Passivity breakdown and stress corrosion cracking of α-brass in sodium nitrate solutions

Fernandez, Sammie; Alvarez, M.G.

doi:10.1016/j.corsci.2010.09.025

Cited by 28 publications

(25 citation statements)

References 32 publications

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“…The results were consistent with those of Heidersbach and Verink 23 who proposed that preferential dissolution of Zn occurred at low potentials, while for higher potentials, both copper and Zn dissolved with or without copper re-deposition depending on the potential value. They were also in good agreement with other authors 20,[24][25] who showed that the precipitation of lead based compounds on the surface of the brass, for potentials higher than the corrosion potential, decreases the extent of corrosion attack. Results from a previous study 16 brought a new insight into the chemical composition of the surface layer depending on the pH and the applied potential.…”

supporting

confidence: 92%

“…[17][18][19] The NaNO 3 solution was selected on the basis of a literature review on α-brass. 20 In the literature, the solutions that are most often used are ammonia, 15,21 sulfuric acid, 22 and nitrite solutions 10 but, according to Fernandez et al, 20 the nitrate ion is far more stable in low pH solution than the nitrite ion. Because the present study was a first step to develop an accelerated SCC test, the nitrite ion was avoided due to its instability in the acid solution that is expected to exist inside a stress corrosion crack.…”

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confidence: 99%

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Dissolution Kinetics of α,β^′-Brass in Basic NaNO₃Solutions

Berne

Andrieu

Reby

et al. 2015

J. Electrochem. Soc.

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Corrosion tests at a constant anodic potential, referred to as dissolution tests, were performed to determine the dissolution kinetics of an α,β′-brass CuZn40Pb2 (CW617N) in a basic nitrate solution with and without mechanical loading. The corrosion behavior of the α,β′-brass was characterized by a two-step mechanism, with an initiation step for which the simultaneous dissolution of all the alloying elements of the β′ phase occurred only and a propagation step including at first, the afore-mentioned simultaneous dissolution process before a critical time tc and then, both simultaneous dissolution and dezincification of the β′ phase after tc. The pH and Cu concentration of the electrolyte near the brass surface were determined to be two of the major factors influencing the occurrence of the dezincification process. The dezincification of the β′ phase extended in depth by a percolation dissolution mechanism. Mechanical loading during the dissolution tests was observed to largely influence the dezincification process. It was assumed to open or close the pores present in the dezincified β′ phase, which promoted or slowed down the dezincification mechanism depending on the sign of the stress.

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confidence: 92%

mentioning

confidence: 99%

Dissolution Kinetics of α,β^′-Brass in Basic NaNO₃Solutions

Berne

Andrieu

Reby

et al. 2015

J. Electrochem. Soc.

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“…This was in agreement with previous studies on α-brass. 23 The differences in the chemical composition and structure of the surface layer depended on the pH, with a higher dezincification process, for pH 12 solutions compared to pH 11 solutions, leading to a more porous structure of the brass surface as suggested by Pickering et al [28][29][30] Concerning the selective dissolution of the Zn present in the β phase, the Pourbaix diagram for Zn shows that Zn stability decreases when the pH increases. Zn(OH) 2 is the most stable species until pH 10.…”

Section: Influence Of the Applied Potential On The Dissolution Mechanmentioning

confidence: 99%

“…Electrochemical measurements were performed in NaNO 3 solutions selected on the basis of a literature review on α-brass. 23 In the literature, the solutions that are most often used are ammonia, 14,[24][25] sulfuric acid, 15,[26][27] and nitrite solutions 9 but, according to Fernandez et al, 23 the nitrate ion is far more stable in low pH solution than the nitrite ion. Because the present study was a first step to develop an accelerated SCC test, nitrite ion was avoided since it was unstable in the acid solution that is expected to exist inside a stress corrosion crack.…”

mentioning

confidence: 99%

The Electrochemical Behavior of α,β^′-Brass in Basic NaNO₃Solutions

Berne¹,

Andrieu²,

Reby³

et al. 2015

J. Electrochem. Soc.

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The electrochemical behavior of an α,β -brass CuZn40Pb2 (CW617N) was studied in basic nitrate solutions with various basic pHs and nitrate ion concentrations. In all the chosen experimental conditions, corrosion at the open circuit potential proceeded by the galvanic coupling of the α and β phases, leading to a surface dezincification of the β phase. The study showed that the extent of the dezincification was affected by the presence of lead in the alloy but the pH was the major parameter. During polarization tests, a pseudo-passive or a passive stage followed by a breakdown was observed: corrosion phenomena mainly involved copper and zinc dissolution from the β phase. At pH 11, a Cu 2 O/PbO layer was efficient in achieving passivity of the brass. At pH 12, a Cu(OH) 2 -rich surface layer was formed: it was not protective enough, and complete dissolution of the β phase was observed leading to the removal of lead particles.

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“…Copper and alloys are widely used in various industrial plants due to their mechanical characteristics, good thermal and electrical conductivity and relatively good corrosion resistance in different aggressive environments [1][2][3]. Hence, electrochemical behaviour of brass in sea water [1,4], in solutions containing chloride and sulphate ions [5][6][7], as well as in nitrate and nitrite media [8,9] is studied. Brass protection in aggressive media is related to the formation of a stabile protective film on metal surface composed of copper and zinc oxide.…”

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confidence: 99%

2-Amino-5-ethyl-1,3,4-thiadiazole as inhibitor of brass corrosion in 3% NaCl

Radovanović¹,

Mihajlović²,

Antonijević³

2016

Metall Mater Eng

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The electrochemical behaviour of brass and anticorrosion effect of 2-amino-5- ethyl-1,3,4-thiadiazole (AETD) in chloride solution was investigated using electrochemical techniques. Results show that inhibition efficiency depended on inhibitor concentration and immersion time of brass electrode in inhibitor solution. Mechanism of brass corrosion inhibition by 2-amino-5-ethyl-1,3,4-thiadiazole includes adsorption of inhibitor on active sites on electrode surface. Adsorption of AETD in 3% NaCl solution obeys Langmuir adsorption isotherm.

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Passivity breakdown and stress corrosion cracking of α-brass in sodium nitrate solutions

Cited by 28 publications

References 32 publications

Dissolution Kinetics of α,β^′-Brass in Basic NaNO₃Solutions

Dissolution Kinetics of α,β^′-Brass in Basic NaNO₃Solutions

The Electrochemical Behavior of α,β^′-Brass in Basic NaNO₃Solutions

2-Amino-5-ethyl-1,3,4-thiadiazole as inhibitor of brass corrosion in 3% NaCl

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Passivity breakdown and stress corrosion cracking of α-brass in sodium nitrate solutions

Cited by 28 publications

References 32 publications

Dissolution Kinetics of α,β′-Brass in Basic NaNO3Solutions

Dissolution Kinetics of α,β′-Brass in Basic NaNO3Solutions

The Electrochemical Behavior of α,β′-Brass in Basic NaNO3Solutions

2-Amino-5-ethyl-1,3,4-thiadiazole as inhibitor of brass corrosion in 3% NaCl

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Product

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Dissolution Kinetics of α,β^′-Brass in Basic NaNO₃Solutions

Dissolution Kinetics of α,β^′-Brass in Basic NaNO₃Solutions

The Electrochemical Behavior of α,β^′-Brass in Basic NaNO₃Solutions