The atmospheric corrosion of copper by hydrogen sulphide in underground conditions

Tran, Thanh Tuan; Fiaud, C.; Sutter, Éliane; Villanova, A

doi:10.1016/s0010-938x(03)00112-4

Cited by 55 publications

(44 citation statements)

References 24 publications

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“…These are attributed to intermediate and crystalline copper (I) oxide, respectively. 21 The intermediate copper (I) oxides is a phase formed through transformation of the amorphous oxide into the crystalline oxide. Likewise, the compound formed in 0.01 mol L -1 CH 3 CH 2 COOH solutions (pH 3.5) is close to the peak observed at 0.9 V SCE from the 680 ppbv and 90% RH coupons.…”

Section: Resultsmentioning

confidence: 99%

Study of the copper corrosion mechanism in the presence of propionic acid vapors

Echavarrı́a¹,

Echeverría²,

Arroyave³

et al. 2009

J. Braz. Chem. Soc.

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O mecanismo da interação entre o cobre e os vapores do ácido propiônico é apresentado. As exposições foram realizadas em diferentes tempos e concentração de poluentes. Varredura Catódica, XRD e SEM foram usados para quantificar o grau de deterioração. Os resultados obtidos foram explicados pelo seguinte mecanismo: Uma camada do cuprita (Cu 2 O) é formada imediatamente. Este composto, na presença da água adsorvida é oxidado a tenorita (CuO) com aumento do pH. A hidratação da camada de tenorita beneficia a formação de um hidróxido CuO•xH 2 O. Enquanto o nível do poluente é aumentado, o propionato básico insolúvel é formado (Cu(OH) x (Pro) 2-x ). Concentrações mais elevadas de ácido propiônico acidificam as mono camadas e um composto novo Cu (Pro) 2 •H 2 O começa a se precipitar em pH baixo. Este é o constituinte principal da pátina verdeoliva formada nessas condições. Este mecanismo concorda, em termos gerais, com os propostos em trabalhos precedentes visando estudar a interação entre o cobre e os ácidos acético e fórmico.The interaction mechanism between copper and propionic acid vapors is shown. Exposures were carried out to various pollutant concentrations and times. Cathodic scan, x-ray diffraction (XRD) and scanning electrode microscope (SEM) were used to quantify the degree of deterioration. The results obtained were explained by the following mechanism: A cuprite (Cu 2 O) layer covers the copper surface immediately; this compound in presence of adsorbed water is oxidized to tenorite (CuO). The hydration of the tenorite layer benefits the formation of a hydroxide compound such as CuO•xH 2 O. As the pollutant level is increased, insoluble basic propionate is formed (Cu(OH) x (CH 3 CH 2 COO) 2-x ). Higher concentrations of propionic acid acidify the monolayers and a new compound Cu(CH 3 CH 2 COO) 2 •H 2 O begins to precipitate at low pH, this is the main constituent of the green olive patina formed under these conditions. This mechanism agrees, in general terms, with those proposed in previous works to study the interaction between copper and the acetic and formic acids.

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Section: Resultsmentioning

confidence: 99%

Study of the copper corrosion mechanism in the presence of propionic acid vapors

Echavarrı́a¹,

Echeverría²,

Arroyave³

et al. 2009

J. Braz. Chem. Soc.

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“…This is consistent with previously published results for the same exposure conditions 10 . A second plateau, close to -0.75 V SCE , can be discerned associated to the intermediate cuprite reduction 23 , that has been observed in exposures of copper in a clean humidity environment. Finally, we can see a final plateau around -1.15 V SCE corresponding to the hydrogen reduction, that is the final reduction step [3][4][5][6][7][8][9][10][15][16][17][18][19][20][21][22] .…”

Section: Methodsmentioning

confidence: 66%

“…2, and it was found from all exposure times. These compound is the "bulk" cuprite that is form for longer exposure times 23 . All the coulometric reduction curves were compared with the electric charge amount, that is, the current density applied times the testing time.…”

Section: Methodsmentioning

confidence: 99%

Influence of Environmental Factors in the Atmospheric Corrosion of Copper in the Presence of Propionic Acid

Echavarrı́a¹,

Echeverría

Gil

et al. 2009

J. Chil. Chem. Soc.

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Exposure time, pollutant concentration, and relative humidity (RH) are important environmental variables for the atmospheric corrosion of copper in the presence of propionic acid vapors. This paper shows the most outstanding results into the effect of these variables. This study was carried out by mean of exposures at dynamic conditions in 260, 380, and 680 ppbv propionic acid, with relative humidities of 70% and 90%. The effect of the propionic acid was also evaluated in static conditions with 4, 40, and 120 ppmv propionic acid with relative humidities of 40%, 80%, and 100% RH. All the samples were evaluated by triplicate within 21 days of exposure. The corrosion rate was used to quantify the degradation of copper by mean of weight loss and coulometric reduction technique. Coulometric reduction indicates that the charge needed to reduce the oxides increases as exposure time, relative humidity and pollutant concentration increases. On the other hand, the corrosion rate determined gravimetrically, confirms that at a higher relative humidity and higher propionic acid concentration the copper deterioration is also higher.

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“…IEC 60296), for the dual purpose of providing electrical insulation and cooling of the copper conductors [1,2]. Sulphidemediated corrosion of copper and its alloys is a known issue in many applications of metallic materials, still subject of interest of the corrosion scientific community in both aqueous [3][4][5][6] and non aqueous environment [7][8][9][10]. In fact, previous studies have shown how certain organic compounds containing sulphur (e.g.…”

Section: Introductionmentioning

confidence: 99%

Static secondary ion mass spectrometry investigation of corrosion inhibitor Irgamet ® 39 on copper surfaces treated in power transformer insulating oil

et al. 2015

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Static secondary ion mass spectrometry was used to study the corrosion inhibitor Irgamet®39 on the surface of copper treated in insulating oils and the effect of temperature changes, by means of temperature programmed desorption experiments under vacuum, on metal coverage. Four commercial oils, both corrosive and noncorrosive, showed no significant influence on the stability of the tolyltriazole layer and the energy of its main desorption event from copper was calculated around 100 kJ mol -1 . Finally, an example of ion imaging as diagnostic tool to track the distribution of corrosion inhibitor and by-products in decommissioned or failed power transformers is described. HighlightsSSIMS was used to study corrosion inhibition of copper treated in insulating oil.Desorption experiments allowed the study of the inhibitor stability in vacuum.The energy of desorption of tolyltriazole under SSIMS conditions was calculated.SSIMS imaging was shown to be an applicable new diagnostic tool for transformers.

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The atmospheric corrosion of copper by hydrogen sulphide in underground conditions

Cited by 55 publications

References 24 publications

Study of the copper corrosion mechanism in the presence of propionic acid vapors

Study of the copper corrosion mechanism in the presence of propionic acid vapors

Influence of Environmental Factors in the Atmospheric Corrosion of Copper in the Presence of Propionic Acid

Static secondary ion mass spectrometry investigation of corrosion inhibitor Irgamet ® 39 on copper surfaces treated in power transformer insulating oil

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