Loading...

Make 10 Etchants for Copper Printed Circuit Boards

151,481 views

Loading...

Loading...

Transcript

The interactive transcript could not be loaded.

Loading...

Loading...

Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Dec 8, 2012

We show 10 ways to make PCB etchants using easy to access chemicals

1. Hydrogen Peroxide (5mL of 3%) and Hydrochloric Acid (5mL of 37%)
Loses strength in storage but makes copper chloride that can later be used as a fully recyclable etchant.

2. Hydrogen Peroxide (10mL of 3%) + Sulfuric acid (1mL of 98%)
Loses strength in storage but can be electrochemically recycled back into copper and sulfuric acid.

3. Hydrogen Peroxide (10mL of 3%) + Sodium Bisulfate (5g)
Loses strength in storage but can be electrochemically recycled back into copper and sodium bisulfate. Extremely slow but easier to make since sodium bisulfate is easy to obtain as pH control for swimming pools.

4. Ferric chloride
Stable in storage. Somewhat complicated to recycle.

5. Copper chloride (1.6g) + 6mL water + Hydrochloric acid (5mL of 37%)
Stable in storage. Extremely easy to recycle as bubbling air through will regenerate the etchant to full capacity. Eventually will need more hydrochloric acid but nonetheless easy to do.

6. Copper sulfate (3g) + Hydrochloric acid (10mL of 37%)
Stable in storage. Functionally identical to copper chloride and hydrochloric acid. Sulfate contamination does not interfere with activity. Easy to make due to availability of copper sulfate.

7. Bleach (2mL of 6%) + Hydrochloric acid (10mL of 37%)
Loses strength in storage. Produces toxic chlorine gas so must be used outside or in a fume hood. Very easy to make but not economical to recycle.

8. Manganese dioxide (0.5g) + Hydrochloric acid (10mL of 37%)
Loses strength in storage. Produces toxic chlorine gas so must be used outside or in a fume hood. Very easy to make but not economical to recycle.

9. Nitric acid (20%)
Stable in storage. Produces toxic nitrogen monoxide gas so must be used outside or in a fume hood. When depleted can be boosted once by addition of sulfuric acid. after which copper sulfate waste can be electrochemically recycled.

10. Potassium nitrate (3g) + Hydrochloric acid (12mL of 37%)
Loses strength in storage. Produces toxic chlorine, nitrogen monoxide and nitrosyl chloride gas so must be used outside or in a fume hood. Not economical to recycle.

Loading...

Advertisement
When autoplay is enabled, a suggested video will automatically play next.

Up next


to add this to Watch Later

Add to

Loading playlists...