the nipple and spoke will not sieze, the only thing i can think of that would sieze which really does not involve the spoke is aluminum nipples to al eyelets. But you should be using some sort of lubrication on your spoke threads, spoke prep is popular but expensive. I know Gerd Schraner puts common bicycle oils as he says it on his, lineseed oil is an old and popular lubrication because it does slightly harden a bit, which helps prevent the nipple from backing out.