Galvanic Series of Metals and Alloys in Sea Water ------------------------------------------------- Positive Charge Anode(+) Corroded end (anoxic, active, or least noble) Magnesium Alloys Zinc Beryllium Cadmium Uranium Aluminum Indium Tin Stainless Steel 430 Lead 1010 Steel Cast Iron Stainless Steel 410 Copper Nickel AM 350 Chromium Stainless Steel 350, 310, 304 Stainless Steel 430, 410 Stainless Steel 13-8, 17-7 PH Brass, Yellow, Navel Stainless Steel 316L Bronze 220 Copper 110 Stainless Steel 347 Copper-Nickel 715 Stainless Steel 202 Monel 400 Stainless Steel 201 Stainless Steel 321, 316 Stainless Steel 309, 13-8, 17-7 PH Stainless Steel 304, 301, 321 Stainless Steel 201, 316L Stainless Steel 286 AM355 Stainless Steel 202 Carpenter 20 AM355 Titanium Alloys AM350 Silver Palladium Gold Rhodium Platinum Carbon/Graphite Negative Charge Cathode(-) Protected End (cathodic, passive, or more noble) Regards, Frank Norman Manufacturing Support Engineer Raytheon, Space and Airborne Systems (SAS) (805)879-2745 [log in to unmask] Steve Gregory <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 09/11/03 09:16 AM Please respond to "TechNet E-Mail Forum."; Please respond to SteveZeva To: [log in to unmask] cc: Subject: Re: [TN] Zinc Plating Finish Hi Victor! What will probably happen is that the Zinc will start to corrode because of the galvanic action between itself and the tin, or tin / lead. Go to: http://www.ccfast.com/ccfcorrosion.html There you will see a Galvanic Series chart, and a simple explaination about Galvanic action. Zinc, and Tin or Tin / Lead isn't all that far apart in the chart, but far enough that the Zinc will corrode. -Steve Gregory- Fellow TechNetters: What are the exposures of having or selecting a ZINC plating finish for an ELECTRICAL CONTACT such as a solder less crimp connector and straight pin connector. What can occur if these finishes are mixed mated with a SnPb or Sn finish surface. Victor, --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------