Ed, Good question. The enclosure will only be opened to replace the fuse. Hopefully almost never.
I do not think we can just tin the surfaces with out the heat damaging the rest of existing powder coating that we did not remove. That would be an excellent solution although. The goal is to fix the existing enclosures. A cold plating sounds like a good area to investigate. Thank you, ________________________________ > Subject: RE: Conductive Paint > Date: Thu, 17 Dec 2009 07:15:34 -0800 > From: ed.pr...@cubic.com > To: emc-p...@ieee.org > > > > > > > > > > > > > > > > > > > > Ernie: > > > > > > > > Yes, conductive paints are best reserved for when other factors > dictate their use. Adhesion is tricky, the paint provides no gap-filling > effect, and mechanical wear is a problem too. > > > > > > > > The first question to answer is how often the customer will need > to open and close the mating surfaces. If the box gets sealed and never > touched, you could get good performance from just aluminum foil taping the > seams after mating. OTOH, if this is a cover that opens several times a day, > they you need to use something mechanically robust, like BeCu fingerstock or a > braided gasket > > > > > > > > I would try to use a conductive chemical treatment first. Most or > our enclosures are aluminum, so a conductive chem-film treatment is our > preference. You mentioned rust, so I assume the enclosure is steel. For a steel > box, you could simply tin the mating surfaces and use a knit mesh braid gasket. > Very old-school! You could also fabricate the enclosure from galvanized plated > steel. > > > > > > > > If all you want to do is fix the existing one field enclosure, > then there are conductive plating solutions (silver and other), that you can apply > to the mating surfaces. > > > > > > > > > > > > Ed Price > > > > ed.pr...@cubic.com > WB6WSN > > > > NARTE Certified EMC Engineer > > > > Electromagnetic Compatibility > Lab > > > > Cubic Defense Applications > > > > San Diego, CA USA > > > > 858-505-2780 > > > > > > Military > & Avionics EMC Is Our Specialty > > > >> -----Original Message----- > > > >> From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On > Behalf Of Ernest > > > >> Rayman > > > >> Sent: Thursday, December 17, 2009 6:06 AM > > > >> To: emc-p...@ieee.org > > > >> Subject: Conductive Paint > > > >> > > > >> We had en enclosure built and the sheet metal people > powder coated > > > >> every metal to metal contact surface. > > > >> We have had a couple of systems misbehave in the > field and it is an > > > >> immunity issue. > > > >> > > > >> We have scraped all the powder coating off the metal > to metal mating > > > >> surfaces but we do not like the bare metal because > it will eventually > > > >> start to rust. > > > >> I have looked into a couple of conductive paints > that we can use but > > > >> the lead engineer has expressed a distrust and > dislike of conductive > > > >> paints. > > > >> > > > >> I am looking for suggestions about what conductive > paint you have used > > > >> with success and if there are other options for rust > control this late > > > >> in the game. > > > >> > > > >> Thank you for all your help and Happy Holidays to > everybody, > > > >> Ernest Rayman > > > > > > > > - > > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to> > > > > All emc-pstc postings are archived and searchable on the web at > http://www.ieeecommunities.org/emc-pstc > > Graphics (in well-used formats), large files, etc. can be posted to that URL. > > > Website: http://www.ieee-pses.org/ > > Instructions: http://listserv.ieee.org/request/user-guide.html > > List rules: http://www.ieee-pses.org/listrules.html > > > For help, send mail to the list administrators: > > Scott Douglas> > > Mike Cantwell> > > > For policy questions, send mail to: > > Jim Bacher> > > David Heald> _________________________________________________________________ Hotmail: Free, trusted and rich email service. http://clk.atdmt.com/GBL/go/171222984/direct/01/ - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
