I was about to send the same reply. 7075 is more vulnerable than most aluminum to filiform corrosion (it separates into layers) under fasteners (because small amounts of water get trapped there). For the large cross sections and thicknesses we use, 6061 is just fine. Mine was just fine when I took it off to service the motor and change the clutch after at least 3 years (maybe longer, I don't know all the history of this vehicle) as an EV.
-----Original Message----- From: Thomas Shay [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 03, 2002 9:55 PM To: [EMAIL PROTECTED] Subject: Re: coupler material ----- Original Message ----- From: "Gary Graunke" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, October 03, 2002 6:43 PM Subject: Re: coupler material > Incidently, I used type 6061 T561 aluminum for the adaptor plate. It has > worked well for Victor, but the machinist suggested that type 7075 would > have been a more optimal choice. I was hoping to get some input from the > list before starting, but, unfortunately, it was down. So I'll rely on their > experience, but it would be nice to add this to the wealth of information > that is this list. 7075 is an aircraft structural alloy. It has high strength and hardness, good machineability. It has poor weldability and poor resistance to corrosion. I would be a bit concerned about its poor resistance to corrosion in your application and wouldn't use it for that reason 6061 has excellent resistance to corrosion and is a good choice for your adapter plate. Tom Shay IMPORTANT - THIS MESSAGE (INCLUDING ANY ATTACHMENTS) IS INTENDED ONLY FOR THE USE OF THE INDIVIDUAL OR ENTITY TO WHICH IT IS ADDRESSED, AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, CONFIDENTIAL AND EXEMPT FROM DISCLOSURE UNDER APPLICABLE LAW. IF YOU ARE NOT THE INTENDED RECIPIENT, YOU SHOULD DELETE THIS MESSAGE IMMEDIATELY AND YOU ARE HEREBY NOTIFIED THAT ANY READING, DISSEMINATION, DISTRIBUTION OR COPYING OF THIS MESSAGE, OR THE TAKING OF ANY ACTION BASED ON IT IS STRICTLY PROHIBITED. THANK YOU.
