Cu-Zn alloys containing more than 15% Zn are susceptible to a dealloying process called Dezincification where the selective removal of Zn leaves a relatively porous and weak layer of Cu and Cu oxide. Corrosion of a similar nature continues beneath the primary corrosion layer resulting in gradual replacement of sound brass by weak, porous copper. Unless arrested this corrosion mechanis... https://www.neximalloys.com/c35330-dzr-brass-profiles-manufactures-exporters-suppliers-stockists.html