Dealloying

Question 1

Graphitization of cast iron`

Answer 1

can cut the surface with a knife

Question 2

Dezincification of brass

Answer 2

surface turns yellow

Question 3

What is the dezincification mechanism?

Answer 3

> zinc, the more active element, selectively dissolves out of brass, leaving behind a weak, porous copper structure
both copper and zinc dissolve, and the more noble Cu redeposits as a porous layer
both processes occur as separate and overlapping regimes