What is E-Coating: A Definitive Guide

Machined components require secondary processes that improve their surface finishing and enhance their functionality. There are different types of surface finishing processes and among them, e-coating is also widely adopted.

The guide below tells everything about what e-coating is, how it is applied, and what benefits it offers. So, let's read below.

What is E-Coating?

E-coating is a surface finishing process in which the components are submerged in a bath of a water-based solution containing epoxy or paint. The layer of paint sticks to the surface until the desired finished component is attained.

How E-coating Works？

The process of e-coating has several steps, and each step is discussed below.

Cleaning

The components to be coated are first cleaned using degreasers so that any dirt, impurities, or oil can be removed, improving the adhesion of the coating.

Rinsing

After cleaning the component, make sure to rinse it so that the residues from the component are removed.

Surface Treatment

The surface of the component is treated with either chromate or phosphate coating, which enhances the adhesion and makes it resistant to corrosion. It is basically a process where the component is stabilized for an improved coating impact.

Submerging in Solution

The component is then rinsed again using deionized water and then immersed in a water-based solution bath that has the coating.

Electrocoating

Electric current is then applied to the components, which creates attraction between the particles and deposits the coating on the surface.

Curing and Cooling

Once the coating is carried out, the components are kept at a high temperature for curing so that the coating is hardened and sticks perfectly to the surface. Once cooled, the components are ready for use.

Characteristics of E-Coating

E-coating has some characteristics that make it suitable for applications, and these are as follows:

• It offers uniform coverage and even covers areas that are hard to reach.
• It ensures protection against corrosion.
• The e-coated component is hardened and, hence, resistant to impact, wear, and chipping.
• The water-based solutions used for e-coating ensure environmental friendliness.

Advantages and Disadvantages of E-Coating

E-coating has benefits as well as limitations, and these are highlighted in the section below:

Avantages

• The process of e-coating is cost-effective. If high-volume components are coated, it offers economies of scale.
• It is a very simple process and can be carried out very quickly.
• It creates a thin layer on the components, which ensures precision.
• Due to the electric discharge, the particles are attached to the surface evenly and create a uniform coat.
• The components that have been treated with e-coating are easy to clean and maintain.
• It is an environmentally friendly process and can be subjected to recycling.

Inconvénients

• Since e-coating is mostly opted for large-scale components, it may not be available for small-scale projects.
• If thick coating is required, the process of e-coating is not suitable.
• It offers low stability and UV resistance.

Which Materials are Suitable for E-Coating?

The materials that are suitable for e-coating are as follows:

Steel: Steel is a very commonly used material in most applications, and every type of steel can be e-coated. The process creates a barrier of protection, and the components can be kept away from corrosion and rust.

Aluminum: Aluminium is also a very suitable metal which helps with e-coating. It is lightweight so it is used in automobiles, electronics, and aerospace. E-coating these aluminum components ensures resistance against weathering and also enhances the structural integrity of the components.

Zinc: Zinc components are also coated using an e-coating process, which provides a layer of protection against corrosion.

Cast iron: The components made using cast iron are used in applications that need high strength. It helps protect the components from moisture and chemicals, ensuring their life.

Applications of Using E-coating

The applications of e-coating can be observed in various industries, and some of these are as follows:

Automobile : E-coating protects the sheet of steel that is used in the doors and fenders of a car from corroding.

Électronique : E-coating protects the circuit boards on electric applications from oxidation and contamination.

Marine: Steel and aluminum components used in yachts and boats are protected from corrosion.

Aérospatiale : E-coating protects the aircrafts from wearing off and these components consist of hinges, doors, and landing gear.

Things to Consider Before E-coating

Some of the considerations which are important to be taken into account while opting for e-coating are as follows:

• The material chosen for e-coating should be compatible with the process.
• Surface preparation is a prerequisite for the e-coating process to ensure adhesion.
• The thickness of the coating must be determined based on the specifications of the components.
• The components that are subjected to e-coating should have high electrical conductivity to ensure the success of electrocoating.

E-Coating vs. Powder Coating

E-coating and powder coating are processes opted for finition de surface of the components. However, e-coating offers an ultra-thin, uniform coating and helps to cater to components that have intricate shapes.

Meanwhile, revêtement en poudre has the ability to offer multi-colored coating and texture. It is suitable for multiple applications. It is even suitable for outdoor applications as it offers protection against UV rays.

Conclusion

E-coating is a versatile process widely used in different industries. It enhances the surface finish and performance of a component.

If you are looking to have your components finished through e-coating, DEK can be your go-to choice. We have an expert team overseeing the process to ensure a smooth finish and durable results.