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Video game cartridge PCB connector and microSD card connector and microSD card the 3 have gold contacts contact how many inserts are needed to remove this golden layer and render the cartridge, SD connector and microSD card useless?
Why does the blades of the SD and microSD connector lose contact pressure? I don't know the manufacturer of my connector but I have some devices purchased on Aliexpress that use a microSD and SD card and connector if I store these devices for many years with the card inserted in the connector will this cause loss of contact with the blades?
Brass and copper contacts are liable to acquire tarnish over time. I think that's more significant than the degree of springy force of the metal. I imagine tarnish can even creep in between the contacts. Thus the advice to reseat a connector if we suspect it's causing a problem. The action of disconnect/reconnect scrapes the metal surfaces against each other, to rub away dirt and uncover clean metal.
Gold doesn't tarnish thus it's desirable for maintaining better contact.
Some metal surfaces are known to 'weld' together after many years, where molecule touches molecule. Example, between Iron or steel, if rust doesn't creep in first.