Author/Editor		Kosec-Mikić, T; Milošev, I; Pihlar, B
Title		Passivity and corrosion of Cu-xZn (x=10-40 wt%) alloys in borate buffer containing chloride ions
Type		članek
Source		J Appl Electrochem
Vol. and No.		Letnik 35
Publication year		2005
Volume		str. 975-84
Language		eng
Abstract		The electrochemical behaviour of Cu-xZn alloys and of Cu and Zn metals was studied by cyclic voltammetry and chronopotentiometry in borate buffer, pH = 9.2, with and without the addition of chloride ions in the range from 0.01 M to 1 M. In general, the shape of voltammograms of four Cu-xZn alloys with 10 - 40 wt.% of zinc resembles that of copper more than that of zinc. With increasing zinc content several characteristics of zinc are observed. In borate buffer containing chloride anions, Cu-xZn alloys are susceptible to pitting corrosion. The breakdown potential, Eh, at which the current density in the passive region starts to increase abruptly, becomes more negative with increasing zinc content in the alloy. The general relationship Eb = a+b log cNacl, held in all cases, with constants a and b, however, being dependent on the zinc content of the alloy and on the chloride concentration. The corrosion resistance of Cu-xZn alloys was less than that of copper metal but significantly greater than that of zinc.
Descriptors		COPPER ZINC ALLOYS MATERIALS TESTING CORROSION BUFFERS BORATES CHLORIDES ELECTROCHEMISTRY