Hello Manfred, Just type in your search engine (I use BING) Bi Metal Washers. There are many manufacturers and suppliers to choose from. About 20 years ago, when I was working in the electrical field, we order these devices from a electrical supply house.
The washer to be use, will depend on the two different alloys to be connected together. To connect aluminum to copper, the washer may be a steel, brass, copper or a aluminum washer which has aluminum plated on one side and copper on the other side. You can also get bi-metal wire terminals or buss bars that is plated with the same alloy on both sides that can contact any other alloy without any deteriorations. The terminals will have a AL-CU stamp on them for connecting to either aluminum or copper devices. Roland ----- Original Message ----- From: Manfred Bartz<mailto:[email protected]> To: Electric Vehicle Discussion List<mailto:[email protected]> Sent: Tuesday, January 14, 2014 11:22 PM Subject: Re: [EVDL] Dissimilar Metal Contact on LiFePO4 Battery Posts Roland, thanks for that info, nice find. Performix Plastic Dip Rubber Coating: http://www.plastidip.net.au/category/plasti-dip-500ml<http://www.plastidip.net.au/category/plasti-dip-500ml> Bimetal washers seem to be a bit harder to find... Could you post a link? - Manfred On 15 January 2014 02:09, Roland <[email protected]<mailto:[email protected]>> wrote: > The interface washers that is place between aluminum and copper conductors that we use have a AL-Cu stamp on them, meaning these bi-metal devices are approved for this type of work. > > Aluminum electrical fittings actual are plated with a bi-metal compound that is the same color as the aluminum. They look like a aluminum fitting with this bi-metal plating. > > Copper fittings are also plated with this bi-metal compound which may be zinc or cadmium or sometimes call Chrome-Cad. We use Chrome-Cad. plated steel channels and electrical suspension structures which is use in expose switch gears and overhead electrical structures. > > The Chrome-Cad. plating over steel is less resistance than steel where the electrical current flows over the surface of the structure. The plating has a golden color to it. > > You can purchase electrical fittings that has these bi-metal separators install in them or you can purchase bi-metal washers. We use Thomas and Betts electrical fittings that uses bi-metal devices or are bi-metal surface plated. > > Before I install the battery connection and/or links, I coat the positive end with a Red rubber and the negative end with Black rubber compound which is electrical, acid and oil resistance which I purchase from a electrical supply house. It sometimes call liquid electrical tape. > > Latter I found that the liquid tool handle compound which is use to insulated tools also work. In purchasing this type of compound, make sure you read the label that it listed for electrical resistance, acid, and oil proof. I use Performix Plastic Dip Rubber Coating. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA<http://groups.yahoo.com/group/NEDRA>) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140115/0f3e093a/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
