February 25, 2022

Application of Nozzle in Spraying Pretreatment

Spray pretreatment applications involve cleaning, metal parts and coating equipment, which requires not only low-pressure flushing, but also high-pressure cleaning, cooling, and drying nozzles. Selecting the right nozzle becomes a top priority.

Plastic clip nozzle

Plastic clip-on nozzles use stainless steel clamps to quickly clamp plastic nozzles. It forms a multi-series by directly connecting the spherical nozzle or indirectly connecting the nozzle through a threaded ball and a quick-release ball to meet the needs of various applications. In the process of use, you can quickly and accurately adjust the spray direction of the nozzle, so that it is always in good working condition. In addition to its convenience, the clip-on nozzle is made of polypropylene, which can withstand high temperatures and high corrosion resistance, so clip-on quick-release plastic nozzles are ideal for spraying phosphates, acid solvents, or caustic alkali. choose. Many manufacturers use clip-on nozzles for phosphating, heat sealing, and cleaning metal parts as they pass through pretreatment tunnels.

Fan nozzle

During the flushing stage in a pretreatment system to remove residual cleaners and coating chemicals, the fan nozzle is a good choice because its impact assists in cleaning the nozzle. Because it can narrow the nozzle width in a small area (generally 15 to 65°) to produce impact-resistant surface cleaning effect. In other applications, jet nozzles with a spray angle of 0° are a good choice for cleaning metal parts in hard-to-reach areas.

If deionized water is required during the cleaning phase, a wide-angle deflection fan nozzle is sometimes used to preserve the fluid. Although the inner lobes of the wide-angle deflecting fan nozzles can potentially cause clogging, this is perfectly feasible as long as a filtered rinse is used in the cleaning.

Once the part has been pre-cleaned, it needs to be sprayed with a coating to create a more suitable finish, and this process requires that the coverage of the coating conversion nozzle must be uniform and complete, otherwise the surface cannot be cosmetically painted, and more easily corroded. Fan nozzles are often used in iron phosphide and chromium conversion coating systems. The lower impact force and large contact surface of the hollow cone nozzle make it more suitable for zinc phosphide systems.

Mixed flow nozzle

To enhance the chemical reaction between the coating and the metal substrate, iron and zinc phosphide are often applied in a supersaturated state, which requires agitation in the chemical tank to prevent metal debris from settling in the tank. Parts of the preconditioning system should not be completely dry. Improved circulation to help regulate liquid temperature and chemical balance in the tank is where the mixed flow nozzle comes into play. The use of this nozzle can improve flow and reduce sedimentation in the tank.

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