Solid-state diffusion during the selective dissolution of brass: chronoamperometry and positron annihilation study

Zou, Jin-Yun; Wang, Dihua; Qiu, Wan-Chuan

doi:10.1016/s0013-4686(96)00373-8

Cited by 34 publications

(21 citation statements)

References 9 publications

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“…The steady state observed during the last stages of exposure was attributed to the formation of stable corrosion products. The compounds identified by X-ray analysis indicate the presence of Cu 2 O, Cu, Cu 2 Cl (OH) 3 in the acidic medium. At pH 7, V ARPR decreases rapidly during the first three cycles then more slowly up to the fourth cycle and eventually attains a steady state during the last five cycles.…”

Section: Resultsmentioning

confidence: 97%

“…A protective corrosion product is formed during last stages of monitoring due to the re-deposition of copper corrosion products (Cu 2 O, Cu, and Cu 2 Cl (OH) 3 ), which cover the entire surface, leading to a decrease in corrosion rate. The outermost part of the corrosion product layer is poor in zinc, due to the initial rapid leaching of zinc [21,34].…”

Section: Mechanism Of Brass Corrosion During Wet-dry Cycling Conditionsmentioning

confidence: 99%

“…An increase in chloride concentration produces a substantial decrease in the passive potential and promotes pitting corrosion. The anodic dissolution of b -brass was investigated by using chronoamperometry in Na 2 SO 4 , NaCl and H 2 SO 4 solutions at 30°C [3]. The corrosion behavior of brass in 0.1 M NaCl solution was investigated using Voltametry [4].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical impedance study on brass corrosion in NaCl and (NH4)2SO4 solutions during cyclic wet?dry conditions

El-Mahdy

2005

J Appl Electrochem

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Atmospheric corrosion of brass in sodium chloride (NaCl) and ammonium sulfate (NH 4 ) 2 SO 4 solution during wet/dry cyclic conditions was investigated. The effects of various parameters on the corrosion rate were studied including temperature, pH and surface inclination. The polarization resistance of brass samples, subjected to 1 h immersion and 7 h drying at 60% RH was monitored using an AC impedance. The corrosion rate measured at low temperature was found to be significantly lower than that observed at high temperature. The average reciprocal polarization resistance (V ARPR ) was also calculated during exposure. It decreased with the number of exposure cycles during the initial stages and attained a steady state value during the last stage of exposure. An atmospheric corrosion mechanism for brass, describing the successive stages during exposure, is subsequently proposed.

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Section: Resultsmentioning

confidence: 97%

Section: Mechanism Of Brass Corrosion During Wet-dry Cycling Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical impedance study on brass corrosion in NaCl and (NH4)2SO4 solutions during cyclic wet?dry conditions

El-Mahdy

2005

J Appl Electrochem

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“…At the same time, surface enrichment in copper leads to diffusion of copper in the opposite direction. Previous studies showed that the solid state diffusion of zinc occur via di-vacancies created on the corroding surface with a diffusion coefficient in the order 10 À15 ± 10 À13 cm 2 s À1 [7]. The galvanic action accelerates the solid state diffusion rate by the rapid removal of the surface zinc and creation of di-vacancies (process VI).…”

Section: The Proposed Dezincification Modelmentioning

confidence: 99%

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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“…In each of these areas of brass exploitation, there are factors that cause the alloy to undergo corrosion destruction, most often beginning with a selective dissolution of zinc [1][2][3][4][5][6][7][8][9][10]. One of the scientifically substantiated and economically expedient methods of protecting brass from corrosion is to use inhibitors, and azoles are found to be the most efficient.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of Brass (80/20) by 5-Mercaptopentyl-3-Amino-1,2,4-Triazole in Neutral Solutions

Arkhipushkin

Shikhaliev

Potapov

et al. 2017

Metals

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Abstract:The effect of the adsorption of 5-mercaptopentyl-3-amino-1,2,4-triazole (MPATA) on the corrosive behavior of brass (Cu80/Zn20) in neutral (pH 7.4) borate buffer solutions with and without 0.01 M NaCl was studied. Electrochemical methods show significant decrease of the anodic and cathodic currents on the polarization curves in the presence of MPATA. X-ray photoelectron spectroscopy (XPS) reveals MPATA adsorption on the brass surface from an inhibitor solution. After 17 h of exposure, a mixed complex [Cu x Zn y MPATA z ] with a thickness of about 3-3.5 nm is formed on the surface. This nanolayer has sufficient protective ability to withstand corrosion tests in a salt fog chamber: after 5 days of testing, the samples remain glossy and less than 1% of the surface has been damaged. After corrosion tests in a salt fog chamber, the surface of unprotected samples is enriched with zinc, while at the surface of inhibitor-treated samples, the copper and zinc are present in practically equal contents.

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Solid-state diffusion during the selective dissolution of brass: chronoamperometry and positron annihilation study

Cited by 34 publications

References 9 publications

Electrochemical impedance study on brass corrosion in NaCl and (NH4)2SO4 solutions during cyclic wet?dry conditions

Electrochemical impedance study on brass corrosion in NaCl and (NH4)2SO4 solutions during cyclic wet?dry conditions

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

Inhibition of Brass (80/20) by 5-Mercaptopentyl-3-Amino-1,2,4-Triazole in Neutral Solutions

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