43 / 2022-03-27 19:57:18

Study of the anode degradation behavior of various CFRP materials in ICCP system

CFRP,ICCP,Anodic degradation,Structural shape,Resin content

 Carbon Fiber Reinforced Polymer (CFRP) consists of carbon fibers and a resin matrix. Due to its good mechanical properties, electrical conductivity and electrochemical stability, CFRP can be used not only as a reinforcing material for structures, but also as an anode material for impressed current cathodic protection (ICCP) of buildings. In this work, the anodic degradation behavior of CFRP materials with different profile in simulated hole solution of cement and the development process of their mechanical properties were investigated to show the regular variation of resion content with the amount of charges for effective polarization, thus establishing the relevant criteria for the application of different CFRP materials in the ICCP system. The preliminary test results are shown below: first, all CFRP materials with different profiles can show good working stability in the simulated ICCP system, and the drive voltage remains stable under different current densities (in Figure 1a, b, c); secondly, with the prolongation of polarization time and the increase of current density, the degradation behavior of different CFRP materials gradually strengthened, resulting in the color deepening of the electrolyte, which was the result of the dissolution of the surface carbon fibers; thirdly, different structural shapes and resin contents have a significant influence on the mechanical properties of CFRP materials for polarization. For example: the residual tensile strength of the CFRP grid with 3% resin content is 69.01% when the electric charge density for polarization is ~0.7×10⁷ C/m² (in Figure 1d), while the residual tensile strength of the CFRP plate with 25% resin content under the same conditions is 82.43% (in Figure 1e). In summary, the structural shape and resin content of CFRP are key factors for its highly efficient application in the ICCP system as an anode material.