> From: John Woodgate > Sent: Monday, January 14, 2008 2:03 PM > > Tarver, Peter writes: > > >You seem certain about this. I'm unconvinced. > > I suggest you talk to a tame electro-chemist.
My lack of conviction is based on the numbers in Annex J not matching *any* of the electrochemical tables I've reviewed (not thousands, but many tens, perhaps a couple hundred). I'm unconvinced that the table is based on any valid scientific studies. > > Do you have a reference? I've been looking into the origins of the > > table in Annex J for years (off and on) and have not found a > > continuous lineage within the IEC, let alone its root. > > I agree: I couldn't find where it came from, but, as far as > it goes, the latest version (with the typos corrected) is > true. The point is that it doesn't apply in the real world, > where sulfate and, especially, chloride ions, and others, are > present. For example, copper corrodes in the presence of > chloride ions, which you wouldn't expect from the table. The vast majority of the corrosion research and tables produced that I've reviewed are based on either bathed in brackish, slow or fast moving sea water, or long term marine air exposure. It's a challenge to find the few studies I did that are based on anything else; they're out there, but hard to even find a reference to (even with as much time and effort I've put into this, I feel that I've barely scratched the surface on the subject). (There are several university consortia that produce papers regularly, but non of their research is available on line, without as fee. My budget is slightly less than zero.) Regards, Peter L. Tarver, PE [email protected] CONFIDENTIALITY This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT INTENDED AS A SUBSTITUTE FOR A WRITING. Notwithstanding the Uniform Electronic Transactions Act or the applicability of any other law of similar substance and effect, absent an express statement to the contrary hereinabove, this e-mail message its contents, and any attachments hereto are not intended to represent an offer or acceptance to enter into a contract and are not otherwise intended to bind the sender, Sanmina-SCI Corporation (or any of its subsidiaries), or any other person or entity. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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 [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
