I think when they said gold they mean color, because as you said gold doesn't corrode.
Uhhhh, no... "they"
don't just mean colour... they don't and
wouldn't simply choose to describe connectors as 'gold', based merely on aesthetic appearances alone. It
IS about the structural composition of materials used... especially since gold is very known to be quite commonly used in the manufacturing of electronics and circuitry... (especially those of better quality than their more cheaply made counterparts).
So it'd be misleading for a company like Apple to describe their connector material as being "gold" if it weren't actually
comprised of real gold to any degree... (not that I'm say they
wouldn't necessarily do such a thing for monetary gain...
if it were actually the case and
if they could feasibly get away with it... who knows?! But they
wouldn't because of the potential lawsuits & implications involved for false or misleading advertising, whether intentionally or not... but that's moot anyways, because they
are actually made with gold).
In many electronics and circuitry applications gold's quite commonly used to make switches, connectors, contacts, etc... thanks to its excellence & efficiency as a conductor, and
also, as you'd addressed (though not quite accurately, really), because of its excellent and high resistance to corrosion.
So let's set the record straight while on that note... gold is
NOT totally & completely impervious to corrosion! Granted, the instances in which it's possible are really
very slim and so
highly unlikely to occur... that is, under most
normal conditions & environments!
(though I have to interject and point out that moisture on electrical contacts resulting from condensation forming from an overnight cold car environment, that's
then warming up in the morning on one's way to work, for eg... and then subsequently connected to a device --that is, a
live connection while still damp or wet!-- plus
also then possibly subjected to that arcing issue posited--
if that theory is correct, would certainly
NOT in my eyes be considered normal or usual conditions! And who knows what
other metals might also be present with the gold to possibly form a reaction that could possibly cause corrosion?? ..but more on
that point in a bit!)
Anyways, for the most part, yes... gold is generally very highly-
resistant to corrosion... which is precisely why it's often chosen as a reliable material of choice for quality & dependability across a broad spectrum of industrial (or other) applications. And while
not very
likely to corrode, it's also
not impossible either! -- and just to be
extra clear: this is specifically in reference to
pure gold that I'm referring to!
Which leads to the next & main point: here's the caveat which accounts for both your and the other user's confusion in the comment that you were replying to... because (AFAIK), when gold's used in electronics as a conductor, it's
always as a
plating... over top of another base metal. And so the thinness of which, plus the amount of gold used, would vary by application, and also in accordance with
other factors as well (including manufacturing costs)... due in part to the astronomical cost of using pure, solid, gold alone, but
also since pure gold would be far too soft to be very effective or practical to use.
Plus aside from being a
plating and
not pure or solid gold when used in electronics & circuitry (or most
any of its
other industrial applications, for that matter), I'd imagine that gold plating, too,
would also need to be an alloy of sorts... as it's likely too soft of a metal to be feasibly used in its pure form even as a plating (though I
could be wrong about that).
...and not to mention that the
type &
quality of base metal used underneath any given plating, as well as the relative composition & degree of purity of an alloy used for plating --in this case
gold alloy... assuming that my hunch is correct-- would
also vary according to factors like cost & function as well... and so hence,
all of those
other materials & factors would
also determine or affect a "gold" connector's durability & resistance to corrosion!!
Sooo, hopefully this should clear up
that confusion about this issue!.. lol
