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Chemical and electrochemical assessment of tannins and aqueous primers containing tannins

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Surface Coatings International

Conclusions

1. The analytical procedure outlined previously is recommended for the evaluation of the interaction of tannins with iron species. Prior to formulation, each tannin must be evaluated to assess its usefulness in formulating anticorrosive primers.

2. The determination of pH and corrosivity of tannin suspensions may help in understanding its interaction with steel. The more acidic and the more corrosive the suspension, the greater the interaction with steel.

3. The optimum pH for the tannate film lies in the range 3.0–5.0. The values are close to the natural pH of the tannins suspensions.

4. The presence of phosphoric acid in the formulations passivates the steel surfaces and favours the formation of a tannate film on clean steel surfaces. Also it assists dissolution of the oxides and further reaction with tannins.

5. Tannins react with clean and rusted steel surfaces creating a layer with a plate-like structure replacing the globular one of iron oxides.

6. Aqueous primers containing tannins inhibit steel corrosion as was revealed by potential corrosion measurements.

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Authors and Affiliations

  1. CIDEPINT — Research and Development Center for Paint Technology, Calle 52 e/ 121 y 122. (1900), La Plata, Argentina

    V F Vetere & R Romagnoli

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  1. V F Vetere
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  2. R Romagnoli
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Vetere, V.F., Romagnoli, R. Chemical and electrochemical assessment of tannins and aqueous primers containing tannins. Surface Coatings International 81, 385–391 (1998). https://doi.org/10.1007/BF02693869

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