The ones here with corrosion issues might live in a place where there is something in the air? Chemical plant? Whatever gets put on the roads to melt ice?
I've had my bike for just over a year and have no such issues, and unless there's ice on the roads or raining (not putting my rain gear on to ride 20mi to work) I ride all the time. Even after riding up to Seattle last fall in the perpetual mist there is no sign of corrosion. Could it be cleaning agents?