Duncan, >From the Galvanic Compatibility Chart in the back of Instrument Specialties >(Now called Laird Technoligies) catalog.
Tin plating has an anodic index of 0.6V Copper itself has an anodic index of 0.35V For tin plated copper; I would use 0.6V. Galvanized Steel (either hot dip or eletrogalvanized) has an anodic index of 1.2V Most steels (including stainless) themselves are between 0.5V and 0.6V I'm not sure if zinc "passivated" steel is the same as galvanized steel. According to the tables, a general guideline is: A difference of less than 0.10V is OK for harsh environments (humid, salt air..) A difference of 0.25V is OK for normal (warehouse...) environments A difference of 0.5V is OK for temperature/humidity controlled office environments. The table warns that it provides "general guidelines"; so be warned. Another excellent reference on this subject is MIL-STD-105D. I have used it before; but, I don't have it here in front of me. I believe that it is available on the web from astimage.daps.dla.mil/quicksearch/ Best regards, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | > -----Original Message----- > From: duncan.ho...@snellwilcox.com [SMTP:duncan.ho...@snellwilcox.com] > Sent: Friday, June 07, 2002 6:18 AM > To: emc-p...@majordomo.ieee.org > Subject: Electrochemical potentials > > > Group, > Has anyone ever used a combination of metals not listed in annex J of > EN60950 for a protective earthing connection? If so can anyone suggest a > decent > source of information on electrochemical potentials for various materials. > > The particular materials in question are tin plated copper on zinc passivated > steel. Can anyone advise on the electrochemical potential of such a > connection? > > Many thanks in advance, > Duncan. > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
