Chemical composition of new copper alloys for machining and its effect on their susceptibility to corrosion cracking
Eremiáš, B., Převorovský, D., Janik, Vit and Faltus, J.. (2007) Chemical composition of new copper alloys for machining and its effect on their susceptibility to corrosion cracking. Materials and Corrosion, Vol.58 (No.9). pp. 681-686. ISSN 0947-5117
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Official URL: http://dx.doi.org/10.1002/maco.200704054
Zinc-containing copper alloys, the so-called aþb 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.
|Item Type:||Journal Article|
|Subjects:||T Technology > TN Mining engineering. Metallurgy|
|Divisions:||Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)|
|Journal or Publication Title:||Materials and Corrosion|
|Publisher:||Wiley - V C H Verlag GmbH & Co. KGaA|
|Official Date:||October 2007|
|Page Range:||pp. 681-686|
|Access rights to Published version:||Restricted or Subscription Access|
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