Smart-release inhibition of corrosion driven organic coating failure on zinc by cationic benzotriazole based pigments

Richards, C.A.J.; McMurray, H. N.; Williams, Geraint

doi:10.1016/j.corsci.2019.04.005

Cited by 33 publications

(20 citation statements)

References 41 publications

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“…Furthermore, according to the p K a values of neutral BTAH (p K a = 8.2), it is more likely to be protonated and act as a base. In this case, the BTAH 2 + cation is predicted to be stable in the presence of strongly acidic species . Therefore, any interaction between MOF and BTA severely declines in acidic solutions.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of a pH-Sensitive Epoxy Nanocomposite Coating Based on a Zn-BTC Metal–Organic Framework Containing Benzotriazole as a Smart Corrosion Inhibitor

Mohammadpour

Zare

2021

Crystal Growth & Design

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In this study, a pH-sensitive Epoxy/BTA@Zn-BTC smart anticorrosion nanocomposite coating was fabricated by the encapsulation of a benzotriazole (BTA) corrosion inhibitor in a Zn-BTC metal−organic framework (MOF). The corrosion process of the coating was investigated for different durations of storing the coating in a corrosive solution of 3.5 wt % NaCl using potentiodynamic polarization (Tafel) plots and electrochemical impedance spectroscopy. The synthesized BTA@Zn-BTC nanocapsules have a loading capacity of 16.5% for BTA. The BTA encapsulated in Zn-BTC MOF is released as the corrosion zone becomes acidic, and it serves as a corrosion inhibitor. The released BTA inhibitor proved to have an inhibition efficiency of 98.8% to protect aluminum against corrosion in the corrosive solution after 3 days. A possible mechanism has been presented for the formation of a protective film in this process. It is argued that in the active areas of corrosion on the metal surface the local pH decreases and the H + ions produced in the corrosion reaction rapidly penetrate into the BTA@Zn-BTC nanocapsules, releasing the BTA inhibitor. Then, the released inhibitor forms a dense barrier in the corrosion area to decrease the corrosion rate. As found in this study, the durability of this smart coating is significantly prolonged in a 3.5 wt % NaCl solution.

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Section: Resultsmentioning

confidence: 99%

Fabrication of a pH-Sensitive Epoxy Nanocomposite Coating Based on a Zn-BTC Metal–Organic Framework Containing Benzotriazole as a Smart Corrosion Inhibitor

Mohammadpour

Zare

2021

Crystal Growth & Design

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“…The fact that fluorescence was detected only at scratched areas without visible appearance of the corrosion product was attributed to the release of BTA. BTA is known as one of the best corrosion inhibitors for copper and its alloys in a wide range of environments. , BTA can form intermolecular structures on the copper surface via hydrogen bonding and complex compounds with metal ions. , BTA can be either chemisorbed in a vertical geometry or physically adsorbed with a molecule almost parallel to the surface . Moreover, BTA has the ability to form poorly water-soluble complexes with cations of many metals (Ag, Cu, Zn, Ni, and Fe).…”

Section: Resultsmentioning

confidence: 99%

“…BTA is known as one of the best corrosion inhibitors for copper and its alloys in a wide range of environments. 62,63 BTA can form intermolecular structures on the copper surface via hydrogen bonding and complex compounds with metal ions. 64,65 BTA can be either chemisorbed in a vertical geometry or physically adsorbed with a molecule almost parallel to the surface.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Design of Nanostructured Protective Coatings with a Sensing Function

Salaluk

Jiang

Viyanit

et al. 2021

ACS Appl. Mater. Interfaces

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Nanostructured multilayered coatings for metals are prepared to simultaneously provide a function of corrosion mitigation and of corrosion sensing for copper substrates. Silica nanocapsules, embedded in one layer of the coating, are used as a host for a corrosion inhibitor and as a sensor, which detect changes of pH value and release inhibitors via an optical signal. Furthermore, another layer in the coating exists in a nanonetwork loaded with another corrosion inhibitor, which is impregnated with a hydrophobic polymer. We demonstrate that a specific arrangement of layers leads to an optimum anticorrosion and sensing performance while the sensing signal can be prolonged for a long time. It is the first time that the fluorophore detecting corrosion is conjugated to the nanosensor and that nanofibers and nanocapsules are used simultaneously to load and release corrosion inhibitors for anticorrosion applications.

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“…Detailed accounts of the cathodic delamination of an unpigmented PVB coating from HDG have been published elsewhere. 10,24,25 Initially both Na + and Cl − (from the experimental electrolyte) can diffuse into the interface and a galvanic cell element does not exist. 35 Time dependent E corr (x) profiles became established approximately 120 minutes (t i ) after initiation and are shown in Figure 4a.…”

Section: Skp Results-delamination Of Unpigmented Pvb Coatings-mentioning

confidence: 99%

A Method for Quantifying the Synergistic Inhibitory Effect of Corrosion Inhibitors When Used in Combination: A ‘Chromate Generating Coating’

Wint

Ansell

Edy

et al. 2019

J. Electrochem. Soc.

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Corrosion inhibitive pigments, based on the cations Ce 4+ and Cr 3+ exchanged into smart release resins, are dispersed in a polyvinyl butyral (PVB) model coating and applied to a hot dip galvanised steel (HDG) substrate. An investigation is made into the influence of different pigment volume fractions (ø pig) of Ce(IV) and Cr(III) based inhibitors, used both in isolation and combination, on the kinetics and mechanism of corrosion driven cathodic coating delamination. The rate of coating delamination is obtained using scanning Kelvin probe (SKP) potentiometry and time lapse photography, and the efficiency with which each inhibitor combination is able to resist cathodic coating delamination is calculated. Isobolograms, commonly utilized within the field of drug interaction, are presented as an effective method for characterising corrosion inhibitor interactions. In some cases, the sum of the efficiencies calculated for Ce(IV) and Cr(III) based pigments is shown to be greater than the sum of their individual efficiencies. It is proposed that Ce 4+ , released upon electrolyte exposure, is able to oxidize the Cr 3+ species resulting in the formation of transient CrO 4 −2 .

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Smart-release inhibition of corrosion driven organic coating failure on zinc by cationic benzotriazole based pigments

Abstract: Smart-release inhibition of corrosion driven organic coating failure on zinc by cationic benzotriazole based pigments. Corrosion Science

Cited by 33 publications

References 41 publications

Fabrication of a pH-Sensitive Epoxy Nanocomposite Coating Based on a Zn-BTC Metal–Organic Framework Containing Benzotriazole as a Smart Corrosion Inhibitor

Fabrication of a pH-Sensitive Epoxy Nanocomposite Coating Based on a Zn-BTC Metal–Organic Framework Containing Benzotriazole as a Smart Corrosion Inhibitor

Design of Nanostructured Protective Coatings with a Sensing Function

A Method for Quantifying the Synergistic Inhibitory Effect of Corrosion Inhibitors When Used in Combination: A ‘Chromate Generating Coating’

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