Artículo . Anales CIDEPINT ; 1996

Chemical and electrochemical assessment of tannins and aqueous primers containing tannins

Vetere, Vicente | Romagnoli, Roberto
Abstract: When the mechanical cleaning of metallic surfaces is not possible, some chemical treatments are an important possibility. The benefit of using acidified aqueous suspensions of tannins in this field has been recognized for more than thirty years.
Abstract: When the mechanical cleaning of metallic surfaces is not possible, some chemical treatments are an important possibility. The benefit of using acidified aqueous suspensions of tannins in this field has been recognized for more than thirty years. However, little is known about the action of these substances on rusted surfaces. Thus, the chemical reaction of tannins with soluble and precipitated ferric species was studied. The influence of the phosphate anion was also considered. At the same time, cleaned and oxidized steel surfaces, treated with tannin suspensions were analyzed by microscopy and scanning electrón microscopy (SEM) to observe the surface film morphology. Four tannins were selected to carry out this investigation: quebracho, sulphitated quebracho, mimosa and chestnut. The experimental results show that each tannin reacts with soluble and precipitated ferric species in a different way. This reaction depends on the pH of the solution. The tannate film formed on the steel surfaces had a píate morphology which also depended on the tannin. The presence of phosphoric acid contributed to the tannate film building.
  • Alternative title: Evaluación química y electroquímica de taninos y de imprimaciones acuosas a base de taninos
  • Origin info: Centro de Investigación y Desarrollo en Tecnología de Pinturas
  • CIC Center: Centro de Investigación y Desarrollo en Tecnología de Pinturas
  • Subject: Ciencias Químicas
  • Lenguage: Inglés
  • Extension: p. 27-40

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  • Date of availability: 22 de octubre de 2019
  • Date of accession: 22 de octubre de 2019
  • Date issued: 1996
  • Others identifiers: ISSN 0325-4186
  • URL to resource: https://digital.cic.gba.gob.ar/handle/11746/10370
  • Licence: Attribution 4.0 International (BY 4.0)

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This work is published under license Creative Commons Attribution 4.0 International (BY 4.0)
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