Electrophoretic Deposition (E-Coating) of Aircraft Parts

Electrophoretic Deposition (EPD), commonly known as E-coating, is an advanced coating method used in the aerospace industry to provide corrosion resistance, uniform coating coverage, and improved paint adhesion. It is a highly controlled electrochemical process that applies a protective coating to metal aircraft components by immersing them in a water-based solution containing paint or protective resins.

How E-Coating Works

1. Surface Preparation – The metal part is thoroughly cleaned (degreasing, acid etching) to remove dirt and oxidation.
2. Immersion in E-Coating Bath – The part is submerged in an electrically charged bath containing coating particles (resins, primers, or paints).
3. Electrodeposition – An electric current is applied, causing coating particles to migrate and deposit onto the part’s surface in a uniform layer.
4. Rinsing – Excess coating is removed with deionized water to ensure consistency.
5. Curing/Baking – The coated part is heat-cured to harden the protective layer.

Types of E-Coating Used in Aerospace

1. Cathodic E-Coating

• Best corrosion protection (ideal for aerospace applications).
• Uses a cathodic charge to deposit coatings with strong adhesion.
• Common for aircraft structural components, fasteners, and landing gear.

2. Anodic E-Coating

• Provides moderate corrosion resistance but is more porous.
• Uses an anodic charge, making it less durable than cathodic coatings.
• Used in non-critical aerospace applications.

Aerospace Applications of E-Coating

✔ Airframe & Structural Components – Protects aluminum and steel parts from oxidation. ✔ Landing Gear & Fasteners – Enhances wear and corrosion resistance. ✔ Hydraulic & Fuel System Components – Prevents chemical corrosion. ✔ Electrical & Avionics Housings – Provides insulation and moisture protection.

Advantages of E-Coating in Aerospace

✅ Superior Corrosion Resistance – Provides long-term protection against oxidation and harsh environments. ✅ Uniform & Consistent Coating – Evenly coats complex shapes and hard-to-reach areas. ✅ Lightweight Protection – Does not add significant weight to aircraft components. ✅ Cost-Effective & Scalable – Ideal for high-volume production of small and medium-sized parts. ✅ Eco-Friendly – Uses water-based coatings with low volatile organic compounds (VOCs).

Industry Standards for Aerospace E-Coating

• MIL-PRF-85582 – Military specification for E-coat primers.
• AMS 2700 – Aerospace standard for corrosion-resistant coatings.
• RoHS & REACH Compliant – Environmentally friendly alternatives available.