Coating & Surface Treatment Nozzles

For phosphate baths and phosphate-rinse zones, use 316L stainless-steel flat-fan nozzles at 15–30 PSI with a 65°–95° spray angle. Phosphate chemistry is mildly acidic, so brass or carbon-steel bodies will pit within months. For long service life, choose a 316L body with a ceramic seat, the ceramic resists abrasion from the particulate that accumulates in recirculated phosphate solution. Size the GPM to your conveyor speed and manifold spacing so the curtain spray fully envelopes the part without dwell-time variation.

Automotive pre-treatment lines run a fixed sequence: alkaline clean → DI rinse → phosphate → DI rinse → seal → e-coat → DI rinse. Each stage uses different nozzle materials and patterns. 316L stainless steel flat-fan handles the caustic and phosphate stages; PVDF nozzles run in the DI-rinse stages to avoid metal leach into the de-ionized water; air-atomizing nozzles are used in paint and primer application. Coverage is sized for conveyor line speed (typically 6–12 ft/min) and conveyor width, with 30% pattern overlap between adjacent nozzles in every stage.

Powder coating prep washing uses a 5-stage washer - clean, rinse, phosphate, rinse, seal, with flat-fan nozzles throughout. 316L stainless-steel bodies with a 95°–110° spray angle at 15–25 PSI is the standard spec for stages 1–4; the wide angle gives full part coverage at the typical 8–12 inch standoff. Avoid hollow-cone in this application, flat-fan delivers more uniform substrate coverage on flat-stamped and tubular parts. For the seal stage, drop pressure to 10–15 PSI to avoid disturbing the conversion-coat film.

Three numbers determine the right nozzle: flow rate (GPM at your operating pressure), spray angle (matched to your substrate width and standoff distance), and material (matched to your chemistry). To get the right spec, you need line speed, conveyor width, the chemistry of each stage, target film build, and your manifold layout. Send these to our engineers and we will spec the nozzle model, pattern overlap, manifold spacing, and replacement schedule for the entire line.

Coating and surface-treatment nozzles are selected for fine droplet control, predictable flow at low PSI, and chemistry-specific body materials. A general-purpose industrial nozzle dropped into a paint booth would over-atomize, cause runs, and produce uneven film build; in a phosphate stage, a brass or carbon-steel body would corrode in weeks. The nozzles in this collection are built around droplet uniformity across the full spray pattern, material compatibility with finishing-line chemistry, and predictable wear behaviour over thousands of operating hours.