Water-based &amp; eco-friendly &amp; high-efficiency 3,4,5-Trihydroxybenzoic acid ester as a novel rust conversion agent and its polymer composites for enhanced surface anticorrosion

Lei, Yun; Yu, Ping; Peng, Haoping; Luan, Zhaolin; Deng, Song; Wang, Shuhao; Zhou, Nianyong

doi:10.1016/j.colsurfa.2021.127065

Cited by 10 publications

(5 citation statements)

References 34 publications

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“…In addition, DMAP is used as the catalyst. Taking the mass ratio of TE to GA 2:1 as an example, please refer to our previous article for the detailed preparation process …”

Section: Methodsmentioning

confidence: 99%

“…After this, the rust conversion coating was directly and uniformly coated on the pretreated rust plate at one time. For the specific coating method and process, please refer to our previous published article . The well-coated samples were dried in a drying oven at room temperature for 72 h, and then, the properties of the well-coated samples were analyzed by FTIR, SEM, potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS).…”

Section: Methodsmentioning

confidence: 99%

“…In addition, the fracture surface morphology and microstructure of the prepared samples were obtained by SEM (HITACHI S4800). The electrochemical properties of the prepared samples were analyzed using the PDP test and EIS in 3.5 wt% NaCl solution on a CHI-660E electrochemical workstation (Chenhua, China) during many days of immersion, and for specific test methods, please refer to ref .…”

Section: Methodsmentioning

confidence: 99%

“…Taking the mass ratio of TE to GA 2:1 as an example, please refer to our previous article for the detailed preparation process. 40 2.3. Preparation of Rust Samples Coated with Rust Conversion Coating.…”

Section: Synthesis Of Rust Conversionmentioning

confidence: 99%

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Effect on the Surface Anticorrosion and Corrosion Protection Mechanism of Integrated Rust Conversion Coating for Enhanced Corrosion Protection

Lei

Luan

et al. 2022

ACS Omega

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Here, a series of integrated rust conversion agents/ coatings were synthesized by esterification reaction of 3,4,5trihydroxybenzoic acid (GA) and triethanolamine (TE). The structural features, rust conversion ability, and corrosion resistance of the synthesized rust conversion agents/coatings were analyzed using the Fourier transform infrared tests, scanning electron microscopy tests, X-ray diffraction tests, and electrochemical measurements. It was found that when the mass ratio of TE and GA was 2:1, the synthesized rust conversion agent/coating has best rust conversion ability and anti-corrosion performance (i.e., corrosion current density 7.480 × 10 −7 A/cm 2 ). In addition, different from the traditional coatings, the integrated rust conversion coating developed in this study combines the primer and topcoat of traditional coatings into one, which can significantly increase the on-site construction efficiency. Furthermore, a new rust conversion mechanism for the optimized rust conversion agent/coating was proposed. The phenolic hydroxyl functional groups in the rust conversion agent can well chelate with Fe 2+ /Fe 3+ in the original rust layer and then form macromolecular compounds and dense chelating films inside the coating, which tightly wraps rust and also prevents the penetration and diffusion of corrosive medium, making them lose the opportunity to interact with each other.

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“…In addition, DMAP is used as the catalyst. Taking the mass ratio of TE to GA 2:1 as an example, please refer to our previous article for the detailed preparation process …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Synthesis Of Rust Conversionmentioning

confidence: 99%

See 2 more Smart Citations

Effect on the Surface Anticorrosion and Corrosion Protection Mechanism of Integrated Rust Conversion Coating for Enhanced Corrosion Protection

Lei

Luan

et al. 2022

ACS Omega

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“…Gallic acid (GA), a green corrosion inhibitor, is inexpensive, renewable, and widely found in various plants [20][21][22]. Previous studies have shown that GA is often used as an essential component of rust converters [23,24]. In the structure of GA, the two neighboring phenolic hydroxyl groups on the benzene ring have a strong chelating ability that can form stable bidentate chelates with Fe 2+ and Fe 3+ , which will retard the corrosion reaction of the cathode [25].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Gallic Acid Intercalated Layered Double Hydroxide for Enhanced Corrosion Protection of Epoxy Coatings

et al. 2023

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In the field of corrosion protection coatings, layered double hydroxide (LDH) has gained wide attention as a novel controlled-release nanocontainer. In this paper, by using a co-precipitation to store corrosion inhibitors in layered double hydroxide with barrier properties, an environmentally friendly gallic acid (GA) intercalated layered double hydroxide corrosion protection filler (GA-LDH) was prepared. The epoxy coating was then modified with GA-LDH to improve its corrosion protection performance. The structure, composition, and release behavior of GA-LDH were investigated by a series of characterizations, such as field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and ultraviolet-visible spectrophotometry (UV-vis). Electrochemical impedance spectroscopy (EIS) and a neutral salt spray test (NSS) were performed to evaluate the effect of EP coating containing GA-LDH on corrosion protection for Q235 steel. The results show that GA-LDH added to an epoxy coating can achieve excellent corrosion protection performance and is expected to be widely used in marine corrosion protection contexts.

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Improvement Mechanism of Corrosion Resistance in a High‐Efficiency Binary Composite Rust Conversion Agent with Chelate Properties

et al. 2023

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In this study, the rust conversion coating that acts directly on the surface of rust layer, was studied from the preparation of rust conversion agents gallic acid (GA), 2‐hydroxyphosphonyl acetic acid (HPAA), and their compound (GA/HPAA), rust conversion effect and anticorrosive mechanism. Results show that 1) when GA and HPAA were combined to form GA/HPAA with a mass ratio of 2:1, the strengthening effect of rust conversion was observed, and a more complete, dense, and smooth covering film was generated on the rust surface. In this case, the corrosion current of GA/HPAA was reduced to 4.10 × 10−7 A cm−2, while the GA was 2.35 × 10−6 A cm−2 and HPAA was 2.16 × 10−6 A cm−2. 2) The mechanism of rust conversion and corrosion resistance can be expressed as that the chelation reaction can occur between the rust and rust conversion agent, which can generate new coordination covalent bonds O–Fe–O, P–O–Fe, and C–Fe–O. In this case, they can firmly lock the rust and prevent it from spreading further. Meanwhile, a highly cross‐linked dense anticorrosion protective film can be formed. Due to the presence of these chelating products, they can act as obstacles, prolonging the diffusion path of corrosive medium and slowing down the interaction with the metal matrix.

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Water-based & eco-friendly & high-efficiency 3,4,5-Trihydroxybenzoic acid ester as a novel rust conversion agent and its polymer composites for enhanced surface anticorrosion

Cited by 10 publications

References 34 publications

Effect on the Surface Anticorrosion and Corrosion Protection Mechanism of Integrated Rust Conversion Coating for Enhanced Corrosion Protection

Effect on the Surface Anticorrosion and Corrosion Protection Mechanism of Integrated Rust Conversion Coating for Enhanced Corrosion Protection

Preparation of Gallic Acid Intercalated Layered Double Hydroxide for Enhanced Corrosion Protection of Epoxy Coatings

Improvement Mechanism of Corrosion Resistance in a High‐Efficiency Binary Composite Rust Conversion Agent with Chelate Properties

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