Realise this is quite an old topic, but I had exactly the same. The kitchen isn't the driest place, but the Bosch Appliances that sit next to the Fridge Freezer are perfect, no paint problems at all.
The surface rusting only appears on the front doors not on the sides or back, top of the appliance. I think Zanussi/Electrolux were experimenting with Green Toxic Free Paint Processes, which obviously didn't work.
At the time the rest of the stuff I bough was Bosch, Washing Machine, Tumble Dryer (2003) which has been fantastic. The Fridge now looks disgusting externally - and its putting me off my food. It still works, but cosmetically everything has gone wrong- handles have cracked - all shelving on inside door has cracked/broken.
Won't be buying Zanussi again thats for sure.