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

Abstract

In this study, coating equipment for the effective underwater repair of submerged structures was developed. The tensile bond characteristics of selected epoxy resin coatings were investigated by coating the surface of a specimen using each of the four types of equipment. Using the experimental results, the tensile bond strength and the coating thickness were analyzed according to the type of equipment, coating, and curing time. The results show that the type of coating equipment used had the greatest effect on the measured bond strength and coating thickness of the selected coatings. However, the effect of coating type and curing time on the bond strength and the thickness was observed to be insignificant. Compared with the developed equipment, the surface treatment of the coating was observed to be more effective when using the pre-existing equipment, and thus the bond performance of the coating was improved compared to using the pre-existing equipment. Based on the experimental results, improvements and needs involving the equipment for further research were discussed.

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

“…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.…”

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

“…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.…”

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

“…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].…”

“…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].…”