The pretreatment equipment of the coating production line is a common equipment for surface treatment. It is a process to thoroughly clean the scale, rust, grease, dust and other dirt on the workpiece surface before coating, so that the coating powder can be firmly combined with the metal surface with strong adhesion, so that the product can obtain higher quality and prolong the service life of the product.
Pretreatment can be divided into spray type, immersion type, submerged type or combined type. The treatment method can be selected according to the workpiece and specific production requirements. A complete set of pretreatment production line equipment consists of tank body, spray system, heating and temperature control system, ventilation system, phosphating solution sedimentation and slag removal system, spray chamber body and lighting device. The production line can realize full automatic control.
Pre treatment equipment generally adopts spray type multi station pre-treatment unit. Its principle is to use mechanical scouring to accelerate chemical reaction to complete the process of oil removal, phosphating, water washing and so on.
Typical spray pretreatment processes for steel parts are pre degreasing, degreasing, water washing, water washing, surface conditioning, phosphating, water washing, water washing and pure water washing.
The pre-treatment can also adopt shot blasting machine, which is suitable for steel parts with simple structure, serious corrosion, no oil or little oil. Its advantage is no water pollution.