Copper Corrosion Mechanism in the Presence of Formic Acid Vapor for Short Exposure Times

Bastidas, J. M.; López‐Delgado, Aurora; Cano, E.; Polo, J. L.; López, Félix A.

doi:10.1149/1.1393303

Cited by 64 publications

(74 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For low relative humidity conditions, it was employed in the desiccator a saturated solution of K 2 CO 3 • 2H 2 O and NH 4 Cl to obtain 40% RH and 80% RH according to the ASTM E104-85 standard. 7 The relative humidity condition near 100% was obtained placing a recipient with 500 mL of propionic acid solution at the bottom of the desiccator.…”

Section: Exposures In Closed Chambermentioning

confidence: 99%

“…7 The relative humidity condition near 100% was obtained placing a recipient with 500 mL of propionic acid solution at the bottom of the desiccator. In these experiments the propionic acid vapor was produced, following the procedure described in previous works [2][3][4][5][6][7][8][9] and in any case, solutions were renewed weekly to prevent degradation of the organic compound.…”

Section: Exposures In Closed Chambermentioning

confidence: 99%

“…[2][3][4][5][6][7][8][9] (2) Where: the term is the vapor partial pressure of pure propionic acid (mm Hg), pH (Pro) is the partial pressure of the propionic acid in the desiccator atmosphere, T is the temperature in K, G is the mass of the propionic acid in grams in a 1000 mL solution, M H 2 O and M H (Pro) are the molecular weights of water and propionic acid and P T is the total pressure under the laboratory conditions (640 mm Hg).…”

Section: Exposures In Closed Chambermentioning

confidence: 99%

“…1 Copper is corroded in presence of these compounds such as formic, acetic and butyric. [2][3][4][5][6][7][8][9] Several studies has been performed to follow copper corrosion in presence of organic acids, and it has been found that the corrosivity of the organic acids vapors in ppmv (parts per million in volume) on copper is given by the following order (from the highest to the lowest level of aggressiveness) acetic > formic > butyric. 6,8,9 At the same time, the mechanism of degradation of copper in these acids includes the formation of a basic copper acetate and an hydrate copper acetate, copper formate and copper butyrate.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Echavarrı́a¹,

Echeverría²,

Arroyave³

et al. 2009

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

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.

show abstract

Section: Exposures In Closed Chambermentioning

confidence: 99%

Section: Exposures In Closed Chambermentioning

confidence: 99%

Section: Exposures In Closed Chambermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Echavarrı́a¹,

Echeverría²,

Arroyave³

et al. 2009

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…Graedel 2 finds that the anions of organic acids (acetates and in smaller amount, formates) constitute between 0.1 and 1% of the total ion concentration in the copper patina exposed in outdoor atmospheres by long periods of time. Copper is corroded in presence of organic acids such as formic, acetic and butyric [3][4][5][6][7][8][9][10] . It has been found that the corrossivity of the organic acids vapors in ppmv (parts per million in volume) level on copper is given in the following order (from the highest to the lowest aggressiveness level) acetic > formic > butyric 7,[9][10] .…”

Section: Introductionmentioning

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.

View full text Add to dashboard Cite

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.

show abstract

An XPS study of copper corrosion originated by formic acid vapour at 40% and 80% relative humidity

Cano¹,

Torres²,

Bastidas³

2001

Materials and Corrosion

Self Cite

130

View full text Add to dashboard Cite

Copper corrosion products originated by the action of formic acid vapours at 40% and 80% relative humidity for a period of 21 days were analysed. Three formic vapour concentration levels (10, 100 and 300 ppm) were generated in laboratory tests at 30°C. The corrosion product layers were characterised using X‐ray photoelectron spectroscopy (XPS) in conjunction with Ar+‐ion sputtering. The components identified in the patina layers were cuprite (Cu2O), copper hydroxide (Cu(OH)2) and copper formate (Cu(HCOO)2). Copper formate was formed by a complex mechanism including copper hydroxide and formic acid.

show abstract

Copper Corrosion Mechanism in the Presence of Formic Acid Vapor for Short Exposure Times

Abstract: El artículo seleccionado no se encuentra disponible por ahora a texto completo por no haber sido facilitado todavía por el investigador a cargo del archivo del mismo.

Cited by 64 publications

References 19 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

An XPS study of copper corrosion originated by formic acid vapour at 40% and 80% relative humidity

Contact Info

Product

Resources

About