Benefits of Plasma Treatment Technology

Plasma surface treatment is an effective solution for preparing industrial components before processes such as bonding, painting, varnishing, and coating, which is why it’s relevant to highlight the benefits of this technology.

Machines using this technology employ ionized gas (plasma) to clean and chemically activate the surface of parts. As a result, they increase surface energy (wettability) and improve the adhesion of paints, glues, varnishes, or other coatings.

Regarding temperature, plasma can be cold or thermal: in the first case, it’s a low-temperature treatment typically used with sensitive materials and for cleaning or sterilization applications.

Thermal plasma, on the other hand, reaches very high temperatures and can be used for cutting, welding, or nanoparticle synthesis.

Due to its many benefits, plasma treatment is used across various industries, increasing the durability and performance of numerous materials.

Some of the main application examples are found in the automotive industry, but this technology can also be used in the aerospace, biomedical, and packaging industries.

How Plasma Works

Plasma is a gas composed of electrically charged and highly reactive particles, which can be observed as a torch generated from gases such as compressed air.

Unlike a conventional flame, it doesn’t involve combustion or produce hazardous effluents, making it a clean and environmentally safe method.

Plasma treatment technology requires a higher investment and can be applied in a vacuum (low pressure), offering high control and purity, important requirements in microelectronics and thin-film deposition.

It can also be used at atmospheric pressure, operating at ambient pressure levels. This is a simpler and more economical option that can be easily integrated into continuous production lines.

When plasma comes into contact with a surface, its reactive species act on the outer molecular layer of the material (5–10 nm deep).

This type of “bombardment” breaks stabilized chemical bonds on the surface, removing organic impurities and activating previously inert atoms.

As a result, a chemically unstable layer is formed with the ability to create new bonds. At the same time, atoms and radicals can adhere to the surface, introducing polar functional groups that replace the original ones.

Thus, plasma treatment chemically oxidizes or polarizes the surface uniformly, increasing its surface energy without altering the volume properties of the material (in cold plasma).

The image below illustrates the impact of plasma treatment on the wettability of a surface.

On the left, a drop of water-based paint applied to an untreated adhesive tape shows a small and limited contact area.

On the right, the same adhesive tape after plasma treatment shows the paint spreading completely, breaking surface tension and covering a much larger area.

One of the main highlights of cold plasma technology is that it exclusively modifies the outer layer of the material, ensuring that the mechanical, electrical, and structural properties of the rest of the material are preserved.

It also has the advantage of being a dry process. Therefore, even parts with complex geometries, internal areas, or difficult-to-reach spots can be treated effectively and uniformly with plasma.

The surfaces to be treated can be made of polymers, metals, glass, ceramics, or composites, and plasma generation methods vary, including:

• Glow discharge: low-pressure plasma, common in cleaning and surface activation.
• Arc discharge: high current and intense heat, used in cutting and welding.
• Microwave plasma: ideal for thin-film deposition.
• Radio frequency (RF) plasma: frequency-controlled, widely used in the semiconductor industry.
• Dielectric barrier discharge (DBD): atmospheric plasma used in sterilization and gas treatment.
• Plasma jet: directed flow for localized treatments, including medical and electronic applications.

Integration into Production Lines

Plasma application machines can be easily integrated into existing industrial processes, especially atmospheric-pressure plasma.

For example, in an assembly line or sealant/adhesive application process, a plasma application station can be installed to chemically activate the desired surfaces.

This way, surfaces become highly receptive for the bonding phase, maximizing adhesion.

Since the activation effects of a surface are temporary, plasma treatment is commonly performed in-line, meaning immediately before the next process (painting, for example).

If too much time passes or the surface is exposed to other agents between stages, contamination may occur and reduce the intended effectiveness.

With an automated industrial plasma treatment system, the process can be monitored in real time to ensure that each part receives appropriate treatment.

Industrial Applications

The application of plasma on parts and components has practical uses across a wide range of industries. Here are the main examples of the functions of this technology:

• Cleaning: removes surface contaminants and organic residues.
• Activation: improves surface adhesion and chemical reactivity.
• Etching: removes specific layers of the material.
• Coating: deposits thin and uniform films.
• Operation: introduces specific chemical groups, increasing hydrophilicity and other surface properties.

Benefits of Plasma Treatment Technology

There are several benefits to plasma surface treatment compared to other surface preparation methods (such as mechanical sanding or chemical primers). The main advantages are:

• Eco-friendly and safe: eliminates the use of hazardous chemicals, produces no toxic waste or effluents, and reduces risks for operators.
• Significant improvement in surface adhesion: treated surfaces become more adhesive, creating stronger and longer-lasting bonds.
• High versatility: highly effective on various materials, even those with low surface energy, and ensures uniform application on parts with complex or irregular geometries.*
• Cold process: since it uses no flames or thermal treatments, cold plasma operates at low temperatures and doesn’t damage heat-sensitive materials or alter the dimensional structure of parts.
• High precision: plasma can be applied exclusively to a desired area (such as an edge to be bonded) without affecting the rest of the part, which is harder to achieve with liquid chemical treatments.
• Compatibility with continuous production: plasma treatment is a very fast process and can be easily integrated into a production line without significantly increasing the cycle time.
• Improved final product quality: plasma-treated surfaces achieve higher-quality and more durable finishes, as strong adhesion reduces issues like paint loss, layer separation, or coating infiltration over time.

*For some materials, specific post-treatment gases (such as oxygen or ammonia) are required.

Selmatron Plasma Treatment Solutions

Plasma treatment technology is the ideal solution to meet the demands of various industries, as it doesn’t cause deformation or thermal damage to plastics, anodized aluminum, or electronic components.

Selmatron enhances your business’s surface preparation capabilities, reducing the impact of harmful chemicals used in other methods and delivering greater quality across a wide range of processes, including surface cleaning and chemical activation.

Selmatron’s plasma treatment machines are robust systems designed for proper integration into your production process, offering greater energy efficiency and control.

We develop the industrial machine that fits your process.

Get in touch with us!