Improving the performance of zinc-rich coatings using conductive pigments and silane

De-ming, Xie; Huang, Kai; Xiao, Feng; Wang, Yuguang

doi:10.1080/1478422x.2020.1759484

Cited by 20 publications

(5 citation statements)

References 48 publications

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“…Based on the salt spray and electrochemical testing results, we determined a possible corrosion-protection mechanism of the influence of conductive additives on zinc-rich primers. It is demonstrated, in this work, that conductive additives can act as a "bridge" to increase the electron transport path between the zinc particles inside the coatings (Figure 9), thus improving the galvanic protection behavior of the coatings and the steel substrate, which is consistent with the results of previously reported research [39,40]. Though the introduction of conductive powders increased the electrical percolation of the modified ZRP coatings in essence, the four conductive powders played different roles within the ZRP.…”

Section: Comparative Study Of the Influence Of Conductive Additives I...supporting

confidence: 92%

Comparative Study of Carbonaceous and Polymer Conductive Additives on Anticorrosion Performance of Epoxy Zinc-Rich Primer

Jin

Zhang

et al. 2022

Coatings

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Zinc-rich primers are among the most promising organic coating systems for improving the corrosion resistance of metals in the marine environment. However, the high zinc content results in poor coating adhesion, high cost, insecurity and pollution. To decrease the zinc dust content, the carbonaceous and polymer conductive additives carbon black (CB), conductive graphite (CG), multiwalled carbon nanotubes (MWCNT) and polyaniline (PANI) were introduced to partially replace the zinc dust in the primers. A comparative study of the anticorrosion performance of epoxy zinc-rich primer (ZRP) is presented herein to systematically discuss and elaborate on the effects of the different conductive additives. There were no blisters, rust or corrosion products presented on the coatings of the CB-modified series due to the good dispersion and conductivity of nanosized CB clusters, while the zinc corrosion products covered the surface of the MWCNT-modified series samples, which was attributed to the excessive electrical conductivity resulting in high consumption of zinc powder. The lamellar CG provided an additional blocking barrier for the coatings based on the maze effect. The transition from the intrinsic state to the doped state of PANI resulted in corrosion protection for the coatings depending on the cathodic and barrier function. The experimental results suggested that the formula with 2 wt.% CB and 67 wt.% zinc dust had the most promising anticorrosion properties, which was also demonstrated by the high Rct and low CPEdl values calculated according to the equivalent electrical circuit analyses.

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Section: Comparative Study Of the Influence Of Conductive Additives I...supporting

confidence: 92%

Comparative Study of Carbonaceous and Polymer Conductive Additives on Anticorrosion Performance of Epoxy Zinc-Rich Primer

Jin

Zhang

et al. 2022

Coatings

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“…After the continuous 300 h immersion test, the Q235 steel plates coated with either neat ZRE or 3DG/ZRE were taken out from the simulated seawater and their XRD patterns were taken to characterize the corrosion products. Consistent with the zinc corrosion products reported previously [36,37], many peaks in the XRD pattern of the soaked neat ZRE sample (Figure 9) could be attributed to ZnO, Zn5(OH)8Cl2H2O, and Zn5(CO3)2(OH)6, respectively. Interestingly, different from the presence of both complicated complex products on the soaked neat ZRE coating, no peak contributed from hydrozincite Zn5(CO3)2(OH)6 could be found on the pattern of the 3DG/ZRE coating after the 300 h immersion test.…”

Section: Corrosion Resistance Of 3dg Modified Zre Coatingssupporting

confidence: 89%

Improving the Corrosion Resistance of Zn-Rich Epoxy Coating with Three-Dimensional Porous Graphene

Qin,

Su,

Bai

et al. 2023

Polymers

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To improve the corrosion inhibition of zinc-rich epoxy (ZRE) composite coatings and shed light on the influence of the spatial structure of graphene fillers on the coatings’ performance, three-dimensional graphene (3DG) and a conventional graphene sheet (G) were used to modify the ZRE composite paint, respectively. The effect of introducing the 2D G fillers on the anti-corrosion behavior of ZRE was studied comprehensively, and its optimal content was determined to be 0.5 wt%. Interestingly, it was found that, comparing with 2D graphene sheets, the corrosion resistance of the ZRE coating could be enhanced more significantly with incorporating even less 3DG. With introducing only 0.1 wt% 3DG, the corrosion current intensity of the resulting 3DG/ZRE coating was reduced to be about 1/10 that of the G/ZRE coating with the same graphene content and 27% of that of the optimized G/ZRE. The corrosion products of the coating were analyzed with the XRD technique. The results indicated that, in contrast to neat ZRE coating, Zn5(CO3)2(OH)6 was absent from the corroded 3DG/ZRE coating, confirming its improved long-term anti-corrosion performance. The porous interconnected framework and high crystallinity of 3DG could contribute to not only its facilely mixing with epoxy resin, but also its effective incorporation into the conductive network of zinc micro-flakes, thus enhancing the corrosion resistance of its ZRE coating at a lower content. The innovative technology to improve the anti-corrosion performance of the ZRE coatings via using the 3D graphene fillers should be capable to be extended to other 2D fillers, such as MXenes.

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“…If there is no electrical contact between the zinc powder particles and the steel, the cathodic and anodic reactions will take place on the same surface of the isolated zinc powder particles. Xie et al [26] further developed Morcillo's theory to explain the relationship between primary corrosion product transport and secondary corrosion product species. The diffusion of Zn 2+ and OH − generated by sacrificial corrosion is long-range diffusion, which easily fills the coating pores and diffuses into the electrolyte.…”

Section: Impedance Spectra Of the Zinc-rich Coating And Its Free Filmmentioning

confidence: 99%

Comparative study of two equivalent circuit models for electrochemical impedance spectroscopy analysis of epoxy zinc-rich coatings

Xie,

Wang,

Xie

et al. 2023

Corrosion Engineering, Science and Technology: The Internationa

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In this paper, the impedance spectra of an epoxy zinc-rich coating (ZRC) and its free film immersed in 3.5% NaCl solution are investigated, the fitting error and model parameter trends of series and nested equivalent circuit fits are compared, and the differences in the high-frequency components of the ZRC and the epoxy coatings are analyzed. The results show that the high-frequency impedance of ZRC is the contact impedance between the zinc powders (Z m ) rather than the film impedance (Z f ). The corrosion reaction of the ZRCs is controlled by the diffusion of oxygen. For ZRCs, the series equivalent circuits are more reasonable compared to the nested equivalent circuit. Based on the series equivalent circuit, the variation law of the equivalent circuit elements (resistors, capacitors and dispersion coefficient) and the correlation of these elements with low-frequency impedance modulus (|Z| 0.01Hz ) and open circuit potential (OCP) are investigated in this paper.

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Improving the performance of zinc-rich coatings using conductive pigments and silane

Cited by 20 publications

References 48 publications

Comparative Study of Carbonaceous and Polymer Conductive Additives on Anticorrosion Performance of Epoxy Zinc-Rich Primer

Comparative Study of Carbonaceous and Polymer Conductive Additives on Anticorrosion Performance of Epoxy Zinc-Rich Primer

Improving the Corrosion Resistance of Zn-Rich Epoxy Coating with Three-Dimensional Porous Graphene

Comparative study of two equivalent circuit models for electrochemical impedance spectroscopy analysis of epoxy zinc-rich coatings

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