Application of Mössbauer spectroscopy to the study of tannins inhibition of iron and steel corrosion

Jaén, Juan A.; Obaldía, J. De; Rodríguez, M. V.

doi:10.1007/978-94-007-4301-4_5

Cited by 2 publications

(2 citation statements)

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“…The presence of aromatic rings with hydroxyl groups in ortho positions made the tannin capable to chelate iron and other metallic cations. In the case of Fe +3 , a dark blue, highly insoluble complex, called ferric "tannate" is formed [16][17][18]. As ferric "tannate" can change the active layer of oxides in a highly crosslinked protective network, tannins are considered as oxides converters [19].…”

Section: Introductionmentioning

confidence: 99%

Primers based on tara and quebracho tannins for poorly prepared steel surfaces

Byrne

D'Alessandro

Selmi

et al. 2019

Progress in Organic Coatings

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Steel panels must be protected during storage and transportation because they can corrode. This protection used to be afforded by chromate primers, but nowadays tannin-based primers are being studied. These primers are not only used as protection but also as adhesion promoter if the steel surface was not well prepared (presence of oxides or low roughness). The objective of this work was to prepare lanthanum "tannate", employing tara and quebracho tannins. The "tannates" were incorporated in primers formulation and applied on steel SAE 1010 panels (previously exposed to the humidity chamber or with 6 μm of roughness depth). These primed panels were exposed to humidity chamber where corrosion and blistering degrees were evaluated. Adhesion test were done. Electrochemical assays such as ionic resistance and corrosion potential measurements were carried out. Results showed that the adhesion and the barrier properties of the primers were good. Besides, on low roughness steel, the primers diminished the corrosion current. Results were compared with traditional zinc tetroxychromate primer.

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Section: Introductionmentioning

confidence: 99%

Primers based on tara and quebracho tannins for poorly prepared steel surfaces

Byrne

D'Alessandro

Selmi

et al. 2019

Progress in Organic Coatings

View full text Add to dashboard Cite

show abstract

“…TA has been extensively utilized in anticorrosion methods as investigated by infrared, Mössbauer, Raman spectroscopies, EIS, PD and others Nasrazadani , 1997;Jaén et al, 2003Jaén et al, , 2011Al-Mayouf, 1999;Ocampo et al, 2004;Galván Jr et al, 1992;Chen et al, 2009). TA is used as conversion coating to prevent corrosion of iron, zinc, copper and their alloys.…”

Section: Use In Corrosion Resistancementioning

confidence: 99%