Chemical composition of new copper alloys for machining and its effect on their susceptibility to corrosion cracking

Abstract

Zinc-containing copper alloys, the so-called a þ b brasses, are commonly used in contact with potable water. These materials are alloyed with lead to improve machinability. In wrought special brass alloys, reducing the content of this alloying element or replacing it with alternative alloying additions may give rise to a new type of machinable copper alloys which differ from the original alloys by their contents of other modifier elements such as Si (or possibly, Mg, Bi, and P). These alloys have a very low content of lead required for the break-up of chips during machining. Even though these types of brass exhibit a very good machinability, the effects of their chemical composition on the resistance of the alloy to corrosion cracking have not yet been given sufficient attention. This paper aims to present an assessment of three new types of machinable copper alloys regarding their susceptibility to stress corrosion cracking, in comparison to that of the lead-alloyed variety, in 0.05 M NaCl, NaNO 2 , and Na 2 SO 4 solutions. The slow strain rate test has been used for this purpose, and its results were correlated with metallographic evaluation of the number and depth of the cracks observed on the test specimen surfaces on completion of the test.

Corrosion Behavior and Susceptibility to Stress Corrosion Cracking of Leaded and Lead-Free Brasses in Simulated Drinking Water

“…Silicon brasses with various compositions were developed to induce grain refining and strength increase [ 11 ] or to produce non-toxic Pb- and As-free alloys with good machinability [ 12 ] and dezincification resistance [ 8 ]. CuZn21Si3P is a dezincification resistant brass with α + κ microstructure, where κ is a hard Si-rich phase.…”