E-Coat also know as Electrocoat , electrophoretic paint, EDP or electrodeposited paint

Ecoat Description

E-coat is an electrodeposited semi-gloss black epoxy paint providing high corrosion and chip resistance while retaining tight build tolerances on fabricated parts. A uniform thickness maintains hole sizes and dispenses with the need to mask threads etc.

E-coat is widely specified by automotive manufacturers for under bonnet and under body corrosion protection on steel componentry.

How The E-coat Process WorksElectrodeposition works much like a plating process. The parts (cathode) to be coated serve as one electrode and the auxiliary electrodes (anode) serve as the oppositely charged pole as displayed by the following diagram.

fig.1 ecoat tank

Upon application of a direct current the charged polymers migrate electrophoretically to the electrode of the opposite charge, become insoluble, and form an insulating film which limits further deposition. When positively charged polymers deposit on the cathode it is referred to as cationic or cathodic electrocoating.

Ecoat Process Properties

• the cationic process is epoxy based.
• can be used as a primer or a one coat finish.
• gives very high levels of corrosion protection.
• e-coat has great throwing power ( the ability to coat recessed areas such as the inside of tubes, cavities and channels in fabricated metal components).
• coats all conductive metals including stainless steel and aluminium.
• uniform thickness builds over the entire component.
• smooth finish, with no dags or runs and high chip resistance.
• the system is alkaline in nature making it an inherent corrosion inhibitor.
• unlike anodic systems cationic systems have very little substrate dissolution giving far greater corrosion protection.