Copper protection against high temperature corrosion

[hgjor]

I would like to use copper as heat exchanger at temperatures up to 450°C, but I noticed severe temperature corrosion. Next I tried the copper plated with nickel, but the nickel seems to come loose near sharp edges and the surface is heat stained.
Is there a better treatment, or should I replace the copper by another metal (alloy) with high thermal conductivity ?
Many thanks for your reply,
Herman

[Gordon]

Hi Herman

to the Surface Engineering Forum.

Thermal spray coating of Ni5Al alloy or may be pure aluminium?

Changing material to aluminium bronze or copper nickel alloy?