A low nickel copper alloy commonly used in the plumbing/drainage pipelines on ships was investigated under slow strain rate conditions in air, and in solution containing 3.5%NaCl + 10%MgCl2, with and without 1% ammonia. The tests were conducted at ambient temperature (28 +- 1 deg C) at strain rates corresponding to a crosshead speed of 5.76 x 10-5 cm min-1, without a passivation current. The results obtained did not show any significant deterioration in the mechanical properties of the alloy in the tests conducted in air or in solution without ammonia. However, with the introduction of 1% ammonia, a reduction in the material strength and a change in the mode of failure were observed. The paper discusses the results obtained in the present investigation and in particular the load bearing capacity of the material and the modes of failure in Cu-Ni alloys exposed to sea water. The corrosion products and the fractures were examined in detail by optical microscopy and SEM/EDX techniques.
Effect of ammoniacal sea water on material properties of copper-nickel alloy
Der Einfluss von ammoniakalischem Meerwasser auf die Werkstoffeigenschaften einer Kupfer-Nickel-Legierung
British Corrosion Journal ; 37 , 2 ; 105-113
2002
9 Seiten, 15 Bilder, 2 Tabellen, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
Kupfernickellegierung , Korrosionsversuch , Meerwasser , Natriumchlorid , Magnesiumchlorid , Ammoniak , mechanische Eigenschaft , Korrosionsbeständigkeit , Zugspannung , mechanische Festigkeit , pH-Einfluss , Korrosionsprodukt , Schiffsausrüstung , Rohrleitung , Rasterelektronenmikroskopie , energiedispersive Röntgenspektrometrie , optische Mikroskopie
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