Black wattle tannin as a zinc phosphating coating sealer

Peres, Rafael; Cassel, Eduardo; Ferreira, Carlos Arthur; Azambuja, Denise Schermann

doi:10.1002/sia.5345

Cited by 13 publications

(16 citation statements)

References 29 publications

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“…Moreover, the Fe content decreased with the increase in C contents at the pore is observed when Zn-P coated mild steel undergo treatment with TAE and TME. This indicated the present of carbon correspond to the tannin sealant [7]. This prove that the tannin successfully sealed at the pore of Zn-P coated mild steel and the proposed mechanism showed in figure 10.…”

Section: Potentiodynamic Polarizationsupporting

confidence: 64%

“…The prepared mild steel immersed in zinc phosphating bath at 80°C for 10 min and then rinsed with deionized water and dried [7]. The zinc phosphating bath was prepared based on a composition of 17.5 g l −1 , 20.0 g l −1 , 11.5 g l −1 , and 0.25 g l −1 of phosphoric acid, nitric acid, zinc oxide, and nickel sulphate, respectively.…”

Section: Zn-p Coatingmentioning

confidence: 99%

“…The Zn-P mild steel then immersed in different concentration of TAE (2, 4, 6, 8, 10 g l −1 ) dissolved in distilled water for 40 min. The pH value of all the concentration was controlled close to pH 6.0 (optimal for formation of ferric-tannate) [7]. The method then repeated using TME as a sealant.…”

Section: Sealing Processmentioning

confidence: 99%

“…Phosphate coating form a layer of insoluble crystalline phosphate on the metal surface to be protected [6]. The layer formed increases the corrosion resistance [7]. However, adhesion of zinc phosphate coating on the surface of metal leads to formation of pore and microcracks [8] that decrease the corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…However, adhesion of zinc phosphate coating on the surface of metal leads to formation of pore and microcracks [8] that decrease the corrosion resistance. Therefore, sealing the pores is an alternative to increase corrosion resistance [7].…”

Section: Introductionmentioning

confidence: 99%

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Mangrove bark tannins as a Zn–P coating sealant for mild steel corrosion protection in 3.5% NaCl solution

Abidin

Hussin

2020

Mater. Res. Express

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In this work, mangrove bark tannins have been studied as a sealant after Zn-P of mild steel. The efficiency of the sealant against the corrosion was tested by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation (PD) in 3.5% NaCl solution. The increased in the concentration of the tannin as a sealant increases the inhibition efficiency up to optimum concentration of 4 g l −1 . The inhibition efficiencies of tannin methanol extract (TME) and 70% tannin acetone extract (TAE) were 83.52% and 71.12% respectively. The results obtained from EIS and PD were in a good agreement and complementary to each other. The double layer constant phase element capacitance (CPE dl ) decrease indicated that a film form on the surface of the mild steel that retard the corrosion activities. Further, the pore modifications and elemental compositions were analyzed by scanning electron microscope (SEM) and energy dispersive x-ray (EDX).

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Section: Potentiodynamic Polarizationsupporting

confidence: 64%

Section: Zn-p Coatingmentioning

confidence: 99%

Section: Sealing Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mangrove bark tannins as a Zn–P coating sealant for mild steel corrosion protection in 3.5% NaCl solution

Abidin

Hussin

2020

Mater. Res. Express

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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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