![]() CuZn21Si3P is a dezincification resistant brass with α + κ microstructure, where κ is a hard Si-rich phase. Silicon brasses with various compositions were developed to induce grain refining and strength increase or to produce non-toxic Pb- and As-free alloys with good machinability and dezincification resistance. According to some authors, the two mechanisms of dezincification are actually both operative on α, α + β’, and β’ brasses under certain conditions of potential and pH. ![]() New stricter regulations introduced in some areas of the world pushed the production of new low-lead or lead-free DZR alloys.Ĭoncerning dezincification of α and α + β’ brasses, two mechanisms were proposed, that is, selective Zn dissolution and a more widely accepted selective dissolution model consisting in the initial dissolution of both Zn and Cu, followed by Cu redeposition. ![]() However, depending on their composition, they may undergo different corrosion forms, such as dealloying and stress corrosion cracking and may determine human health concerns due to lead and, in the case of traditional dezincification resistant (DZR) alloys, arsenic release in drinking water. ![]() Duplex α + β’ brasses are widely used in drinking water distribution systems for tube fittings, parts of pumps, valves, faucets, and ancillaries because they are low cost, easy to fabricate, and exhibit high mechanical strength.
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