In message <[email protected]>, dated Mon, 14 Jan 2008, Fred Townsend <[email protected]> writes:
>1.You will get more hits when looking up Alodyne if you spell it >correctly. See http://en.wiktionary.org/wiki/alodyne It's a chromic acid passivation process. This means it uses hexavalent chromium. Let's hope there is insufficient residue of it to violate RoHS limits. >2.Both processes are clear. Some sort of dye is added for coloring. >Yellow is popular for Alodyne and black for anodize. I wonder if the yellow colour is at least partially inherent; chromates are often yellow. But I have some metal-clad power resistors that are anodized - gold colour! >3.Anodize is an oxide forming process. Aluminum oxide (and most oxides) >are insulators. Anodizing is an electrical process: a layer of oxide is built up by the action of electrolytic oxygen. Aluminium oxide is a particularly good insulator, too, and is very robust mechanically even in thin films. >4.Alodyne is a different process, i.e. not a type of Anodize and is >conductive. Alodyne is a chemical process. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk For very important information, please turn over. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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
