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through_hole_plating [2013/08/13 12:13] (current)
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 +===== **Through hole plating of PCBs by acid copper.** =====
 +**Constant current, pulse and reverse pulse processes**
 +
 +{{:​throughholepcb0.jpg|thumb|early attempt with powdered carbon for hole activation}}
 +
 +{{:​throughholeplate1.jpg|thumb|sample after we figured out levelers and brightening}}
 +
 +{{:​thourhgholeplated2.jpg|thumb|microscope shot of hole, after plating.  ​
 +The current calculation were a little off, hence the bumpy plating in the hole.]]
 +
 +{{:​throughholeplate3.jpg|none|400px|caption}}
 +
 +{{:​throughholeplate4.jpg|none|400px|caption}}
 +
 +[[http://​www.flickr.com/​photos/​nullspacelabs/​sets/​72157625578867973/​|More Pics]]
 +[[http://​www.flickr.com/​search/?​q=nsl+plating&​m=tags|Pics tagged 'NSL plating'​]]
 +
 +====  Formula: ​ ====
 +
 +
 +<​code>​
 + ​**Ingredients:​**
 + .881 lb of crystal (CuS04)to each gallon of DI water
 + .4 gal 35% sulfuric acid (H2SO4)
 + .5ml hydrochloric acid (HCL)
 + PEG 10mg/L leveler (found as laxative at RiteAid)
 + Janus Green B as brigtner
 + ​**Tips:​**
 + ​-Makes about 1.5gal
 + -Can push about 25amps per sqft but we have been using 8amp/sqft as the plating seems brighter and more level
 + -With a little agitation it seems we can push 10amps/sqft with out diminishing brightness.
 + ​-Light sanding after activation is very important (1000 grit sandpaper)</​code>​
 +
 +====  Power Supply ​ ====
 +
 +
 +<​code>​
 + DIY TPM
 + ​http://​www.dioda.ro/​tutorial/​TroughHole_MZingg/​Welcome%20to%20the%20homebrew%20through%20plating%20machine.html
 + ​http://​www.dioda.ro/​tutorial/​TroughHole_MZingg/​Welcome%20to%20the%20homebrew%20through%20plating%20machine2.html
 + ​http://​www.dioda.ro/​tutorial/​TroughHole_MZingg/​Welcome%20to%20the%20homebrew%20through%20plating%20machine3.html
 + ​http://​www.dioda.ro/​tutorial/​TroughHole_MZingg/​Welcome%20to%20the%20homebrew%20through%20plating%20machine4.html
 + ​http://​www.dioda.ro/​tutorial/​TroughHole_MZingg/​Welcome%20to%20the%20homebrew%20through%20plating%20machine5.html
 + ​http://​www.dioda.ro/​tutorial/​TroughHole_MZingg/​Welcome%20to%20the%20homebrew%20through%20plating%20machine6.html
 + ​http://​www.dioda.ro/​tutorial/​TroughHole_MZingg/​Welcome%20to%20the%20homebrew%20through%20plating%20machine7.html</​code>​
 +
 +====  Concepts and Research ​ ====
 +
 +<​code>​
 + Pulse and pulse reverse plating—Conceptual,​ advantages and applications
 + ​{{:​ea-v53-8-p3313.pdf}}
 +
 +<​code>​
 + Role of Additives in the Bright Copper Plating from Acid Copper Sulfate Bath and the History
 + ​{{:​0611.pdf}}
 +
 +<​code>​
 + ​Aspect-Ratio-Dependent Copper Electrodeposition Technique for Very High Aspect-Ratio Through-Hole Plating
 + ​http://​dx.doi.org/​10.1149/​1.2189238
 + The Theory behind Pulse Plating Reversal Current
 + {{:rp theory.pdf}}
 +
 +<​code>​
 + ​Prototype of the Pulse Plating controller.
 + ​{{:​platingcontroller.jpg}}
 +
 +
 +<​code>​
 + ​[[http://​www.youtube.com/​watch?​feature=player_embedded&​v=KTNuTv_IQp4|Another plating setup]]</​code>​
 +
  
through_hole_plating.txt · Last modified: 2013/08/13 12:13 (external edit)