Electrophoresis Service Supplier In China
Electrophoresis, widely known as E-Coating or electrocoating, is an advanced painting process that uses an electrical current to deposit an organic coating onto a metal substrate from a water-based bath. This method is renowned for its ability to produce a highly uniform, durable, and corrosion-resistant finish that covers even the most complex geometries and recessed areas flawlessly. As a forward-thinking industrial supplier in China, Celerity Precision offers expert E-coating services, providing a superior protective and decorative finish for components used in the automotive, industrial, and electronics sectors.
For a complete, uniform, and incredibly durable coating on your most intricate parts, Celerity Precision is your premier E-coating supplier.
Your Electrophoresis Finish Manufacturer
At Celerity Precision, we are a manufacturer that leverages E-coating technology as a high-performance finishing solution. Our automated E-coating line is a sophisticated system that provides total process control. We manage the entire multi-stage pre-treatment process, including cleaning and phosphate conversion coating, which is absolutely critical for adhesion. The parts are then immersed in the electrophoretic paint bath where a DC current is applied, causing paint particles to migrate and deposit onto every conductive surface. We precisely control the voltage and immersion time to achieve a specified, uniform film thickness before the parts are cured in our industrial ovens.
This process, managed by a direct manufacturer, offers unparalleled advantages. Because the coating is deposited electrically, it naturally flows into every corner, recess, and internal cavity, eliminating the “line-of-sight” limitations of spray painting. This “wrap-around” effect is something we engineer for, ensuring full protection for complex assemblies and fabricated parts. By integrating E-coating with our CNC machining and sheet metal fabrication, we provide a streamlined, highly efficient production solution, delivering parts with a finish that is tougher, more uniform, and more corrosion-resistant than conventional painting.
Upgrade your finish to a superior, total-coverage solution. Upload your project to Celerity Precision for a quote on fully manufactured and E-coated components.
Electrophoresis (E-Coating): Technical Specifications
| Feature | Description |
| Surface Roughness (Ra) | Levels and Smooths. E-coating provides a very smooth, continuous film that covers the underlying surface. The final finish is typically very smooth with excellent leveling properties, resulting in a low Ra value. |
| Applicable Materials | Can be applied to any conductive metal substrate, including Steel, Stainless Steel, Aluminum, and Zinc-plated parts. The pre-treatment process is tailored to the specific material. |
| Cosmetic Availability | Excellent. While incredibly functional, it also provides a premium cosmetic finish. It is typically available in black, but other colors can be sourced for large projects. The finish is uniform and defect-free. |
| Visual Appearance | A very smooth, uniform, semi-gloss, or satin finish. The most common color is black. The coating is completely continuous and flawlessly covers all edges, corners, and internal surfaces, giving a high-end “dipped” appearance. |
Advantages of Electrophoresis (E-Coating) Surface Finish
Complete and Uniform Coverage
The electrical deposition process ensures every conductive surface, including deep recesses, internal cavities, and sharp edges, receives a uniform coating.
Superior Corrosion Resistance
Provides an excellent, non-porous barrier against moisture and salt spray, often exceeding 1000+ hours in salt spray testing, making it ideal for automotive and industrial use.
Excellent Adhesion and Durability
The combination of chemical pre-treatment and cured coating creates an exceptionally strong bond that is resistant to chipping, cracking, and abrasion.
Controlled, Uniform Thickness
The coating process is self-limiting, which allows for very precise and repeatable film thickness (typically 0.015-0.030mm).
Environmentally Friendly
E-coating is a water-based process with very low VOC (Volatile Organic Compound) emissions compared to traditional solvent-based painting.
Cost-Effective for High Volume
It is a highly automated and efficient process, making it a very economical choice for finishing large batches of parts.
Electrophoresis (E-Coating) Design Considerations
Racking Contact Points
Parts must be held on a conductive rack. This will leave a small "rack mark" or bare spot where the electrical contact was made. The location of these points should be considered on a non-critical surface.
Air Pockets and Drainage
The part must be designed and oriented on the rack to allow the liquid paint to fully enter all cavities (preventing air pockets) and to drain out completely before curing.
Coating Buildup
The process adds a very uniform thickness. This must be accounted for in the design of threaded holes and tight-fit assemblies. Threaded features often need to be plugged or chased after coating.
Conductivity Required
The process only works on electrically conductive materials. It cannot be used directly on plastics unless a conductive primer is first applied.
FAQ
Is E-coating a type of powder coating?
No. E-coating uses a liquid, water-based paint bath and an electrical charge to deposit the coating. Powder coating uses a dry, statically charged powder that is then melted.
Why is E-coating so common in the automotive industry?
Because it provides exceptional corrosion resistance and can completely cover the complex shapes of car bodies and chassis components, protecting them from road salt and moisture.
How thick is an E-coat finish?
It is very controllable and typically applied at a thickness of 0.015mm to 0.030mm (15-30 microns).
Can you E-coat the inside of a tube?
Yes, this is a major advantage of the process. As long as the liquid can flow into the tube and an internal electrode can be used if necessary, the inside will be coated just as uniformly as the outside.
What colors are available?
Black is the universal standard and most cost-effective color for industrial E-coating. Other colors are available but may require large batch sizes and have higher costs.
How durable is E-coating?
It is extremely durable and resistant to chipping, scratching, and chemical attack, often outperforming standard wet paint systems.
Is it better than spray painting?
For complex parts requiring total coverage and high corrosion resistance, yes. It provides a more uniform and comprehensive coating than is possible with a spray gun.
Will my part have any marks on it?
Yes, it will have small contact marks where it was held on the conductive rack. We work with you to place these in the least conspicuous locations.
Do I need to clean my parts before sending them for E-coating?
No. A thorough, multi-stage chemical pre-treatment and cleaning process is an integral and critical part of our E-coating service.
How should I specify E-coating on my drawing?
A clear note such as “Finish: Electrophoretic Black Coating, 0.02mm thickness” is perfect. You can also specify performance requirements like “Finish to withstand 1000 hours salt spray test.”