Electrocoating is a method of painting which uses electrical current to deposit the paint. The process works on the principal of "opposites attract". An E-coat system applies a DC charge to a metal part immersed in a bath of oppositely charged paint particles. The paint particles are drawn to the metal part and the paint is deposited on the part, forming an even, continuous film over every surface until the coating reaches the desired thickness.
The electrocoat process can be divided into four distinct steps:
1. Pretreatment cleaning and phosphating cycle.
2. Electrocoat bath cycle.
3. Post rinse cycle.
4. Baking and curing cycle.
1. Uniform coating thickness over all areas including sharp corners, recesses and areas
that would be hard to reach with spray painting.
2. Electrocoating is automatic and labor saving, requiring little maintenance.
3. Electrocoating saves the costs and operating expenses of air supply systems, fire
protection equipment, respiratory hazards and costly cleanup. The paint material is
water based and non-toxic
4. Approximately 95% utilization of paint with no overspray, drip or drain losses.
5. Complete paint coverage -no touchup required.
6. parts may be racked on the conveyor, one on top of the other with no concern for
7. Primers applied by electrocoating come out smooth and may be top coated without
The system offers better uniformity, higher density and less permeable coating than spray applications, saving up to 50% on coating materials. It is environmentally friendly, reducing emissions up to 70% and achieving nearly 100% coating utilization. Electrocoating also eliminates expenses associated with overspray cleanup and disposal.
Dial Your Coating:
The main factors controlling film thickness are the applied voltage and the film resistance. Increasing the coating voltage or lowering the specific film resistance causes an increase in film thickness. You simply dial in the desired coating thickness. The electroplating process will continue until the organic film deposited provides an electrical insulating resistance which prevents further current flow. When the coated parts are removed from the bath, they are rinsed in permeate and deionized water to remove non-deposited paint particles.