prevention of vapour and chemical mixing between tanks. They are preferred in facilities with lower capacity due to the lower investment cost compared to spray surface treatment lines, or due to very large and diverse part dimensions.
The cleaning stages include degreasing, rinsing and phosphating processes, similar to spray type surface treatment lines. However, processing times are longer compared to spray type lines. This time difference occurs because chemical reactions take place solely through the immersion method without mechanical action.
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