Spray/tunnel pretreatment is the spraying  liquid to workpiece surface by pump, in order to finish surface treatment process.

Continuous liquid spray to workpiece surface has not only chemical function, but also has mechanical shock function. It can reduce treatment time with high production efficiency.

Process stages

Every process stage consists of a tank with one or more strong vertical pumps distributing the liquid to a number of rinse ramps fitted with nozzles.

Usually, the process of pretreatment includes: degrease, rinse, DI rinse, Phosphatizing(or silane, NANO), Picking (or shot blasting) and so on.

Our engineer will design the suitable process of pretreatment equipment  according the material of product and customer’s requirement.