Gary:
Although it is mechanical, I would try some of that Scotch-Brite abrasive plastic pad to burnish the metal. Use a fairly tame version, and I don’t think you will see appreciable metal removal. If you must go chemical, try some of the acidic cleaner solutions like Brite Boy, or the grade of Naval Jelly for copper. Put just a small drop on a Q-tip as an applicator and tool. You might try that very light liquid silver cleaner. Needless to say, all these methods require scrupulous washing and drying. Ed Price ed.pr...@cubic.com <blocked::mailto: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 From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of McInturff, Gary Sent: Tuesday, February 15, 2011 7:48 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Cleaning of EMC mating surfaces - suggestions I need to clean some metallic mating surfaces and since I have to use this same equipment in the future, I don’t want to just lightly sand the surfaces if I can help it. I suppose like gold contact I might be able to use the old eraser trick but I would like to chemically clean the surfaces to remove any coating contamination or oxidation without taking off the coating or the underlying metal plating – any body got a favorite cleaner? I have a support PC made by one of the biggie manufacturers that I desperately need to meet class B emissions because it is the only one I have to drive the test item. Unfortunately it has what I’m sure the Mechanical Engineer thinks is a robust solution for the I/O panel for user added cards. From a brand new one time user perspective it is pretty slick, no tools need, just snap a couple of plastic fulcrums to different position to remove or add a card. The card face mates into a very delicate little lace interface of punched tin plated “?” gasket that conforms at several points along the I/O card face panel and the inside of the computer housing. The fit happens exactly once as far as I can tell. It mostly crushes and distorts and just leaves a cap running between the I/O card faceplate and the computer chassis. I’ll give them style points – but I’m going to whack somebody over the head for the execution. (I think I hear a whaaaa-mbulance in the distance) Gary McInturff - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ 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...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>
