Chinese Bronze Age dagger

[adrian]

A friend of mine owns this dagger, is was straight when he obtained it & over the years it has bowed quite badly. I examined it & explained that one side is corroding badly & that side is expanding & causing the bend.
He wishes to stabilise it (assuming the damage cannot now be reversed) what is the best treatment to do this? Coat it with wax?
Any advise gratefully received. Adrian