Effect of Zn and Pb contents on the electrochemical behavior of brass alloys in chloride-free neutral sulfate solutions

被引:45
作者
Ismail, KM [1 ]
Elsherif, RM [1 ]
Badawy, WA [1 ]
机构
[1] Cairo Univ, Fac Sci, Dept Chem, Giza, Egypt
关键词
brass; copper; EIS; lead; polarization; sulfate ions; zinc;
D O I
10.1016/j.electacta.2004.06.028
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Different electrochemical methods such as open-circuit potential measurements, polarization techniques and electrochemical impedance spectroscopy (EIS) were used to investigate the electrochemical behavior of brass alloys with various Zn contents (5.5-38.0 mass%) and Cu-38.0Zn-Pb alloy with different Pb contents (1.0-3.4 mass%) in neutral sodium sulfate solutions. The influence of working conditions, e.g., immersion time, sulfate ions concentration and temperature on the electrochemical behavior of the different alloys was also studied. It was found that the initial corrosion rate is relatively high for alloys with the higher zinc content due to dezincification. The dezincification process initiates by selective dissolution of zinc and continues by a simultaneous dissolution of copper and zinc followed by re-deposition of copper. An increase in the lead content and immersion time in the sodium sulfate solution increases the corrosion resistance of the alloy and improves its stability. The stability of the leaded brass was considered to be due to the formation of an insoluble film of lead sulfate on its surface. The impedance data were fitted to theoretical data obtained according to an equivalent circuit model describing the electrode/electrolyte interface. The mechanism of the alloy dissolution was discussed in view of the obtained results. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:5151 / 5160
页数:10
相关论文
共 32 条
[2]  
ARMSTRONG RD, 1974, SPECIALIST PERIODICA, pCH1
[3]   Cyclic voltammetric behaviour of a brass in alkaline media [J].
Assaf, FH ;
Abd El-Rehim, SS ;
Zaky, AM .
BRITISH CORROSION JOURNAL, 2001, 36 (02) :143-150
[4]  
Atkins P.W., 1994, Physical Chemistry, V5th ed.
[5]   THE ELECTROCHEMICAL-BEHAVIOR OF LEADED BRASS IN NEUTRAL CL- AND SO(4)(-) MEDIA [J].
BADAWY, WA ;
ELEGAMY, SS ;
EL-AZAB, AS .
CORROSION SCIENCE, 1995, 37 (12) :1969-1979
[6]   Investigation of corrosion and stability of lead-brass alloy in acid and neutral solutions using electrochemical impedance spectroscopy [J].
Badawy, WA ;
ElEgamy, SS ;
Azab, AS .
CORROSION, 1997, 53 (11) :842-851
[7]   DEPOSITION AND DISSOLUTION OF ZINC IN ALKALINE SOLUTIONS [J].
BOCKRIS, JOM ;
NAGY, Z ;
DAMJANOVIC, A .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1972, 119 (03) :285-+
[8]   INVESTIGATIONS OF THE SEMICONDUCTOR PROPERTIES OF ANODICALLY FORMED PASSIVE LAYERS ON ZN AND OF ZNO SINGLE-CRYSTALS IN DIFFERENT AQUEOUS-ELECTROLYTES BY EIS [J].
BOHE, AE ;
VILCHE, JR ;
JUTTNER, K ;
LORENZ, WJ ;
PAATSCH, W .
ELECTROCHIMICA ACTA, 1989, 34 (10) :1443-1448
[9]   The corrosion of Cu-47.3 at% Zn brass in aerated 1.0 M HCl [J].
Burzynska, L ;
Maraszewska, A ;
Zembura, Z .
CORROSION SCIENCE, 1996, 38 (02) :337-347
[10]   Comparison of the spontaneous and anodic processes during dissolution of brass [J].
Burzynska, L .
CORROSION SCIENCE, 2001, 43 (06) :1053-1069