Abstract
Epoxy coating has been proven to protect steel bars from corrosion. However, the damage of epoxy coating is inevitable, and this may lead to more serious corrosion of steel bar. In order to study the corrosion resistance of steel bars with damaged epoxy coating, two groups of coating-damaged bar and one group of coating-intact rebar were designed, and six specimens were made. The influence of electrolyte concentration on the corrosion rate of steel bars was studied by setting different concentrations. After 30 days of accelerated corrosion, electrochemical data were recorded by the electrochemical workstation. The experimental result shows that the steel bars with coating damage have obvious polarization curve characteristics of corrosion, and corrosion resistance decreases obviously. According to the corrosion current and potential, the larger the damaged area of the coating, the faster will be the corrosion rate. According to the polarization curve data, the polarization resistance is modified, and the result is closer to the real polarization resistance value. The calculated corrosion rate shows that the corrosion rate of reinforcement is affected by both electrolyte concentration and coating damage area, and electrolyte concentration has a greater influence on the corrosion rate.
Highlights
As the bridge is gradually extended to the deep sea, the bridge needs to bear more complex loads and will meet more severe durability problems of concrete structures
Additional measures on existing structures can reduce the probability of corrosion, such as coating concrete surfaces, corrosion inhibitors, electrochemical dechlorination, cathodic protection, high corrosion-resistant steel materials, and various coated steel bars
The influence of different damage degrees of epoxy coating on steel bars corrosion was mainly considered
Summary
As the bridge is gradually extended to the deep sea, the bridge needs to bear more complex loads and will meet more severe durability problems of concrete structures. Additional measures on existing structures can reduce the probability of corrosion, such as coating concrete surfaces, corrosion inhibitors, electrochemical dechlorination, cathodic protection, high corrosion-resistant steel materials, and various coated steel bars. Six epoxy-coated rebar specimens were manufactured with different degrees of breakage and placed in NaCl solution to simulate corrosion under the marine environment. The research results of this study could provide theoretical support for the application of epoxy-coated steel bars under the marine environment In this experiment, the influence of different damage degrees of epoxy coating on steel bars corrosion was mainly considered. Due to the protection of concrete and epoxy coating, the corrosion rate of the steel bar under natural conditions is slow. The polarization curves were measured in different time periods, and the corrosion rates of steel bars at the damaged parts of the coating were calculated
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