Sorry, I should have clarified it as "eventual" spoke pull-through. It would have to be a spectacularly rubbish rim for spokes to pull through during the build process.
A lot of rims show powdery corrosion around stainless eyelets after a while (especially visible on black ones) but I've never personally seen this progress to actual pull-through. It may just be that the eyelet frets at the aluminium and prevents passivation.
That kinda corrosion is named "galvanic" corrosion. Metals have a so called degree of nobility, where a more "noble" metal corrodes a less noble metal, on condition of the presence of an elektrically conducting medium (electrolysis). The least noble metal gets dissolved, hence the powder.
The degree of the corrosion depends on the electrical current intensity and thus on the individual masses of the individual metals. For ex, the case of a stainless eyelet in an aluminium rim, the aluminiums mass is much bigger than the stainless steel mass, which makes the corrosion least worse.
But if you have a long stainless bolt through a small aluminium block, the corrosion is worst.
I had this latter problem with my new bicycle, at some point the stud of the bicycle required retensions and this became worser and worser, upto the point that I had to retension several times in an hour in the case of a market with alot stops. In the end, I decided to dismount it to find any explanation, and the holes of the two stainless steel bolts were filled with white powder. On the bolts and counternuts I saw A2-70.
The bicycles producent apparently wasn't aware of this galvanic corrosion, chosed stainless steel in an attempt to do good, but instead did worse.
I solved it by replacing the stainless bolts with normal steel bolts, and kept these well oiled to avoid normal corrosion. But since, the stud has quite some wiggling room. The stainless steel corroded the inbetween block but also the frame holes. Hard to solve.
