Formulation and testing of a waterborne primer containing chestnut tannin

Pardini, Oscar Ricardo; Amalvy, Javier Ignacio; Sarli, Alejandro Ramón Di; Romagnoli, Roberto; Vetere, Virginia

doi:10.1007/bf02698435

Cited by 36 publications

(18 citation statements)

References 15 publications

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“…The use of different green organic compounds as corrosion inhibitors is very promising because they are renewable, accessible, inexpensive, and non‐toxic . The corrosion inhibition action of majority of plant extracts is due to the presence of alkaloids and flavonoids and/or other heterocyclic components …”

Section: Introductionmentioning

confidence: 99%

Tannin of Acacia mearnsii as green corrosion inhibitor for AA7075‐T6 alluminum alloy in acidic medium

Guedes

Bacca

Lopes

et al. 2019

Materials & Corrosion

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The inhibition performance of Acacia mearnsii bark tannin was investigated as ecofriendly green inhibitor on the corrosion of AA7075-T6 aluminum alloy in 0.1 M HCl solution by potentiodynamic polarization technique, electrochemical impedance spectroscopy (EIS) and scanning electron microcopy (SEM). Polarization curves showed that this tannin acts predominantly as a cathodic inhibitor. High corrosion inhibition performance was achieved with inhibition efficiencies of 95% and 97% at 14 g L −1 as obtained by polarization and EIS electrochemical techniques, respectively. The SEM images revealed that localized attack initiated at intermetallic particles causing local dissolution of the matrix due to potential differences between them. EIS results and SEM images confirmed the protection of AA7075-T6 aluminum alloy by A. mearnsii bark tannin, evidencing the formation of an adsorbed film on the metal surface that attenuate the aluminum dissolution reaction. K E Y W O R D SAcacia mearnsii tannin, aluminum alloy, green corrosion inhibitor

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Section: Introductionmentioning

confidence: 99%

Tannin of Acacia mearnsii as green corrosion inhibitor for AA7075‐T6 alluminum alloy in acidic medium

Guedes

Bacca

Lopes

et al. 2019

Materials & Corrosion

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“…Tannins can convert active rust into compounds that are more stable and corrosion‐resistant . Some authors have developed a tannin primer coating that exhibited excellent anticorrosive properties . On the other hand, the presence of hydrolysable tannins inhibits the formation of magnetite .…”

Section: Introductionmentioning

confidence: 99%

Black wattle tannin as a zinc phosphating coating sealer

Peres

Cassel

Ferreira

et al. 2013

Surface & Interface Analysis

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This paper reports an investigation into the use of condensed black wattle tannin as an environmental friendly sealer after zinc phosphating of carbon steel. In order to verify the sealer efficiency against corrosion, electrochemical impedance spectroscopy, potentiodynamic polarisation and salt spray tests were performed. To verify the pore modifications and phase compositions, SEM, electron dispersive spectroscopy and X‐ray diffraction analysis were carried out. The influence of the sealer on the adherence of finishing coatings was analysed. The results show that the tannin/sealer did not affect the final coating adhesion and improved the corrosion resistance of sealed samples. Copyright © 2013 John Wiley & Sons, Ltd.

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“…Also, it has been found that the efficiency of inhibition tannins decreases with increasing pH [15]. According to several authors [16,17], they are more effective when used in conjunction with phosphoric acid. Nevertheless, other authors [18][19][20] concluded that the use of tannins or their addition into formulations does not improve the anticorrosion properties.…”

Section: Introductionmentioning

confidence: 96%

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

2011

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The inhibitory effect of tannins was investigated using, among others, potentiodynamic polarizations and Mössbauer spectroscopy. These techniques confirmed that the nature, pH and concentration of tannic solution are of upmost importance in the inhibitory properties of the solutions. It is observed that at low tannin concentration or pH, both, hydrolizable and condensed tannins, effectively inhibit iron corrosion, due to the redox properties of tannins. At pH ≈ 0, Mössbauer spectra of the frozen aqueous solutions of iron(III) with the tannin solutions showed that iron is in the form of a monomeric species [Fe(H 2 O) 6 ] 3+ , without coordination with the functional hydroxyl groups of the tannins. The suspended material consisted of amorphous ferric oxide and oxyhydroxides, though with quebracho tannin partly resulted in complex formation and in an iron (II) species from a redox process. Other tannins, such as chestnut hydrolysable tannins, do not complex iron at this low pH. Tannins react at high concentrations or pH (3 and 5) to form insoluble blue-black amorphous complexes of mono-and bis-type tannate complexes, with a relative amount of the bis-ferric tannate generally increasing with pH. Some Fe 2+ in the form of hydrated polymeric ferrous tannate could be obtained. At pH 7, a partially hydrolyzed ferric tannate complex was also formed. The latter two phases do not provide corrosion protection. Tannin solutions at natural pH react with electrodeposited iron films (approx. 6 μm) to obtain products consisting only on the catecholate mono-complex of ferric tannate. Some aspects of the mechanism of tannins protection against corrosion are discussed.

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Formulation and testing of a waterborne primer containing chestnut tannin

Cited by 36 publications

References 15 publications

Tannin of Acacia mearnsii as green corrosion inhibitor for AA7075‐T6 alluminum alloy in acidic medium

Tannin of Acacia mearnsii as green corrosion inhibitor for AA7075‐T6 alluminum alloy in acidic medium

Black wattle tannin as a zinc phosphating coating sealer

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

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