Deterioro de aleaciones de cobre por acción humana

Durán, A.; Pérez-Rodríguez, J. L.; Herrera, Liz Karen; Jiménez-de-Haro, M. C.; Robador, M.D.; Justo, A.; Blanes, J. M.; Pérez-Ferrer, J. C.

doi:10.3989/revmetalm.2008.v44.i1.98

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…A relationship between potential and current density cathodic peaks was obtained, according to Mu ¨ller's model, showing a proportionality factor with the dimensions of a resistance. 2,26,28,29,149,150,[153][154][155] Figure 9 shows the dependence of the current density peak i m and the potential peak E m on n for copper specimens under the six treatments. The n 1/2 dependence found can be explained on the basis of Mu ¨ller's model.…”

Section: Rate Control For Copper Tarnishingmentioning

confidence: 99%

Copper deterioration: causes, diagnosis and risk minimisation

Bastidas¹,

Criado²,

Fajardo³

et al. 2010

International Materials Reviews

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Copper is widely used in many applications such as heat exchangers, condensers, heating and air conditioning systems, electricity, electronic circuitry and ornamental parts. This paper reviews the issue of copper corrosion in different environments and applications. Special attention is paid to the influence of relative humidity and low molecular weight carboxylic acids. These acids are present in rain, snow, clouds and particulate matter and contribute about 15-35% of rain acidity. Attention is also paid to copper corrosion originated by formic, acetic, propionic and butyric acid vapours. Corrosion product layers (patina) are analysed, showing the relationship between potential and current density cathodic peaks, and models are proposed that show a proportionality factor of the dimensions of a resistor. These results are of practical importance in copper roofing applications. Before 1985, copper was almost universally considered to be a corrosion resistant conduit of potable water, and few instances of copper tube failure were reported. Where unacceptable performance was identified, the problem was usually attributed to reticulation and plumbing systems. In air conditioning applications, premature failure of copper tubing frequently occurs due to pitting corrosion after a short time in service or even during postinstallation leakage tests. This type of corrosion is described in the literature as formicary corrosion, and its morphology is characterised by microscopic caverns connected by tunnels. Specimens are analysed to assess the reasons for such premature corrosion failure. Finally, procedures to mitigate copper corrosion are addressed. Pickling in dilute mineral acids (H 2 SO 4 and HCl) is discussed as the most common method for removing oxides formed on the surface of copper based materials during mill processing and manufacturing operations. The use of corrosion inhibitors, such as immersion corrosion inhibitors and volatile corrosion inhibitors (VCI), is a widespread practice to reduce copper corrosion, achieving significant delays in the corrosion process. Reference is made to the search for new environmentally friendly inhibitors for copper and bronze using organic compounds in acid, neutral and alkaline media, and a number of ecological alternatives are reviewed.

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Section: Rate Control For Copper Tarnishingmentioning

confidence: 99%

Copper deterioration: causes, diagnosis and risk minimisation

Bastidas¹,

Criado²,

Fajardo³

et al. 2010

International Materials Reviews

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“…The presence of akaganeite has been attributed to an incorrect cleaning procedure with an inappropriate product containing chlorine (Fig. 4 b)) [29] . Although there is a large distance between Cordoba and the coast, the presence of chloride ions from the sea could not be discounted, but in this case, the presence of akaganeite is attributed to a cleaning product, based on the testimonies and studies of different restorers, who performed a partial restoration in this Portico.…”

Section: 2 2 I Ir Ro On Nmentioning

confidence: 99%

Study of degradation processes of metals used in some artworks from the cultural heritage of Andalusia, Spain

Durán¹,

Herrera²,

Haro³

et al. 2009

Rev. metal.

