Yahoo Groups archive
Thread
2004-02-16 by Dave Mucha
Hi all, I am thinking about tin coating boards before mechanical etching and was wondering if anyone else does something similar and how they do it ? A friend said to send them out to a tin coater or buy a solder pot..... Who do you tin after etching ? Dave
2004-02-17 by wheedal99
--- In Homebrew_PCBs@yahoogroups.com, "Dave Mucha" > I am thinking about tin coating boards before mechanical etching >... > A friend said to send them out to a tin coater or buy a solder > pot..... > > > Who do you tin after etching ? I do occasionally dip the board in a "tinit" (-brand name) solution after chemical etching my boards. Its a solution of a dry white powder (that you order) and hot water. It applys a very thin gray metal plating to the traces. I've found this generally isn't thick enough to survive the solder paste + oven. --The flux in the paste, (I guess), just eats away some of the plating because it ends up needing to be "touched up" later with some solder +solderwick later anyway. It may just be easier to do as your friend suggests with the solder pot --although that might not make your high density smt's lay flat enough on your board later.
2004-02-17 by Leon Heller
Leon Heller, G1HSM Email: aqzf13@... My low-cost Philips LPC210x ARM development system: http://www.geocities.com/leon_heller/lpc2104.html
----- Original Message ----- From: "wheedal99" <wheedal@...> To: <Homebrew_PCBs@yahoogroups.com> Sent: Tuesday, February 17, 2004 4:49 AM Subject: [Homebrew_PCBs] Re: tin coating before etching > --- In Homebrew_PCBs@yahoogroups.com, "Dave Mucha" > > I am thinking about tin coating boards before mechanical etching > >... > > A friend said to send them out to a tin coater or buy a solder > > pot..... > > > > > > Who do you tin after etching ? > > I do occasionally dip the board in a "tinit" (-brand name) solution > after chemical etching my boards. Its a solution of a dry white > powder (that you order) and hot water. It applys a very thin gray > metal plating to the traces. I've found this generally isn't thick > enough to survive the solder paste + oven. --The flux in the paste, > (I guess), just eats away some of the plating because it ends up > needing to be "touched up" later with some solder +solderwick later > anyway. It may just be easier to do as your friend suggests with the > solder pot --although that might not make your high density smt's lay > flat enough on your board later. You can always use some desolder braid with a soldering iron to level any SM pads by removing the excess solder. Leon -- Leon Heller, G1HSM Email: aqzf13@... My low-cost Philips LPC210x ARM development system: http://www.geocities.com/leon_heller/lpc2104.html
2004-02-17 by Adam Seychell
Electroplated tin is the best method for plating a entire black board. You get controlled thickness, and your bath never "runs out". For tin electroplating solutions, talk to your local plating supplier, and ask for some bright acid stannous sulfate solution. The owners of a plating shop may give you a liters from their bath. It should look yellow milky color. You also need tin anodes. Adam Leon Heller wrote:
> Leon Heller, G1HSM > Email: aqzf13@... > My low-cost Philips LPC210x ARM development system: > http://www.geocities.com/leon_heller/lpc2104.html > > ----- Original Message ----- > From: "wheedal99" <wheedal@...> > To: <Homebrew_PCBs@yahoogroups.com> > Sent: Tuesday, February 17, 2004 4:49 AM > Subject: [Homebrew_PCBs] Re: tin coating before etching > > > >>--- In Homebrew_PCBs@yahoogroups.com, "Dave Mucha" >> >>>I am thinking about tin coating boards before mechanical etching >>>... >>>A friend said to send them out to a tin coater or buy a solder >>>pot..... >>> >>> >>>Who do you tin after etching ? >> >>I do occasionally dip the board in a "tinit" (-brand name) solution >>after chemical etching my boards. Its a solution of a dry white >>powder (that you order) and hot water. It applys a very thin gray >>metal plating to the traces. I've found this generally isn't thick >>enough to survive the solder paste + oven. --The flux in the paste, >>(I guess), just eats away some of the plating because it ends up >>needing to be "touched up" later with some solder +solderwick later >>anyway. It may just be easier to do as your friend suggests with the >>solder pot --although that might not make your high density smt's lay >>flat enough on your board later. > > > You can always use some desolder braid with a soldering iron to level any SM > pads by removing the excess solder. > > Leon > -- > Leon Heller, G1HSM > Email: aqzf13@... > My low-cost Philips LPC210x ARM development system: > http://www.geocities.com/leon_heller/lpc2104.html > > > Be sure to visit the group home and check for new Bookmarks and files: > http://groups.yahoo.com/group/Homebrew_PCBs > Yahoo! Groups Links > > > > >