Re: [PEDA] Gold or silver plating
Thanks for all the help guys. In the end I went with gold plating, and specified that the PCB's are delivered heatshrinked in plastic. Wayne Bickers Electronics Engineer Tru-Test Ltd -Original Message- From: Waldemar Kulajew [SMTP:[EMAIL PROTECTED]] Sent: Wednesday, 24 April 2002 5:52 p.m. To: Protel EDA Forum Subject: Re: [PEDA] Gold or silver plating John Williams schrieb: I wonder if the use of a vacuum foodsaver (e.g. http://www.tilia.com/ ) would be helpful here? John Williams It is! We use vacuum packages to store PCBs. Also our warehouseman (-right word?) is not to happy with the handling. It a way our baordhouse recomend us to do, and they deliver us our boards this way. Waldemar Kulajew * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Gold or silver plating (Sort of Off Topic)
The black silver oxide layer that will form has low electrical conductivity... Just out of curiosity, I thought silver oxide was conductive? Although I do agree that it would be hard to solder to... Tim * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Gold or silver plating (Sort of Off Topic)
At 11:54 AM 4/23/2002 -0300, you wrote: The black silver oxide layer that will form has low electrical conductivity... Just out of curiosity, I thought silver oxide was conductive? Although I do agree that it would be hard to solder to... Tim Its terrible for RF, I might point out. One thing you don't want on your transmission lines is a thick silver oxide coating. Highly resistive. If you have oil refineries in your area or other sulfur-producing plants in the area, those unprotected silver-coated boards will turn black fast. We once cleaned all the plate lines of a 6kw transmitter with Tarn-X from black to shiny and witnessed a shocking 40% increase in efficiency. And this was at a relatively low frequency, 100 Mhz. Solved his pesky power output problem. Frank Frank Gilley Dell-Star Technologies (918) 838-1973 Phone (918) 838-8814 Fax [EMAIL PROTECTED] http://www.dellstar.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Gold or silver plating (Sort of Off Topic)
Silver oxide is conductive - more conductive than copper oxide. However, it is less conductive than any of the atmospheric oxides of gold. Silver oxide breaks down easily under mechanical pressure - hence the use in connector pins, relay contacts, etc. At 11:54 AM 4/23/02 -0300, you wrote: The black silver oxide layer that will form has low electrical conductivity... Just out of curiosity, I thought silver oxide was conductive? Although I do agree that it would be hard to solder to... Tim snip * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Gold or silver plating
I've been using gold over silver succesfully for prototype boards. The main reason I started this is because I need/want to avoid Ni on my RF boards. I used to use just silver but had problems with silver sulphide buildup after people had handled the boards. The Au provides a good protection for the Ag. Au over Ag may be unique to my fabricator (and may well have been developed in direct response to my needs), but I don't know that there's anything particularly difficult involved - I certainly don't get charged any extra. John Haddy -Original Message- From: Wayne Bickers [mailto:[EMAIL PROTECTED]] Sent: Tuesday, 23 April 2002 11:50 AM To: Protel EDA Forum Subject: [PEDA] Gold or silver plating Sorry this is a little off topic but you guys are the ones who will know. I have 3 issues, 1) I require a smooth finish, hence gold or silver plating/ flashing 2) I need the PCB's to last in stores for a period of time, for arguements sake call it 1 year without oxidising 3) I need to have some pads hand soldered and require a good wetting effect (spreading of the solder when applied) I would appreciate it if anyone out there has tried both and could indicate which may be the better finishing material to use. thanks Wayne Bickers Electronics Engineer Tru-Test Ltd * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Gold or silver plating
Wayne Bickers wrote: Sorry this is a little off topic but you guys are the ones who will know. I have 3 issues, 1) I require a smooth finish, hence gold or silver plating/ flashing 2) I need the PCB's to last in stores for a period of time, for arguements sake call it 1 year without oxidising 3) I need to have some pads hand soldered and require a good wetting effect (spreading of the solder when applied) I would appreciate it if anyone out there has tried both and could indicate which may be the better finishing material to use. Keep the unused boards in a zip-lock bag before use, and they will stay in good shape. Don't store any paper (may give off acids) inside the bag. If the bag has a hole in it, you will see a dark disk right under the hole after a few years. If you have air pollution (sulfur dioxide in the air) silver will turn brown or black after a few years. Jon * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Gold or silver plating
I wonder if the use of a vacuum foodsaver (e.g. http://www.tilia.com/ ) would be helpful here? John Williams Jon Elson wrote: Keep the unused boards in a zip-lock bag before use, and they will stay in good shape. Don't store any paper (may give off acids) inside the bag. If the bag has a hole in it, you will see a dark disk right under the hole after a few years. If you have air pollution (sulfur dioxide in the air) silver will turn brown or black after a few years. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Gold or silver plating
John Williams schrieb: I wonder if the use of a vacuum foodsaver (e.g. http://www.tilia.com/ ) would be helpful here? John Williams It is! We use vacuum packages to store PCBs. Also our warehouseman (-right word?) is not to happy with the handling. It a way our baordhouse recomend us to do, and they deliver us our boards this way. Waldemar Kulajew * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Gold or silver plating
Hello, All of the board houses that I have talked to and that are capable of both processes always recommend silver immersion. Any board house can describe both of these processes, pros and cons, more efficient than I can. Here is what I can recall. 1) Silver is natural to the solder process of assembly, gold is not. Gold plating requires another metal. I seem to recall the nickel lowers the temperature to an acceptable level required to solder a component to, but I could be way off on that last statement. 2) All plating tarnishes. HASL, Silver and even Gold. ALL metal oxidizes. 3) A PCB will oxidize if exposed to air. 4) A silver immersed board can repeat the plating process up to five times. Cheers! Drew - Original Message - From: Wayne Bickers [EMAIL PROTECTED] To: Protel EDA Forum [EMAIL PROTECTED] Sent: Monday, April 22, 2002 6:50 PM Subject: [PEDA] Gold or silver plating Sorry this is a little off topic but you guys are the ones who will know. I have 3 issues, 1) I require a smooth finish, hence gold or silver plating/ flashing 2) I need the PCB's to last in stores for a period of time, for arguements sake call it 1 year without oxidising 3) I need to have some pads hand soldered and require a good wetting effect (spreading of the solder when applied) I would appreciate it if anyone out there has tried both and could indicate which may be the better finishing material to use. thanks Wayne Bickers Electronics Engineer Tru-Test Ltd * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
