Spray type surface treatment lines are automatic cleaning systems that operate on the high-pressure spraying principle for pre-paint surface preparation of metal parts. These lines apply degreasing, rinsing, phosphating and passivation processes by spraying onto parts moving on the conveyor system. Acrotech spray type systems provide homogeneous coating on both internal and external surfaces of complex geometry parts and are widely used in automotive, white goods and machinery manufacturing sectors.
In spray type systems, as parts advance on the conveyor line, specially designed spray nozzles spray chemical solution or rinsing water at high pressure (1.5-2.0 bar) at each process stage. This mechanical action, in addition to chemical cleaning, also provides physical cleaning, accelerating the removal of oil, rust and dirt from the part surface. The system consists of alkaline or neutral degreasing, multi-stage rinsing, iron/zinc phosphating, passivation and final rinsing stages.
Throughout the process, temperature (55-65°C), chemical concentration and pH values (between 4-6) are monitored and kept constant by automatic control systems. Spray pressure is adjusted according to part geometry: low pressure results in poor coating, while high pressure risks dusty surface formation.
BONDERITE® M-NT NT-1 is a phosphate-free reactive conversion coating specially developed for steel, zinc and aluminum surfaces. Designed as an alternative to conventional phosphate applications, this system is more environmentally sustainable. It is optimized to improve adhesion and corrosion resistance of painted metal surfaces and is compatible with all types of paint applications.
The effectiveness of these surface treatments depends on various factors such as previous cleaning or etching stages (BONDERITE C portfolio), line design or process parameters. The system is preferred by companies targeting energy efficiency and low chemical consumption in modern production facilities.
Iron phosphate application forms a thin crystal layer on metal surfaces before electrostatic powder or wet paint to increase paint adhesion and provide corrosion protection. Since spray pressure is utilized in addition to chemical power, concentration and temperature, it is 5 times faster than dip-type phosphate applications. Processing time ranges from 2-5 minutes.
Spray zinc phosphate systems represent the most modern pre-paint phosphating method in today's technologies. Zinc phosphate forms a thicker coating layer than iron phosphate and provides higher corrosion resistance. Despite higher initial investment cost, it is preferred by automotive and heavy industry sectors due to coating quality, processing speed and lower chemical consumption.
| Process Temperature | 55-65°C (phosphating stage) |
| Processing Time | 2-5 minutes (total line time) |
| Spray Pressure | 1.5-2.0 bar |
| pH Range | 4-6 (phosphate bath) |
| Phosphate Type | Iron Phosphate / Zinc Phosphate / Nano-Phosphate |
| Automation | PLC control, automatic dosing system |
| Conveyor Type | Overhead conveyor / Chain conveyor |
| Heating System | Electric / Natural Gas / Steam |
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