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

B. Eremiáš, D. Převorovský, V. Janík, J. Faltus

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Zinc-containing copper alloys, the so-called α + β 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, NaNO2, and Na2SO4 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.

Original languageEnglish
Pages (from-to)681-686
Number of pages6
JournalMaterials and Corrosion
Volume58
Issue number9
DOIs
Publication statusPublished - Sep 2007
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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