I can't agree with exposed copper being untarnished even after 15years, yes if they are protected by soldermask. i see my traces of my homemade PCBs showing oxidation even after 15 hours. :) ----- Original Message ----- From: "Rick C." To: Sent: Friday, July 05, 2002 12:23 AM Subject: Re: PCB cutting / tinning ... ? > I never saw the need to electroless tin plate pcb's. It's an added step with > messier chemicals. Most boards won't tarnish like a copper penny. I have > boards in working equipment for over 15 years and they still look as shiny > as the day I made them. Sometimes tin will build up an oxidation that will > cause solder to bead up and not flow properly. Obviously exposing the board > to harsh environments or continuous handling will cause the copper to > tarnish to some degree. > Rick > > Jesse Lackey wrote: > > > Hello all, > > > > I've been making my first few pcbs, using an iron-on method (laserprint > > to special paper) and they're looking sharp. > > > > But cutting them is a royal pain. I use a hacksaw and its basically > > > > > > > Also I need to cover the copper with something after its assembled to > > prevent oxidation. Tinning is mentioned ... seems like a messy and > > expensive pain. What about a "flux pen" or "flux rework"? Could I just > > spray clear acrylic sealer stuff over it? A couple coats would seal > > well, I'd think. Anyone try that? > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body