info:eu-repo/semantics/article
Primers based on tara and quebracho tannins for poorly prepared steel surfaces
Fecha
2019-05Registro en:
Byrne, Christian Eduardo; D'alessandro, Oriana; Selmi, Gonzalo Julian; Romagnoli, Roberto; Deya, Marta Cecilia; Primers based on tara and quebracho tannins for poorly prepared steel surfaces; Elsevier; Progress in Organic Coatings; 130; 5-2019; 244-250
0300-9440
CONICET Digital
CONICET
Autor
Byrne, Christian Eduardo
D'alessandro, Oriana
Selmi, Gonzalo Julian
Romagnoli, Roberto
Deya, Marta Cecilia
Resumen
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 humiditychamber 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.