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E-Coating provides excellent corrosion resistance, uniform coating coverage, and strong adhesion for CNC machined metal parts.
E-Coating (Electrophoretic Coating) is a highly controlled finishing method that uses electrical current to deposit a thin, uniform, corrosion-resistant coating onto conductive metal parts. The process ensures excellent coverage even on complex geometries, deep cavities, and hard-to-reach areas.
Best corrosion resistance and durability. Ideal for automotive, aerospace, and industrial components.
Anodic E-CoatingCost-effective option for decorative or lightly protective applications.
Utilizes rotating cutting tools for high-precision machining of flat surfaces, curves, and complex parts, ideal for mold making, aerospace, and automotive industries.
Uses rotating workpieces and cutting tools for efficient machining of cylindrical components, widely applied in shafts, discs, and precision parts manufacturing.
Enables multi-angle precision cutting, reducing setups and machining complex surfaces, perfect for high-end aerospace, medical devices, and precision mold manufacturing.
Dense, pinhole-free coating protects metal from rust and chemical exposure.
Ensures full coverage on edges, corners, cavities, and threads.
Provides an excellent bonding layer for paint, powder coating, or other finishes.
Typical thickness 10–35 μm without affecting tight tolerances.
Water-based coating, low VOC emissions.
Cause:Caused by improper voltage, insufficient cleaning, or uneven current distribution.
Cause:Appears when surface contamination or trapped air prevents uniform deposition.
Cause:Often caused by particles in the bath or improper pre-treatment.
Cause:Uneven curing or mixing of coating solution.
| 01 |
Pretreatment – Degreasing & Cleaning
Removes machining oils, fingerprints, coolant residues, and contaminants
to ensure excellent coating adhesion.
Typical Parameters:
Alkaline or neutral degreasing at 45–70°C for 3–10 min; multi-stage DI water rinse.
Standards:
In-house ECO-SOP-01;
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| 02 |
Surface Preparation – Acid Pickling / Phosphating
Improves adhesion, enhances corrosion resistance, and prepares the metal
surface for uniform deposition.
Typical Parameters:
Acid pickling 1–5 min; iron/zinc phosphating depending on material.
Standards:
In-house ECO-SOP-02;
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| 03 |
Rinsing (Multi-stage)
Removes chemical residues after pre-treatment to avoid defects in the
coating.
Typical Parameters:
3–5 stages of DI water rinse.
Standards:
In-house ECO-SOP-03;
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| 04 |
Ultrafiltration Rinse (UF Rinse)
Ensures consistent coating thickness and improves surface smoothness;
recovers excess paint.
Typical Parameters:
UF membrane filtration circulation.
Standards:
In-house ECO-SOP-04;
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| 05 |
E-Coating Deposition
Using electrical current, coating particles are deposited evenly onto the
grounded metal surface—even on complex geometries.
Typical Parameters:
Voltage: 150–350 V (depending on cathodic/anodic type);
Deposition time: 90–240 sec.
Standards:
In-house ECO-SOP-05;
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| 06 |
Curing
Coating is thermally crosslinked to form a hard, durable,
corrosion-resistant finish.
Tools:
160–200°C for 15–30 min.
Standards:
In-house ECO-SOP-06;
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| 07 |
Cooling & Inspection
After cooling, coating is inspected for color, gloss, thickness, adhesion,
and surface defects.
Tools:
Coating thickness gauge, adhesion tester, inspection lights.
Standards:
In-house ECO-SOP-07;
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Ideal for brackets, housings, frames, and under-hood parts.
Provides long-term corrosion protection in harsh environments.
Clean and uniform coatings, suitable for precision components.
Enhances weather resistance and durability.
Compatible with aluminum, steel, and stainless steel after proper pretreatment (phosphating / degreasing).
E-coating produces a thin, uniform film that does not hide machining marks; surface finish before coating will remain visible.
Specify all areas that must remain uncoated, including threaded holes, grounding points, tight-tolerance surfaces, and press-fit features.
Coating thickness typically 15–35 μm; minimal impact on tolerances compared with powder coating.
Typical e-coating parameters for CNC-machined metal parts
| Parameter | Typical Range | Description |
| Coating Type | Cathodic (most common) / Anodic | Cathodic E-coat offers superior corrosion resistance. |
|---|---|---|
| Coating Thickness | 15 – 35 μm | Thin, uniform film for precision parts. |
| Curing Temperature | 160°C – 190°C | Required heat to crosslink the coating. |
| Curing Time | 15 – 25 minutes | Ensures hardness, adhesion, and corrosion protection. |
| Surface Roughness Before Coating | Ra 1.6 – 3.2 μm | Optimizes mechanical bonding. |
| Pre-Treatment Requirements | Degreasing, rinsing, phosphating | Critical for uniform film and adhesion. |
| Adhesion Grade | ASTM D3359: 4B – 5B | High adhesion for industrial applications. |
| Salt Spray Resistance | 500 – 1,500 hours | Depends on coating type and pretreatment. |
| Color & Gloss | Mostly black, gloss 10–70 | Suitable for industrial and decorative use. |
| Hardness | 2H – 3H | Typical crosslinked coating hardness. |
E-coat is ideal for corrosion-resistant functional parts such as automotive brackets,
bicycle components, medical housings, and industrial hardware.
For parts requiring both protection and
decorative finish, E-coat can be used as a primer before powder coating.
Send us your part files or design drawings. Our surface finishing experts will evaluate the part geometry, surface requirements, and production volume and recommend the ideal machining process for your CNC machined parts.
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