Plasma cleaning before coating

Plasma cleaning is an advanced surface preparation process used before applying Conforme coating in PCB-assemblage en SMT-assemblage. It uses ionized gas (plasma) to remove microscopic contaminants and activate the PCB surface, ensuring better coating adhesion and reliability.

How plasma cleaning works

Plasma is created by applying energy to a gas (such as oxygen, air, or argon), turning it into a highly reactive state. When exposed to the PCB surface:

• Organic contaminants (oils, flux residues) are broken down
• Particles and residues are removed at a microscopic level
• The surface energy of the PCB is increased

This process prepares the board for strong bonding with Conforme coating.

Why plasma cleaning is important

Before coating in PCB-assemblage, even tiny contaminants can lead to coating defects.

Key benefits:

• Improves adhesion of Conforme coating
• Reduces risk of delamination and peeling
• Eliminates invisible residues missed by traditional cleaning
• Enhances long-term reliability in harsh environments

It is especially critical for high-reliability SMT-assemblage toepassingen.

Types of plasma used

Oxygen plasma

• Removes organic contamination effectively
• Most commonly used before coating

Argon plasma

• Provides physical cleaning (micro-etching effect)
• Helps improve surface roughness

Air plasma

• Cost-effective alternative
• Suitable for general cleaning applications

When plasma cleaning is used

Plasma cleaning is commonly applied in:

• High-reliability electronics (automotive, aerospace, medical)
• Dense or complex PCB designs
• Products exposed to moisture, chemicals, or temperature stress
• Situations where standard cleaning is not sufficient

Plasma vs traditional cleaning

Traditional cleaning (water or solvent-based):

• Removes visible contaminants
• Limited effectiveness on microscopic residues

Plasma cleaning:

• Works at molecular level
• No liquid chemicals required
• Provides superior surface activation

Beperkingen

• Higher equipment cost
• Requires controlled process environment
• Not always necessary for low-end applications

Eindconclusie

Plasma cleaning is a highly effective pre-treatment process in PCB-assemblage en SMT-assemblage, ensuring optimal surface conditions before applying Conforme coating. By removing microscopic contaminants and improving adhesion, it significantly enhances coating performance and long-term reliability.

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Aanbevolen materiaal

• Acryl (AR)
• Silicone (SR)
• Polyurethaan (UR)
• UV-uithardbaar - UV
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