Many years ago I brought a Cobra (like a 16ft mossie) After 15 mins of sailing we snapped the mast. The new mast was not anodised. So I got a tube of metal polish and polished it from top to bottom! Took a while, went over it a few times and it looked a lot like a chrome finish.

Caught up with the boat recently, (mast was replaced in 1993) while most of the boat looks pretty delapidated the mast is still shiney and shows no signs of corrosion.

cost about $10 and a couple hours of elbow greese.

HTH