A comparative study on the passivation and localized corrosion of α- and β-brass in borate buffer solutions containing sodium chloride—II. X-ray photoelectron and Auger electron spectroscopy data

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

doi:10.1016/0010-938x(94)00109-j

Cited by 57 publications

(32 citation statements)

References 6 publications

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“…It can be seen that in the case of the CuZn system, these reduction peaks are somewhat shifted to lower potentials and are less distinct, however, it is clear that Q1 corresponds to the reduction of Cu(II), Q2 to the reduction of Cu(I) and Q3 to the reduction of Zn(II). These data are in agreement with those reported by Morales et al [19,20], who observed a potential shift in the reduction of Cu(II) and Cu(I) for various brasses.…”

Section: Resultssupporting

confidence: 93%

“…5, which were obtained following a 90-min immersion period, that the oxide layers existing under opencircuit conditions contain a relatively large amount of copper oxides. However, the outer layers will contain ZnO as shown by Morales et al [19,20] and the concentration of ZnO will be higher during the early stages of immersion. It is well known that ZnO is an n-type semiconductor [12 -15].…”

Section: Discussionmentioning

confidence: 98%

“…Morales et al [19,20] have shown, using XPS, that the passive layer formed on various brasses in a pH 9 borate solution consists of a complex ZnO · xH 2 O/ Cu 2 O -CuO layer. The ZnO electro-formation results in a dezincification process so that a thin copper-rich layer resides at the metal/oxide interface.…”

Section: Discussionmentioning

confidence: 99%

“…However, it has also been shown, using electrochemical and surface analytical techniques, that the passive layers formed on CuZn in neutral and alkaline solutions consist of a complex combination of ZnO · xH 2 O and CuO 2 /CuO phases [19,20].…”

Section: Introductionmentioning

confidence: 99%

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The electrochemical behaviour of CuZn under conditions of illumination

Rudd

Breslin

2000

Electrochimica Acta

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The influence of UV illumination on the passive behaviour of Cu37Zn in pH 9.2 and 13.0 chloride-containing electrolytes was studied using potentiodynamic polarisation tests, cyclic voltammetry and complex impedance spectroscopy. It was found that UV illumination exerted a slight activating effect on the passive behaviour in the alkaline pH 13.0 solution, with slightly higher passive current densities being recorded under conditions of illumination. A more pronounced UV illumination effect was observed in the pH 9.2 solution. This was characterised by a 4-fold increase in the passive current density, a shift in the breakdown potential by 250 mV in the active direction, a decrease in the charge transfer resistance and an increase in the double layer capacitance. These results are explained in terms of the nature of the passive film on CuZn, which consists of a complex layer involving ZnO · xH 2 O and Cu 2 O/CuO. On illumination, photo-decomposition of the n-type ZnO phase occurs leading to a modification of the passive layer rendering it more susceptible to pitting attack in the chloride environments.

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Section: Resultssupporting

confidence: 93%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The electrochemical behaviour of CuZn under conditions of illumination

Rudd

Breslin

2000

Electrochimica Acta

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“…As mentioned above, the XPS Zn2p 3/2 peak for metallic state is undistinguishable from that of Zn 2+ [30][31][32][33][34][35][36][37][38]. In such cases, ZnLMM Auger transitions induced by X-ray radiation (Fig.…”

Section: Resultsmentioning

confidence: 67%

Electrochemical and XPS study of 2-merсaptobenzothiazole nanolayers on zinc and copper surface

Arkhipushkin¹,

Pronin²,

Vesely³

et al. 2014

Int. J. Corros. Scale Inhib.

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The electrochemical behavior of copper and zinc in neutral (рН 7.4) borate buffer solution with addition of 0.5 M NaCl and the effect of 2-merсaptobenzothiazole (MBT) on the electrochemical processes and adsorption on these metals has been studied by means of electrochemistry and X-ray photoelectron spectroscopy (XPS). The formation of MBTmetal cation complex films on copper and zinc surface has been shown. The effect of corrosive media composition and time-dependent relations of nanoscale film growth on the surface of the metals investigated have been determined. It was assumed that adsorbed MBT anion forms M(MBT) х , a polymeric complex where M = Cu + (x = 1) or Zn 2+ (x = 2).

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A model for prolonged dezincification ofα-brasses in 3% sodium chloride buffer solutions at different pH values

Rehan¹,

Al-Moubarak²,

Alrafai³

2001

Materials and Corrosion

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Dezincification behaviour of three commercial α‐brasses (33–37% Zn) in acetate buffer solutions containing 0.5 M sodium chloride was studied by weight loss, solution analysis and electrochemical polarization over a period of time extended for four weeks. The corrosion behaviour in the same solutions without chloride was also studied to explore the role of chloride in the dezincification. The presence of chloride led to a severe dezincification, which increased as time increased in contrast to chloride‐free solutions. The corrosion rate, however, was insensitive to the presence of chloride. The dezincification factor in chloride solutions increased in the order: pH 7.0 < pH 8.5 < pH 2.4 (order of increasing Zn dissolution rate) while the corrosion rate followed the order: pH 8.5 < pH 7.0 < pH 2.4 (order of increasing O2 and H+ reduction rates). Corrosion and dezincification was not a simple function of % Zn in the alloy. A model was proposed to explain the autocatalytic dezincification in chloride solutions and important elements in the model are: the production, disproportionation and redeposition of cuprous chloride complexes, growth of a spongy copper layer on the corroding alloy and establishment of an increasing number of microgalvanic cells.

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A comparative study on the passivation and localized corrosion of α- and β-brass in borate buffer solutions containing sodium chloride—II. X-ray photoelectron and Auger electron spectroscopy data

Cited by 57 publications

References 6 publications

The electrochemical behaviour of CuZn under conditions of illumination

The electrochemical behaviour of CuZn under conditions of illumination

Electrochemical and XPS study of 2-merсaptobenzothiazole nanolayers on zinc and copper surface

A model for prolonged dezincification ofα-brasses in 3% sodium chloride buffer solutions at different pH values

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