Smart protective coatings with self‐sensing and active corrosion protection dual functionality from pH-sensitive calcium carbonate microcontainers

Liu, Tong; Zhang, Dawei; Ma, Li; Huang, Yao; Hao, Xiangping; Terryn, Herman; Mol, J.M.C.; Li, Yong

doi:10.1016/j.corsci.2022.110254

Cited by 37 publications

(13 citation statements)

References 65 publications

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“…Coatings 2022, 12, x FOR PEER REVIEW 2 of 13 performance of epoxy-resin coatings still needs to be improved [8]. Adding some nanofillers with special structures and corrosion inhibitors to epoxy coating areas has been proven to effectively enhance the corrosion resistance of coatings and increase their service life under harsh conditions [9][10][11][12][13][14][15]. How to modify nanofillers into special storage structures is a significant research topic.…”

Section: Synthesis Of Smart Anticorrosive Epoxy Coating Based On Grap...mentioning

confidence: 99%

A Smart Anticorrosive Epoxy Coating Based on Graphene Oxide/Functional Mesoporous Silica Nanoparticles for Controlled Release of Corrosion Inhibitors

Liu

Zhang

et al. 2022

Coatings

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When mesoporous nanomaterials and graphene oxide have been used in anti-corrosion coatings, new nanocoatings have attracted greater attention. Adding nano-fillers with special structures and corrosion inhibitors to epoxy coatings has been proven to effectively enhance the corrosion resistance of coatings. However, studies have pointed out that the added corrosion inhibitors are easily degraded by UV light and react with the metal substrate or materials in the coating, resulting in a significant reduction in the service life of the coating. To this end, in this study, the corrosion inhibitor was encapsulated in mesoporous silica with pH response, and the functional silica was composited with graphene oxide to prepare novel graphene oxide/functional mesoporous silica nanoparticles. Coatings with this special filler added have strong anti-corrosion potential and can be applied in marine anti-corrosion contexts, such as containers, in the future. The filler not only has a physical barrier ability but also can effectively prevent the degradation of the inhibitor due to ultraviolet rays. At the same time, in the early stage of corrosion, the release of inhibitors can be effectively controlled by the change in PH to achieve the purpose of preventing corrosion. UV spectrophotometry confirmed the stable encapsulation and controlled release of the inhibitor. Electrochemical-impedance spectroscopy showed that the |Z|0.01 Hz value of the smart anti-corrosion epoxy coating was about 10,000 times higher than that of the pure epoxy coating. Through the FT-IR mapping test, it was found that in the area of mechanical damage, the alkaline environment created by the initial corrosion can induce the release of tannic acid and react with common corrosion products to form iron tannins, which effectively inhibits the further occurrence of corrosion. This method provides an effective method for the design of heavy-duty anti-corrosion coatings.

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Section: Synthesis Of Smart Anticorrosive Epoxy Coating Based On Grap...mentioning

confidence: 99%

A Smart Anticorrosive Epoxy Coating Based on Graphene Oxide/Functional Mesoporous Silica Nanoparticles for Controlled Release of Corrosion Inhibitors

Liu

Zhang

et al. 2022

Coatings

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“…In another work, Wang et al developed an epoxy coating on carbon steel, demonstrating the smart sensing feature of 1,10-phenanthroline-5-amine-embedded mesoporous silica nanoparticles . Liu et al demonstrated the smart sensing function of 1,10-phenanthroline-5-amine loaded inside a CaCO 3 microcontainer on a Q235 steel substrate . In another work, Cheng et al demonstrated a smart thermoresponsive polyurethane coating on mild steel by incorporating a multifunctional nanosensor 1,10-phenanthroline-loaded graphene oxide-zeolitic imidazole framework .…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Thymol Blue and Phenolphthalein in Sol–Gel Coatings for Sensing and Inhibiting Corrosion on Mild Steel

