A comparative study on the passivation and localized corrosion of α, β, and α + β brass in borate buffer solutions containing sodium chloride—I. Electrochemical data

Morales, J.; Fernandez, G. T.; Esparza, P.; González, S.; Salvarezza, Roberto Carlos; Arvía, Alejandro Jorge

doi:10.1016/0010-938x(94)00108-i

Cited by 66 publications

(37 citation statements)

References 18 publications

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“…The voltammogram obtained with a Zn electrode under static conditions (Figure 4) in 0.1 mol L -1 Ac shows an abrupt current increase when the potential is shifted positively. The reverse potential scan presents a small cathodic peak at -0.8V, which can be assigned to the electroreduction of Zn +2 , taking place simultaneously with the HER 4 .…”

Section: Resultsmentioning

confidence: 98%

“…The electroreduction processes involving cuprous and cupric species originate the peaks at -0.25V and -0.48V. The peak at -0.90V is assigned to the Zn electroreduction and the HER 4 . These voltammograms indicate that the structure and/or composition of the anodic layer is dependent on the acetate concentration.…”

Section: Resultsmentioning

confidence: 99%

“…The obtained data indicate that the corrosion of α-brass is remarkable and resulted in the depletion of Cu, whereas the (α+β)-brass revealed galvanic dezincification 3 . In alkaline media Morales et al 4 found that the corrosion resistance increases in the following order (α+β)-brass ≅β-brass < α-brass.…”

Section: Introductionmentioning

confidence: 99%

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Electrodissolution of Cu-Zn alloys in acetate media

Machado¹,

Schmidt²,

Azambuja³

2000

J. Braz. Chem. Soc.

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A eletrodissolução de ligas de Cu-Zn, de diferentes composição química (CuZn37 e CuZn39Pb3) foi estudada em solução tampão de acetato, pH 5, através de medidas de potencial de circuito aberto e voltametria cíclica, sob condições estáticas e dinâmicas. A menor resistência à corrosão detectada nestas ligas, comparativamente ao Cu puro, foi atribuída à estrutura da camada anódica formada ZnO.x H 2 O /Cu 2 O-CuO, a qual apresenta menor proteção que a camada Cu 2 O-CuO, formada sobre o eletrodo de Cu puro. Não foi observada a dissolução seletiva do Zn, verificando-se a dissolução simultânea dos constituintes das ligas. A velocidade de eletrodissolução das ligas neste meio, mostrou-se superior à do Cu puro e inferior à do Zn puro .The eletrodissolution of Cu-Zn alloys with different chemical compositions (Cu37Zn and Cu39Zn3Pb) in acetate buffer pH 5 was studied by means of corrosion potential measurements and cyclic voltammetry, under static and dynamic conditions. The lower corrosion resistance of the brass in comparison to pure Cu, was attributed to the anodic layer structure consisting of a complex ZnO.x H 2 O /Cu 2 O-CuO layer, which is less protective than the Cu 2 O-CuO passive layer produced onto Cu. No selective dissolution of Zn was detected at both alloys, being their electrodissolution rate higher than that of pure Cu and smaller than that of pure Zn.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Electrodissolution of Cu-Zn alloys in acetate media

Machado¹,

Schmidt²,

Azambuja³

2000

J. Braz. Chem. Soc.

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“…The more cathodic peak potential varies with increasing buffer concentration from À0.27 V to À0.50 V. This peak corresponds to the formation of a copper(I) oxide ®lm on the surface of the microparticles [26]. The corresponding formal potential (pH 9.2, 0.1 M buffer concentration) is E 0 7 0.267 V (vs. Ag=AgCl).…”

Section: Coppermentioning

confidence: 96%

Electrochemical Behavior of Silver-Copper Alloys in Voltammetry of Microparticles: A Simple Method for Screening Purposes

et al. 2001

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“…Passivation in slightly alkaline solution, with and without addition of chloride, has not received much attention [15][16][17][18][19][20]. The passivation behaviour of brasses under these conditions is interesting since the passivation of the copper and zinc components occurs at a pH value of 9 [21].…”

Section: Introductionmentioning

confidence: 99%

Passivity and Corrosion of Cu–xZn (x = 10–40 wt%) Alloys in Borate Buffer Containing Chloride Ions

2005

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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, E b , 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 E b = a+b log c NaCl 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.

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A comparative study on the passivation and localized corrosion of α, β, and α + β brass in borate buffer solutions containing sodium chloride—I. Electrochemical data

Abstract: The passivation and localized corrosion of a-,

Cited by 66 publications

References 18 publications

Electrodissolution of Cu-Zn alloys in acetate media

Electrodissolution of Cu-Zn alloys in acetate media

Electrochemical Behavior of Silver-Copper Alloys in Voltammetry of Microparticles: A Simple Method for Screening Purposes

Passivity and Corrosion of Cu–xZn (x = 10–40 wt%) Alloys in Borate Buffer Containing Chloride Ions

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