Chemisorption of polyester coatings on zirconium-based conversion coated multi-metal substrates and their stability in aqueous environment

Fockaert, Laura-Lynn; Pletincx, Sven; Ganzinga-Jurg, Deborah; Boelen, B.; Hauffman, Tom; Terryn, Herman; Mol, J.M.C.

doi:10.1016/j.apsusc.2019.144771

Cited by 29 publications

(27 citation statements)

References 41 publications

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“…The presence of corrosion products in such a short test confirms that the corrosion protection provided by the Zr-based nanocoating is not enough for it to act as a final barrier layer, as the progressive penetration of chlorine ions leads to the barrier destruction and a further layer of organic impermeable coating is urged. Even in conditions where the native oxide layer provides more barrier protection, the zirconium conversion coating use can be seen as an effective solution for the subsequent deposition of organic coatings, as stated previously [6,11,23]. Thus, the ZrO 2 nanocoating effect in the promotion of organic coatings adherence will be discussed in the next section.…”

Section: Porosity and Barrier Properties Of Zr-ead And Zr-ccc Coatings Evaluated By Potentiodynamic Polarization Curves Eis Analysis And mentioning

confidence: 87%

“…Careful inspection of the image shown in Figure 7a reveals that the organic coating is also microcracked, which implies that, not only it loses adhesion after immersion, but also the structural integrity of the epoxy coating as well. Moreover, Zr-EAD/epoxy coating (Figure 7b), in contrast, presents a good adhesion and with no visible microcracking after immersion, indicating that the mechanical performance on service is better than the Bare pre-treatment [23].…”

Section: Scratch Testingmentioning

confidence: 99%

“…They also applied the same strategy to galvanized steel substrates, proving that the Zr-CCC deposition is highly dependent on the solution pH and on the reaction time [20]. Such pre-treatments have demonstrated to improve both the corrosion resistance and the adhesion of top coats and adhesives [9,10,[21][22][23][24]. There are several metals that were approached, such as carbon and galvanized steel [25][26][27], zinc [28], magnesium [29] and aluminum surfaces [13,30,31].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aluminum Protection by Using Green Zirconium Oxide Layer and Organic Coating: An Efficient and Adherent Dual System

et al. 2021

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In this work, the use of ZrO2 nanocoating in aluminum substrates, generated by controlled electrochemical chronoamperometry in hexafluorozirconic acid solutions (H2ZrF6·5H2O), resulted in a lower porous films than that obtained by chemical conversion coating. After the application of an epoxy coating, long-term cyclic immersion corrosion tests and scratch tests proved the superior protection of the dual system and the coating lifespan, thanks to the enhanced adhesion of ZrO2 intermediate layer and the organic coating. As zirconium-based electrolytes are considered more friendly bath if compared to that of other conversion coating processes, like chromating, phosphating or anodizing processes, the study opens new insights to the protection of structural metals in sectors such as automotive, naval and aerospace industries. The main advantages are the employment of lightweight intermediate pre-treatment (nanoscale), compared to conventional ones (microscale), and reduction of waste slurry (electrolyte bath free of additives).

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Section: Porosity and Barrier Properties Of Zr-ead And Zr-ccc Coatings Evaluated By Potentiodynamic Polarization Curves Eis Analysis And mentioning

confidence: 87%

Section: Scratch Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aluminum Protection by Using Green Zirconium Oxide Layer and Organic Coating: An Efficient and Adherent Dual System

et al. 2021

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“…Evidence of an unintended reaction with ambient water is observed as carboxylic acid absorbance at 1720 cm À1 , 46 however the presence of hydrolysis is complicated by an overlapping peak at 1730 cm À1 from the ester chain end. 47 The degree to which unwanted hydrolysis has occurred is thought to be minimal, as there are no carboxylic acid environments observed in either 13 C or 1 H NMR (Figures S15-S27). Therefore, notwithstanding the presence of minor hydrolysis, quantitative thiol loading may be assumed by the elimination of azlactone functionality.…”

Section: Synthetic Strategymentioning

confidence: 99%

Molecular design of polymer coatings capable of photo‐triggered stress relaxation via dynamic covalent bond exchange

Mineo

Buck

Katsumata

2021

Journal of Polymer Science

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Polymer coatings are frequently used to modify surface properties of inorganic substrates. However, the disparity in physical properties between polymer film and substrate often leads to residual stress development, which can be deleterious to the overall performance of coated materials. This work reports the molecular design of polymer films that dissipate stress upon irradiation with ultraviolet (UV) light. These polymers are synthesized by post-polymerization modification of the reactive polymer, poly(2-vinyl-4,4-dimethyl azlactone), to introduce dynamic crosslinks capable of light-initiated addition transfer fragmentation chemistry. Using a custom-built optical cantilever, contrasting film stress responses are observed between films containing dynamic bonds and analogous control films after UV light irradiation, which indicate successful stress relaxation. Further experiments demonstrate the complete relaxation of residual stress in dynamic films after an extended exposure, thereby generating a "stress-free" film. Films fabricated using this approach can be easily tailored to incorporate additional moieties to introduce desired surface properties for future application in a wide array of coatings.

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“…A wide variety of polymers like phenolic resins [2,3], epoxy resins [4][5][6], polyesters [7][8][9], and vinyl esters [10,11] are used in the polymer coating industry. An advantage of using polymers is that their properties can be fine-tuned by proper modifications to suit the respective needs.…”

Section: Introductionmentioning

confidence: 99%

Rheological Studies of Phenolic Resole Resin Incorporated with Modified Graphite Additives

Sekhar

Varghese

2021

Chem Eng & Technol

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An understanding of rheology is vital in polymer processing as it depicts the complex molecular structures, viscoelastic nature, and dynamic mechanical properties of these macromolecules. In this study, graphite powder subjected to different steps of modification like H 2 SO 4 intercalation, silanization, and finally Fe 3 O 4 and BaFe 12 O 19 grafting was used. Changes in viscous behavior were obvious from the flow characteristics and dynamic mechanical properties of the composites. Viscoelastic experiments illustrated the effects of interfacial bonding of polymer and additives on the viscoelastic moduli. Different regression models were applied to the data points, and information regarding regression parameters like the power law exponent and the relaxation time was obtained.

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Chemisorption of polyester coatings on zirconium-based conversion coated multi-metal substrates and their stability in aqueous environment

Cited by 29 publications

References 41 publications

Aluminum Protection by Using Green Zirconium Oxide Layer and Organic Coating: An Efficient and Adherent Dual System

Aluminum Protection by Using Green Zirconium Oxide Layer and Organic Coating: An Efficient and Adherent Dual System

Molecular design of polymer coatings capable of photo‐triggered stress relaxation via dynamic covalent bond exchange

Rheological Studies of Phenolic Resole Resin Incorporated with Modified Graphite Additives

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