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Corrosion Evaluation of Rust Converter and Microcrystalline Wax on Cannon Balls from San Juan de Ulua Fortress

Published online by Cambridge University Press:  20 May 2014

R. Orozco-Cruz ,
M. Ambros-Peralta ,
R. Galvan-Martinez  and
J. Reyes-Trujeque
R. Orozco-Cruz
Affiliation:
Cuerpo Académico de Ingeniería de Corrosión y Protección. Instituto de Ingeniería. Universidad Veracruzana. Av. S.S. Juan Pablo II s/n, Z. Universitaria, Boca del Río, Veracruz 94294, Mexico. e-mail: [email protected]
M. Ambros-Peralta
Affiliation:
Cuerpo Académico de Ingeniería de Corrosión y Protección. Instituto de Ingeniería. Universidad Veracruzana. Av. S.S. Juan Pablo II s/n, Z. Universitaria, Boca del Río, Veracruz 94294, Mexico. e-mail: [email protected]
R. Galvan-Martinez
Affiliation:
Cuerpo Académico de Ingeniería de Corrosión y Protección. Instituto de Ingeniería. Universidad Veracruzana. Av. S.S. Juan Pablo II s/n, Z. Universitaria, Boca del Río, Veracruz 94294, Mexico. e-mail: [email protected]
J. Reyes-Trujeque
Affiliation:
Cuerpo Académico de Ciencia e Ingeniería Ambiental Aplicada al Estudio de Materiales de Interés Histórico y Artístico: Degradación y Conservación. CICORR. Universidad Autónoma de Campeche. Agustín Melgar S/N, San Francisco de Campeche, Campeche 24039, Mexico.
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Abstract

One of the main problems encountered by curators and conservators in charge of metallic collections from Historical Heritage is related to their long-term conservation, since metallic artifacts undergo corrosion phenomena, which are the result of the interaction between the metal and its environment. The use of rust converters and microcrystalline waxes can be an ecological alternative to the traditional and more aggressive conservation techniques. Although the mechanism of action of these compounds is not clear, it is assumed that they react with iron oxides and generate new compounds that may have a passivation effect on the metallic surface. This paper proposes to show how simple electrochemical techniques can be used as an efficient tool to contribute to the diagnosis of the conservation state of cannon balls and to monitor the restoration treatment. The objective of the present work is to evaluate the effectiveness of a rust converter based on tannins and phosphoric acid, and one microcrystalline wax applied on cannon balls samples exposed to a marine atmosphere. The protection properties of the oxide or conversion layer are evaluated by electrochemical impedance spectroscopy (EIS) technique. The results obtained suggest that the use of the rust converter and microcrystalline wax protects the cannon balls, even though its effect is less evident when the deterioration degree is larger.

Keywords

corrosionsurface reactionenvironmentally benign
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1618: Symposium 8A – Cultural Heritage and Archaeological Issues in Materials Science , 2014 , pp. 227 - 232
Copyright
Copyright © Materials Research Society 2014 

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