Hello Bernd, Yes the table does show up in several standards and IEC 60950-1 was one of the first where I saw it. I have notes going back to the early 1990s from the time when the standard was known simply as IEC 950. Since then it was renamed IEC 60950 and later IEC 60950-1. Now it has been replaced by IEC 62368-1 and the table is still included in Annex N. It is basically unchanged, I might add.
Before I knew of this table, the only resource I had available was a table for metals ranking them from most anodic to most cathodic and it was published by a naval guide book on corrosion. The ranking system was less than ideal since it was most likely based on empirical data and nothing was about the specific potentials for corrosion. Even so, at the time it was the best resource I had. I attempted to learn more by using the various tables in chemistry handbooks including topics such as 1st, 2nd, and 3rd ionisation potentials. However, chemists have a propensity for diving deeply into science instead of simply listing compatibility of metals in a table. It is my belief that the simplicity of the IEC table is the main reason it has survived for so long. And of course, one of the issues I have is that the 950 list of metals in that table does not nearly cover all the possible alloyed metals in use today. In addition, it makes no attempt to address the possibility of electroplated coatings to minimize corrosion. For example with Zinc or Nickel. All the best, and have a great week, -Doug Douglas E Powell Laporte, Colorado USA doug...@gmail.com http://www.linkedin.com/in/dougp01 On Mon, Feb 8, 2021 at 2:59 AM Dürrer Bernd <bernd.duer...@wilo.com> wrote: > Hi Douglas, > > > > I am only aware of Table J.1 in IEC 60950-1. Are there any other IEC > standards that reference the same or a different table? > > > > I do not know its source for sure, but the values given in this table seem > to match those from the anodic index cited in Wikipedia ( > https://en.wikipedia.org/wiki/Galvanic_corrosion#Anodic_index), which > gives the following reference: Wheeler, Gerson J., The design of electronic > equipment: a manual for production and manufacturing, Prentice-Hall, 1972. > > > > Can anybody confirm that this is the source and happens to have a copy of > the original publication? > > > > Kind regards, > > > > Bernd > > > > > > *Von:* Douglas E Powell <doug...@gmail.com> > *Gesendet:* Freitag, 5. Februar 2021 19:05 > *An:* EMC-PSTC@LISTSERV.IEEE.ORG > *Betreff:* [PSES] Friday Question - table of electrochemical potentials > > > > For years, I've used the same or similar table for dissimilar metals and > the possibility of corrosion for "pairs of common metals in use". This > table shows up in many IEC based standards and no one I know questions the > validity. I got curious as to the source and why this particular list of > "common metals" was chosen. Going as far back as the early 1990s I cannot > find any attribution to the source material. > > > > Can anyone provide some background on this? > > > > Thanks, Doug > > > > -- > > Douglas E Powell > > Laporte, Colorado USA > > doug...@gmail.com > http://www.linkedin.com/in/dougp01 > <https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.linkedin.com%2Fin%2Fdougp01&data=04%7C01%7C%7Cf1bd65beb30b4b56e63208d8ca00abdc%7C39288a38ff19432c80111cd9d0dff445%7C0%7C0%7C637481451516750325%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Bk8gGVbChDBVZEmGmC5SuuXySJtTdOINhiNyWlHavQc%3D&reserved=0> > > - > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. 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