Early-Age Tensile Bond Characteristics of Epoxy Coatings for Underwater Applications

Kim, Sung-Won; Hong, Hyemin; Han, Taek Hee; Kim, Min Ook

doi:10.3390/coatings9110757

Cited by 13 publications

(18 citation statements)

References 20 publications

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“…It is known that adding a polymeric compound to a cementitious material can improve the material properties such as strength, durability, and interfacial bond between the newly applied material and the existing substrate [1][2][3][4][5][6][7][8][9][10][11][12]. Therefore, incorporating polymers in patch repair cement mortars is common for better repair work of various reinforced concrete (RC) structures, including bridges, dams, high-rise buildings, pavements, and marine concrete structures [13][14][15][16][17][18][19][20][21]. There exist a few representative types of polymers, including acrylate polymers (AC), polyvinyl alcohol (PVA), styrene-butadiene rubber (SBR), and ethylene-vinyl acetate (EVA), all of which are utilized in the repair or surface treatment of RC structures.…”

Section: Introductionmentioning

confidence: 99%

Influence of Polymer Types on the Mechanical Properties of Polymer-Modified Cement Mortars

Kim

2020

Applied Sciences

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This is an experimental study showing the effect of four types of polymers (acrylate polymer (AC), polyvinyl alcohol (PVA), styrene–butadiene rubber (SBR), and ethylene-vinyl acetate (EVA)) on the mechanical properties of polymer-modified cement mortars (PCMs). One polymer dosage was used in this study (3%), and the effect of this dosage on PCMs was compared with a control mortar mix with 0% polymer. The compressive, flexural, and pull-off bond strengths were measured and compared with previous results in works of literature. The effect of polymer addition on improving the mechanical properties of PCMs was clarified, and this effect was more obvious on the flexural strength than that on the compressive strength. The PCMs containing EVA showed the best performance, with up to 33% and 63% increases in compressive and flexural strengths after 28 days, respectively. In comparison, AC, PVA, and SBR produced smaller (16%–46% compared to control) improvements in the flexural strength after 28 days. In general, PCMs containing EVA showed the best mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Influence of Polymer Types on the Mechanical Properties of Polymer-Modified Cement Mortars

Kim

2020

Applied Sciences

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“…At the same time, good interfacial adhesion between the coating and the electrode is necessary for the coating to play a full role. Many studies have been conducted on adhesion changes and methods to improve adhesion [24][25][26]. The coating and substrate are combined due to mechanical bite, physical adsorption with van der Waals force as the prominent role and chemical adsorption with chemical bonds as the leading role.…”

Section: Introductionmentioning

confidence: 99%

Study on Adhesion Reliability and Particle Inhibition of Epoxy Resin Coating in DC GIL after Thermal Ageing Experiment

Wang

Liu

et al. 2022

Coatings

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The movement of metal particles is effectively inhibited when a DC GIL’s (gas-insulated transmission line) electrode is coated. This article aims to study the problem of coating falling off during GIL operation and the change in the particle-inhibitory effect after coating ageing. A closed constant temperature heating platform and a particle motion observation platform in an SF6 atmosphere were built. The epoxy resin coating was aged for 1200 h in an SF6 atmosphere at 160 °C. Pull-off and particle-lifting experiments were carried out for the samples. The experimental results show that the adhesion of the coating changes from rapid decline to slow decline, decreasing by 35.5%. The lifting voltage of particle startup gradually decreased, and the inhibition effect on particle activity decreased from 45.89% to 35.7%. The coating mass loss rate and surface morphology were tested to explain adhesion decline. Then, the dielectric constant, electrical conductivity and adhesion work between the coating and the particles, which are the key factors affecting the lifting of the particles, were measured. Compared with the adhesion work, the dielectric constant of the coating has a greater impact on the starting voltage. The dielectric constant of the coating decreases by 24.07%, and the conductivity increases, which weakens its inhibition of particles. After ageing, due to the decrease in the dielectric constant and the increase in the conductivity of the coating, the inhibition of coating on particles is weakened. This paper reveals the changes in coating adhesion reliability and particle inhibition in DC GIL, providing guidance for using and improving the performance of coatings in practical engineering.

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“…Surface protection of marine and coastal structures is critical, especially for the steel structures since they are suffering from the chloride and sulfate attacks from the seawater [1][2][3][4][5][6][7][8][9][10][11][12]. Corrosion issues always exist for such structures due to the salt present in seawater, and the structural safety may be threatened by attached marine organisms [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Corrosion issues always exist for such structures due to the salt present in seawater, and the structural safety may be threatened by attached marine organisms [1][2][3][4][5]. The systematic repair (e.g., surface coating) is therefore important to save the maintenance cost and guarantee the designed service life of structures [6][7][8][9][10][11][12]. For instance, the installation rate of offshore windfarm structures is expected to increase until 2030 [13], and the maintenance costs for these structures can be as high as 31.3% of the total cost [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Exposure Conditions on the Interfacial Bond Properties of SS400 Plate Coated with Various Epoxy Resins

et al. 2020

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This study aims to investigate the effects of different exposure conditions on the interfacial bond between steel plates and epoxy resin coatings at early ages. Test variables include the epoxy resin types, exposure conditions, exposure periods, and coating equipment. The selected epoxy resins were applied to prepared steel plates and cured at each exposure condition for 7, 28, 56, or 91 days, and the pull-off bond strength and coating thickness were measured. Scanning electron microscopy (SEM) images were obtained to study the interfacial bond for some representative coatings. Three different exposure conditions (indoors and actual marine environment) were considered in this study. This study is also focusing on the improvement of previously developed underwater coating equipment and evaluating the performance. Experiments were conducted to evaluate the performance of the improved equipment types under different environmental conditions: indoors (tap water and seawater) and outdoor conditions. The improved equipment types were confirmed to be effective for underwater coating and easier to use than the previous equipment under real sea conditions. The experimental results also confirmed that the bond strength of the coating decreased as the curing time increased.

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Early-Age Tensile Bond Characteristics of Epoxy Coatings for Underwater Applications

Cited by 13 publications

References 20 publications

Influence of Polymer Types on the Mechanical Properties of Polymer-Modified Cement Mortars

Influence of Polymer Types on the Mechanical Properties of Polymer-Modified Cement Mortars

Study on Adhesion Reliability and Particle Inhibition of Epoxy Resin Coating in DC GIL after Thermal Ageing Experiment

Effect of Exposure Conditions on the Interfacial Bond Properties of SS400 Plate Coated with Various Epoxy Resins

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