Author/Editor		Milošev, I; Metikoš-Huković, M
Title		Effect of chloride concentration range on the corrision resistance of Cu-xNi alloys
Type		članek
Source		J Appl Electrochem
Vol. and No.		Letnik 29
Publication year		1999
Volume		str. 393-402
Language		eng
Abstract		The anodic behaviour of Cu-xNi alloys and Cu and Ni metals was studied in slightly alkaline solutions containing C1-ions in the concentration range from 0.01 to 2.0 mol dm-3. The morphology and compositon of the surface films formed by anodic polarization were analysed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). On the basis of quasipotentiodynamic polarization data, Ec, against cNaC1 diagrams were constructed, where Ec is the critical pitting potential. These diagrams allow the determination of areas the materials are susceptible to localized pitting attack. A critical chloride concentration (Ccrit) exists below which the resistance to localized corrosion increases with decreasing content and above which it increases with increasing nickel content. This effect is connected with the change in the corrosion resistance observed for the pure metal constitutents, i.e., copper and nickel as a function of chloride concentration. The kinetic parameters of pitting corrosion of Cu-xNi alloys reflect the specific properties of both elements and suggest that an increase in Ni content above 40% would not have a significant effect on the corrosion resistance of Cu-xNi alloys.
Descriptors		CHLORIDES COPPER NICKEL CORROSION