how to clean corrosion off circuit board

Daniel Parker

2 min read

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15-01-2025

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Corrosion on a circuit board can lead to malfunctioning electronics. Fortunately, with the right tools and techniques, you can often clean it and restore functionality. This guide details how to clean corrosion off a circuit board safely and effectively. Remember, always prioritize safety and work in a well-ventilated area.

Assessing the Damage

Before you start cleaning, carefully inspect the circuit board. Determine the extent of the corrosion. Is it minor surface rust, or is it extensive and deep-seated? The cleaning method will depend on the severity of the corrosion.

Severity Levels:

• Light Corrosion: A thin layer of tarnish or discoloration on the surface.
• Moderate Corrosion: Visible corrosion on components and traces, but not heavily impacting conductivity.
• Heavy Corrosion: Significant corrosion causing visible damage to components and traces; potentially affecting conductivity.

For heavy corrosion, professional repair might be necessary. Attempting to clean heavily corroded boards can lead to further damage.

Gathering Your Supplies

You'll need several tools and materials depending on the corrosion's severity. Here's a list of essentials:

• Isopropyl Alcohol (IPA): 90% or higher concentration is best. This is your primary cleaning agent.
• Soft-bristled Brush: A toothbrush or a small detail brush works well. Avoid anything stiff that could scratch the board.
• Cotton Swabs: For precise cleaning of delicate areas.
• Safety Glasses: Protect your eyes from splashes and flying debris.
• Gloves: Protect your hands from chemicals.
• Non-conductive Tweezers: To safely handle components.
• Plastic Scraper (Optional): For gently removing stubborn corrosion. Use with extreme caution.
• Compressed Air (Optional): To blow away loose debris.
• De-ionized Water (Optional): To rinse the board after cleaning. Only use after thorough IPA cleaning.

Cleaning Process: Step-by-Step Guide

1. Preparation:

• Power Down and Disconnect: Ensure the circuit board is completely disconnected from any power source.
• Safety First: Put on your safety glasses and gloves. Work in a well-ventilated area.

2. Initial Cleaning:

• Loose Debris Removal: Use compressed air (if available) to gently blow away any loose dirt or debris.
• Brush Away Corrosion: Carefully brush away loose corrosion using your soft-bristled brush. Gently work around components.

3. IPA Cleaning:

• Apply IPA: Lightly dampen a cotton swab with IPA.
• Clean Traces and Components: Gently wipe the affected areas with the swab. Avoid excessive scrubbing. Multiple light passes are better than one harsh one.
• Let it Dry: Allow the board to air dry completely before proceeding. Don't use heat to speed up drying; this could damage components.

4. (Optional) Rinse and Dry:

• Deionized Water Rinse: If there’s significant residue after IPA cleaning, rinse with deionized water. Make sure to completely dry.
• Dry Thoroughly: Again, allow the board to air dry completely.

5. Inspection:

• Check for Remaining Corrosion: Carefully inspect the board for any remaining corrosion. Repeat steps 2-4 if necessary.

6. Reassembly:

Once completely clean and dry, carefully reassemble your device. Test it thoroughly to ensure functionality is restored.

Dealing with Stubborn Corrosion

For particularly stubborn corrosion, you might consider using a very diluted solution of white vinegar and water. Use with extreme caution and only as a last resort. Test it on an inconspicuous area first. After using vinegar, thoroughly rinse with deionized water and dry completely.

Preventing Corrosion

Preventing corrosion is key. Store circuit boards in a dry environment, away from moisture and humidity. Use conformal coatings to protect exposed components from moisture and contaminants.

Remember, cleaning a circuit board can be tricky. If you’re uncomfortable with the process, consult a professional. Improper cleaning can cause irreparable damage.