Electrocoating advantages

After the successful introduction to appliances, the automotive industry began a major conversion to cationic electrocoating. Advantages of the system are good chemical resistance, excellent salt spray resistance, hardness of 4H+, flexibility, and low dissolution of phosphate at the anode (33). 

Cationic electrocoating is now used on dryer drums, washer cabinets, and areas where superior corrosion resistance is required. Although cationic electrocoating is somewhat more expensive (10% higher than anodic), its advantages for certain applications justifies the higher cost. 

The binders for cathodic electrodeposition are epoxy resin combinations dispersed in water (see Section 3.8). Advantages of anticorrosive electrocoatings include excellent corrosion resistance at a dry film thickness of ca. 20-30 pm. Electrocoats are stoved at 165 -185 °C to obtain films with the desired properties. The paint industry is now developing electrocoats that can be cured at lower temperatures (140 150 "C). Electrocoating produces a homogeneous film that covers the entire car body surface, including recesses and cavities. 

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