Establishing the first line of defense against vehicle body corrosion

The pretreatment and electrophoresis line is a core process in an automotive paint shop. It performs a series of surface treatments on the body-in-white, including degreasing, surface conditioning, phosphating, and electrocoating, forming a uniform and dense anti-corrosion base film.

This process directly determines the vehicle’s corrosion resistance life and the quality of the topcoat, serving as the fundamental guarantee for achieving high-quality and durable vehicle bodies.

Function of Pretreatment and Electrophoresis

—— Removes oil, rust, and oxide scale from workpieces, providing a clean surface for subsequent coating.
—— Phosphating forms a dense conversion film, significantly improving paint adhesion and corrosion resistance.
—— electrocoating ensures uniform coverage in cavities and seams, achieving comprehensive anti-corrosion protection.
—— Forms a consistent electrocoat primer, providing a solid foundation for intermediate and top coats.
—— Closed-loop process reduces paint waste and meets environmental protection and energy-saving requirements.

Structural features of pretreatment and electrophoresis system
—— Consists of pretreatment (degreasing, surface conditioning, phosphating, water washing) and electrophoresis coating, with cathodic electrophoresis as the mainstream process.
—— Combines spray and immersion methods, together with automated conveying systems such as hoists and skid/chain conveyors, enabling continuous or intermittent transfer between tanks.
—— The entire line adopts a fully or semi-closed structure, equipped with exhaust gas collection and wastewater treatment systems to meet environmental compliance requirements.
—— Each process tank is equipped with circulation filtration, temperature control, ultrafiltration, deionized water, and automatic dosing systems to ensure stable bath conditions and uniform coating quality.