Does Galvanized rust over time

I have a CI run with a female stub for my kitchen DW.

Under the sink, I plan to use schedule 40 pvc or 17 AWG tubular grass depending on how I mate onto the CI fitting.

Does galvanized pipe rust/degrade/corrode over time - even if it's a short nipple - 3-4" ? If I use the galv nipple, I would then use a fernco fitting to adapt to the tubular brass.

Otherwise, I will just use a female PVS adapter piece on the CI, do schedule 40 for the drain trap, and call it a day.

Given a choice, I'd avoid galvanized pipe all together. It does rust and corrode, that's why it's not used for water lines anymore. If the CI fitting has threads, I just use an adapter to transition to PCV.

Any scratch or imperfection in the galvanized coating will expose the steel to allow rust (threads will do it - most of the time the coating is put on before the threads are cut)...it can get so bad that it basically closes off the inside of the pipe. It will happen, just depends on conditions how long it takes.

I would use a stainless steel nipple or a brass "marvel adapter"

Jeff

Yes - I've had to replace several, I install PVC instead.