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Equipment/PCB etch station: Difference between revisions
From London Hackspace Wiki
→CuCl2 Etchant
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The preparation so far contains 540g copper, 2900ml 38% HCl, 1750ml water. SG is 1260. This is ready for use - air has been bubbled through it and it has reached the bright green colour indicating it has converted copper to cupric chloride. The acid concentration appears to be correct and I have reconnected the heater. It may be used for etching, but there is no large air bubbler in the tank so may need to be agitated by hand (jiggle the basket containing your PCB). If the etchant is not bright green, please leave the small fishtank bubbler running. The bubbles will regenerate the etchant. | The preparation so far contains 540g copper, 2900ml 38% HCl, 1750ml water. SG is 1260. This is ready for use - air has been bubbled through it and it has reached the bright green colour indicating it has converted copper to cupric chloride. The acid concentration appears to be correct and I have reconnected the heater. It may be used for etching, but there is no large air bubbler in the tank so may need to be agitated by hand (jiggle the basket containing your PCB). If the etchant is not bright green, please leave the small fishtank bubbler running. The bubbles will regenerate the etchant. | ||
DO NOT ETCH ANYTHING EXCEPT COPPER IN THIS TANK | '''DO NOT ETCH ANYTHING EXCEPT COPPER IN THIS TANK''' | ||
See [[File:CuCl.pdf]] for maintenance instructions. These are basically : Check colour. Bubble if dark. Titrate against 1 molar NaOH to check acid concentration (this only requires a check for precipitate, no need for acid indicator). Add HCl if necessary. | See [[File:CuCl.pdf]] for maintenance instructions. These are basically : Check colour. Bubble if dark. Titrate against 1 molar NaOH to check acid concentration (this only requires a check for precipitate, no need for acid indicator). Add HCl if necessary. | ||
===Usage configuration=== | ===Usage configuration=== | ||
