Originally Posted by
velo-orange
DT and Wheelsmith 14gau spokes and nipples have different thread pitches. They are not interchangable- at least this is the way it was for years and years. Maybe that's changed in the past couple years?
HUH!!!, Both Wheelsmith and DT, 14g spokes, along with almost all the spokes sold in the western world over the last half century, have
UNC 2-56 threads (a carryover from when the USA led the world in spoke making and other industrial production) now the ISO standard for 14g spokes.
One exception would be spokes made in France more than 20 years ago, which used the "Jauge de Paris" standard, and had different thread pitch.
The only thread difference between various brands of nipples and spokes is the length of thread, which determines how far up into the nipple a spoke will thread.
As far as the OP's question goes, both black and silver anodized nipples are roughly equal in corrosion resistance. Good quality anodizing offers pretty good corrosion protection and is used in many marine applications, such as sailboat masts, along with all kinds of bike parts. Nickle plated brass is probably the gold standard, but if the threads are greased anodized alloy will hold up very well too.