Patra,

Santhosh,

Kauveri

et al. 2024

Langmuir

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Development of smart coatings incorporated with corrosion indicators that can warn of corrosion through signaling the alteration of pH or metal-ion concentration at the corrosion site, and simultaneously mitigate further corrosion, stands out as a highly efficient and economical approach to address corrosion issues. In this context, the present work provides a comprehensive comparison on the effectiveness of thymol blue (TB) and phenolphthalein (PhPh) in both sensing and inhibiting corrosion on mild steel. While most of the works primarily focused on independently investigating the corrosion indication behavior of different active agents, our study intends to offer valuable insights through the comparative analysis of TB and PhPh in making well-informed decisions when selecting the most effective indicator for a given set of application scenarios. Initially, TB and PhPh were dissolved in a 3.5% NaCl solution, and their ability to indicate and inhibit corrosion on mild steel was verified through a drop test and an electrochemical study, respectively. An electrochemical study and a salt spray test were carried out to evaluate the corrosion sensing and inhibiting capabilities of the coating produced on a mild steel substrate by integrating TB and PhPh in the sol−gel matrix. The synergistic effect of TB and PhPh in sensing and inhibiting corrosion was also studied by combining TB and PhPh in the sol−gel matrix. It was found that TB-based coatings showed approximately 8 times better inhibiting performance (in terms of charge transfer resistance) when compared to PhPh-based coatings, while the PhPh-based coating was around 16 times more sensitive (with respect to concentration and time) in indicating corrosion when compared to TB-based coatings on a mild steel substrate. Nevertheless, the combination of TB and PhPh in a 1:3 ratio incorporated into the sol−gel coating exhibited increased sensitivity in detecting corrosion and showed improved corrosion inhibition on mild steel.

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“…Organic coatings are one of the most effective technologies to prevent the erosion of the corrosive medium to the metal surface. − Unfortunately, coatings will inevitably be damaged under various conditions of mechanical scrapes, alternation of wetting/drying, and light-induced aging, resulting in the decay of anticorrosive protection. , To increase the service life and decrease the maintenance cost of coatings, the concept of self-repairing coatings has received extensive attention, owing to their ability to release coating adhesives or corrosion inhibitors at the sites of coating damage or metal corrosion. − For instance, Li et al prepared a pH-responsive self-repairing coating by encapsulating benzotriazole (BTA) molecules in mesoporous silica nanofillers, which can rapidly release BTA in response to corrosion-induced pH stimulation, thus achieving the inhibition of corrosion areas. The limited self-repairing ability of the coating is not foolproof; therefore, monitoring the status of coatings is also indispensable for timely manual intervention. − The self-reported coatings can give an early warning of the damaged areas or the occurrence of metal corrosion, which can be achieved by using color or fluorescent indicators in response to metal ions or pH changes. − Su et al synthesized an aggregation-induced emission luminogen with a fluorescence response to pH for the early detection of metal corrosion through a fluorescent “Turn-On” phenomenon . However, few studies are reported on coatings with dual functions of autonomous reporting and repairing.…”

Section: Introductionmentioning

confidence: 99%

pH-Responsive Fluorescent Metal–Organic Framework as a Functional Nanofiller for Smart Coatings

Fan

et al. 2023

Inorg. Chem.

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A zirconium-based UiO-type UiO-66-(OH) 2 metal−organic framework@carbon dot composite (Zr-MOF@ CD) is synthesized through a facile solvent-free thermal method. The Zr-MOF@CD exhibits pH-responsive fluorescence behavior, which emits blue fluorescence for pH < 9 at an emission wavelength of 470 nm. At pH > 9, the fluorescence color turns from blue to yellow, with the emission behavior at 535 nm. Zr-MOF@CDs can serve as functional nanofillers in the epoxy coating for the fabrication of a smart coating, which can realize coating damage warning and metal corrosion reporting. The blue fluorescence can be observed in the area of coating damage with just a minor scratch. Once the scratch is severe enough to expose the metal substrate, the cathodic reaction of oxygen reduction in the corrosion galvanic cell causes an increased pH, where the emission of yellow fluorescence can be identified. The stable fluorescence response is free from the influence of concentration, time, temperature, and the interfering substance. Zr-MOF@CDs can also serve as nanocontainers for loading with the corrosion inhibitor and realizing the repairing of metal corrosion. The development of the smart coating with dual functions of autonomous reporting and repairing holds great potential to improve the lifetime of metals in various industrial applications.

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Smart protective coatings with self‐sensing and active corrosion protection dual functionality from pH-sensitive calcium carbonate microcontainers

Cited by 37 publications

References 65 publications

A Smart Anticorrosive Epoxy Coating Based on Graphene Oxide/Functional Mesoporous Silica Nanoparticles for Controlled Release of Corrosion Inhibitors

A Smart Anticorrosive Epoxy Coating Based on Graphene Oxide/Functional Mesoporous Silica Nanoparticles for Controlled Release of Corrosion Inhibitors

Effectiveness of Thymol Blue and Phenolphthalein in Sol–Gel Coatings for Sensing and Inhibiting Corrosion on Mild Steel

pH-Responsive Fluorescent Metal–Organic Framework as a Functional Nanofiller for Smart Coatings

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