Stuck alu seatpost in carbon frame

Well done ! I too have an old Look frame with an alu seatpost. So when I first read this thread I checked it as I've not touched the seatpost in about 4 years, so undid it and yes it's stuck !

Luckily it's stuck at the right height.

I think I read somewhere that if you get your seat post anodised, it prevents corrosion in the carbon frame. Whatever anodising is.