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Autodeposition is an immersion, direct-to-metal coating process that forms a paint film on metal surfaces by a chemical reaction between an aqueous paint dispersion and the base metal. The autodeposition process consists of cleaning, rinsing, organic coating deposition, and a sealing rinse. Conventional pretreatment/primer systems require full thermal cure prior to topcoat application because of volatiles that must be lost during cure. The latest autodeposition chemistry consists of an epoxy-acrylic hybrid mini-emulsion. The chemical combination of a flexible, high molecular weight acrylic with a hard, tough epoxy in a semi-interpenetrating network provides a very low VOC (≤0.03 lb/gal) coating. Upon dehydration ~100°C, the autodeposited coating provides a dry-to-handle, tack-free film with physical integrity. A powder topcoat or sealer/adhesive can be applied to the dehydrated autodeposited coating.

A new epoxy-based Autophoretic® coating has been developed and trialed at a full-scale jobber coating line. Autophoretic coatings are a proprietary series of autodepositing coatings specifically for ferrous metal substrates. An autodepositing coating is one which coats a substrate because of a chemical reaction between the paint and metal upon immersion in the aqueous paint tank. The new epoxy coating has a high level of corrosion protection, excellent appearance, and can be used as either a single coat or primer. Typical epoxy Autophoretic coating application conditions and performance data will be presented.