E-Coat (Electrodeposition Coating)
An electrically applied primer coating that provides exceptional corrosion protection to complex steel body structures as the first layer in automotive paint systems.
Overview
Electrodeposition coating (E-coat or cathodic electrophoresis) is the process by which an automotive body-in-white (BIW) is submerged in a water-based paint bath and an electrical current is applied, causing paint particles to migrate and deposit uniformly on all surfaces — including inner cavities and box sections inaccessible by spray. The result is a highly uniform anti-corrosion primer of 15–25 µm thickness covering 100% of the steel structure. E-coat is the foundation of the automotive paint system, applied before primer surfacer, basecoat, and clearcoat. Modern cathodic epoxy or polyurethane e-coat systems offer 1,000+ hours of salt spray resistance.
Automotive Applications
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Properties
Category
Type
Primer Coating
Available Colors
Available Forms
Key Properties
- Complete coverage including cavities
- Uniform film thickness
- Excellent corrosion resistance
- Strong adhesion to steel
- Paint system foundation
- Environmentally acceptable (water-borne)
Technical Specifications
Density
1.05–1.15 g/cm³ (cured film)
Sustainability
Sustainability Rating
E-coat is a water-borne system with low VOC emissions compared to solvent-based primers. High material utilisation (>95%) minimises waste.