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S St tu ud dy y o of f d de eg gr ra ad da at ti io on n p pr ro oc ce es ss se es s o of f m me et ta al ls s u us se ed d i in n s so om me e a ar rt tw wo or rk ks s f fr ro om m t th he e c cu ul lt tu ur ra al l h he er ri it ta ag ge e o of f A An nd da al lu us si ia a, , S Sp pa ai in n ( (• •) )A. Duran*, **, L.K. Herrera*, M.C. Jiménez de Haro*, J.L. Pérez-Rodríguez* and A. Justo* A Ab bs st tr ra ac ct tThe study of the alteration processes of metals, such as lead, bronze, iron and tin-mercury alloys, used in some of the most important chosen artefacts of Andalusian Cultural Heritage is the main objective of this paper. Hydrocerussite and cerussite were detected in lead seals stored in a hole of cardboard. Bronze is altered to atacamite by environmental contamination, which is also responsible for the formation of rust from iron. Corrosion of the tin-mercury surface of amalgam mirrors produces tin monoxide and tin dioxide and releases liquid mercury from the solid phase. K Ke ey yw wo or rd ds sDegradation processes; Lead; Bronze; Iron; Tin-mercury amalgam.E Es st tu ud di io o d de e l lo os s p pr ro oc ce es so os s d de e d de eg gr ra ad da ac ci ió ón n d de e m me et ta al le es s e em mp pl le ea ad do os s e en n o ob br ra as s d de el l p pa at tr ri im mo on ni io o c cu ul lt tu ur ra al l d de e A An nd da al lu uc cí ía a, , E Es sp pa añ ña a R Re es su um me en n El estudio de los procesos de alteración de metales como plomo, bronce, hierro y aleaciones de estaño-mercurio empleados en algunas de las más importantes ornamentaciones elegidas del patrimonio cultural de Andalucía es el principal objetivo de este trabajo. Hidrocerusita y cerusita se detectaron en sellos de plomo almacenados en compartimentos de cartón. El bronce se altera a atacamita debido a la contaminación ambiental, factor que es también responsable de la formación de compuestos polvorientos a partir del hierro. La corrosión de la amalgama de estaño-mercurio de espejos antiguos produce óxidos de estaño y restos de mercurio líquido procedentes de la fase sólida. P Pa al la ab br ra as s c cl la av ve e Procesos de degradación; Plomo; Bronce; Hierro; Amalgama de estaño y mercurio. 1. . I IN NT TR RO OD DU UC CT TI IO ON NFor millennia, humans have used metals to create both utilitarian and ornamental items. Most metallic items suffer some corrosion process over time, mainly because of oxidation by air. The corrosion products are oxides, hydroxides, sulphides, sulphates and carbonates depending upon the metals present and the environmental condition of the metals.The use of metals for artefact construction has been known since antiquity [1 and 2] . Metals were used less extensively as support for paintings in ancient times, probably because they were highly valued for other purposes and were not available in large sheets or panels. Sheets were beaten out laboriously by hand. Methods for rolling metals were developed in the middle of the 16 th century.Lead alloys were widely used in antiquity, especially in organ pipes, c...

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Study of the gilding technique used in polychromed stones and ceramics by dedicated laboratory-made micro X-ray diffraction and complementary techniques

Durán

Pérez-Rodríguez²,

Haro³

2009

Anal Bioanal Chem

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This work describes the use of a new dedicated laboratory-made micro X-ray diffraction system for detecting the phases present in cross-sections of artworks. As an example, the phases present in samples from gilding ceramics and stone sculptures from the heritage of Seville (Spain) were successfully detected using this new system, which takes advantage of various devices developed for synchrotron radiation, and is complemented by the information provided by other techniques.

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Deterioro de aleaciones de cobre por acción humana

Cited by 4 publications

References 10 publications

Copper deterioration: causes, diagnosis and risk minimisation

Copper deterioration: causes, diagnosis and risk minimisation

Study of degradation processes of metals used in some artworks from the cultural heritage of Andalusia, Spain

Study of the gilding technique used in polychromed stones and ceramics by dedicated laboratory-made micro X-ray diffraction and complementary techniques

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