Rusty Shimano XT Pedals

Hi All
Had XT pedals on my bike for the last 6 months, all the cleat plates, tension springs and axles have major rust on them. It's an expensive bike, I think I do a pretty good job looking after it, no other rust on the bike, my other cheapo bike has M520's had it for 2 years, usally ride it when thing are wet, don't look after it that well, M520 not a speck of rust on them, a third of the price of the XT's, in this case I don't think you get what you pay for. Anyone else having this problem? maintenance tips?

Cheers